Specifications
| Voltage options | 100 V, 200 V, 300 V, 400 V |
|---|---|
| Phase | Single phase,Three phase |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Coolant filter | — | ||||
| Oil | — | ||||
| Spark plug | — |
Service intervals
40| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Oil level | Check | 8 hr | Every 8 hours of engine operation | |
| Change oil | Change | 100 hr | Yearly or 100 hours | |
| Oil cooler | Clean | 100 hr | 20 kW models; Yearly or 100 hours | |
| Air cleaner service | Clean | 150 hr | Yearly or hours shown | |
| Replace filter (oil) | Replace | 200 hr | 14 kW: Yearly or 200 hours; 20 kW: Yearly or 100 hours | |
| Air cleaner service | Replace | 300 hr | Yearly or hours shown; service more frequently under dusty/dirty conditions | |
| Brushes and collector ring | Inspect | 300 hr | Yearly or 300 hours; authorized distributor/dealer only | |
| Spark plugs | Replace | 300 hr | 14 kW: 300; 20 kW: 150 and 300 hours | |
| Crankcase breather hose | Check | 500 hr | Yearly or 500 hours | |
| Replace stepper motor coupling and bushing | Replace | 500 hr | Authorized distributor/dealer only | |
| Wire-cable insulation condition | Test | 500 hr | 3 Years or 500 hours | |
| All external hardware in place, tightened, and not badly worn | Check | 12 mo | Figure 3-9 Yearly (Y) | |
| All internal hardware in place, tightened, and not badly worn | Check | 12 mo | Figure 3-9 Yearly (Y) | |
| Automatic control system | Test | 1 mo | Monthly automatic operation test (Sections 2.4, 5.5). | |
| Automatic operation | Test | 1 mo | Monthly; verify expected sequence of operation during a loaded exercise run or per Section 5.5. | |
| Contactor's external operating mechanism | Clean | 12 mo | Check for cleanliness; clean and relubricate if dirty. Service more frequently if the transfer switch is operated in dusty or dirty areas. Yearly (Y) | |
| Control and power wiring connections | Adjust | 12 mo | Tighten to specifications (see Section 2.5). Yearly (Y) | |
| Control and power wiring connections tightening | Adjust | 12 mo | Tighten to specifications; Figure 3-9 Yearly (Y) | |
| Electrical system | Inspect | 1 mo | Check for signs of overheating or loose connections: discoloration of metal, melted plastic, or a burning odor. Monthly and yearly. | |
| Electrical system connections and contactor - signs of overheating or loose connections (discoloration of metal, melted plastic, burning odor) | Check | 12 mo | Yearly (Y); performed by authorized distributor/dealer | |
| Exterior (vibration, high temperature, contamination, deterioration) | Inspect | 1 mo | Monthly | |
| External hardware | Check | 1 mo | In place, tightened, and not badly worn. Monthly (M) | |
| External hardware (in place, tightened, not badly worn) | Check | 1 mo | Monthly | |
| External operating mechanism cleanliness | Clean | 12 mo | Clean as needed; service more frequently in dusty/dirty areas | |
| External operating mechanism cleanliness (clean as needed) | Clean | 1 mo | Figure 3-9; service more frequently in dusty/dirty areas | |
| General Inspection | Inspect | 12 mo | Annual general inspection | |
| High contact resistance on power circuits | Test | 12 mo | Millivolt drop test; Yearly | |
| Inside of transfer switch | Inspect | 12 mo | Signs of excessive vibration, leakage, high temperature, contamination, or deterioration. Yearly (Y) | |
| Inside of transfer switch (vibration, noise, high temperature, contamination, deterioration) | Inspect | 12 mo | Figure 3-9 Yearly (Y); Section 3.2.2 | |
| Interior (vibration, noise, temperature, contamination, deterioration) | Inspect | 12 mo | Yearly | |
| Internal hardware | Check | 12 mo | In place, tightened, and not badly worn. Yearly (Y) | |
| Internal hardware (in place, tightened, not badly worn) | Check | 12 mo | Yearly | |
| LED indicators, time delays, and remote control systems | Test | 12 mo | Test for operation (Section 5.5). | |
| LED indicators, time delays, remote control systems | Test | 12 mo | Yearly | |
| Main power switching contacts | Check | 12 mo | Clean or replace the main contacts or replace the contactor assembly as necessary. Yearly (Y) | |
| Main power switching contacts | Inspect | 1 mo | Clean or replace the main contacts or replace the transfer switch assembly as necessary. | |
| Main power switching contacts condition | Check | 12 mo | Clean or replace main contacts or replace transfer switch assembly as necessary; Figure 3-9 Yearly (Y) | |
| Main power switching contacts condition | Inspect | 12 mo | Clean or replace contacts or transfer switch assembly as necessary | |
| Main power switching mechanism | Inspect | 1 mo | Check mechanical operation and integrity. | |
| Main power switching mechanism mechanical operation and integrity | Check | 12 mo |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
60| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Spark plug gap | 0.76 | mm (0.030 in.) | |
| Other | Altitude | 0 to 3050 | m (10000 ft.) without derating | |
| Other | Humidity | 5 to 95 | % noncondensing | |
| Other | Load Control Contact Rating | 10 | A @ 250 VAC | |
| Other | Specific gravity, battery fully charged | 1.260 | electrolyte temperature 80 F (26.7 C) | |
| Other | Specific gravity, battery needs charging (below) | 1.215 | electrolyte temperature 80 F (26.7 C) | |
| Pressure | Engine oil pressure | 172-241 | kPa (25-35 psi) | |
| Pressure | Fuel supply pressure, LPG | 1.7-2.7 (7-11) | kPa (in. H2O) | |
| Pressure | Fuel supply pressure, natural gas | 1.2-2.7 (5-11) | kPa (in. H2O) | |
| Resistance | Current transformer burden resistor | 16 | Ohms | GM83929 and GM17250, internal |
| Resistance | Maximum contact resistance, 100--200 Amp | 0.250 | milliohms | |
| Resistance | Maximum contact resistance, 100-200 Amp | 0.250 | milliohms | |
| Resistance | Maximum contact resistance, 300/400 Amp | 0.200 | milliohms | |
| Resistance | Minimum wire insulation resistance | 1.24 | megohms | |
| Resistance | Minimum wire insulation resistance (meggar/hi-pot) | 1.24 | megohms | |
| Resistance | Rectifier diode reverse resistance | at least 100 times the forward resistance | ohmmeter R x 1 scale or diode checker | |
| Resistance | Resistance through the brushes | 0.1-0.2 | ohms | without meter lead resistance |
| Resistance | Rotor resistance, cold (14RCA/L 2F5/2G5) | 5.2 | ohms | cold |
| Resistance | Rotor resistance, cold (20RCA/L 2F7/2G7) | 5.6 | ohms | cold |
| Resistance | Stepper motor coil resistance per half coil | 38.5 | ohms | |
| Resistance | Temperature sensor (OTS) resistance at 100 C (212 F) | 180-200 | ohms | 100 C (212 F) |
| Resistance | Temperature sensor (OTS) resistance at 30 C (86 F) | 2100-2400 | ohms | 30 C (86 F) |
| Resistance | Wire insulation resistance (hi-pot/meggar test) | >1.24 | megohms | max 500 VAC, max 1 second |
| Speed | ATS frequency sensing accuracy | ±2 | % | |
| Speed | Engine crank disconnect speed | 750 | RPM | |
| Speed | Engine run speed (60 Hz) | 3600 | RPM | |
| Speed | Engine start time delay | 3 | seconds | time delay after utility source is lost until engine start cycle begins |
| Speed | Exercise time duration | 20 | min | adjustment range 10-30 min, increment 1 min; factory setting |
| Speed | Frequency regulation, no load to full load | Isochronous | ||
| Speed | Frequency regulation, steady state | ±0.5 | % | |
| Speed | Load Control time delay | 5 | minutes | fixed, not adjustable; allows delayed connection of selected loads |
| Speed | Load control time delay (fixed) | 5 | minutes | not adjustable |
| Speed | Retransfer from Emergency to Normal time delay | 2 | min (120 sec) | adjustment range 1 sec-10 min; factory setting |
| Speed | Source 1/2 Voltage Debounce Delay | 0.5 | s | |
| Speed | Transfer from Normal to Emergency time delay | 3 | sec | adjustment range 1-10 sec, increment 1 sec; factory setting |
| Speed | Transfer, Emergency to Normal time delay | 2 | minutes | after utility source returns until transfer back to normal |
| Speed | Transfer, Normal to Emergency time delay | 3 | seconds | after emergency source becomes available until transfer |
| Speed | Undervoltage dropout time | 0.5 | sec | NA adjustment |
| Temperature | Alternator temperature rise | 130 | °C | Standby |
| Temperature | Exhaust temperature exiting the enclosure at rated kW, dry | 260 (500) | °C (°F) | Rated kW, dry |
| Temperature | Operating temperature | -20 to 70 | °C (-4°F to 158°F) | environmental specification |
| Temperature | Storage temperature | -40 to 85 | °C (-40°F to 185°F) | environmental specification |
| Torque | Alternate internal socket lug torque, #14 to #10 | 60 | in. lb. (5 ft. lb., 6.8 Nm) | |
| Torque | Alternate internal socket lug torque, #2 to 2/0 | 240 | in. lb. (20 ft. lb., 27.1 Nm) | |
| Torque | Alternate internal socket lug torque, #8 to #3 | 120 | in. lb. (10 ft. lb., 13.6 Nm) | |
| Torque | Alternate internal socket lug torque, 3/0 to 350MCM | 300 | in. lb. (25 ft. lb., 33.9 Nm) | |
| Torque | Alternate internal socket lug torque, 400 to 600 MCM | 360 | in. lb. (30 ft. lb., 40.7 Nm) | |
| Torque | Alternate internal socket lug torque, 700 to 1000 MCM | 480 | in. lb. (40 ft. lb., 54.2 Nm) | |
| Torque | Alternator adapter bolts | 69 | Nm (51 ft. lb.) | |
| Torque | Alternator mounting bolts | 14.9 | Nm (11 ft. lb.) | |
| Torque | Alternator thrubolt | 85 | Nm (63 ft. lb.) | |
| Torque | Arc chute hold down screws | 2.8 | Nm | 25 in. lb. |
| Torque | Arc chute holding screws | 2.8 | Nm | 25 in. lb. |
| Torque | Coil assembly M5 screws | 3 | Nm | |
| Torque | Contactor connecting bolts (T/N/E terminals) | 16.3 | Nm (12 ft. lb.) | |
| Torque | Contactor connecting bolts (load/normal/emergency terminals, 3-phase) | 16.3 | Nm | 12 ft. lb. |
| Torque | Contactor connecting bolts (load/normal/emergency) | 16.3 | Nm | 12 ft. lb. |
| Torque | Contactor mounting screws, 100 Amp | 2.4 | Nm | 21 in. lb. |
| Torque | Contactor mounting screws, 150/200 Amp | 2.4 | Nm | 21 in. lb. |
| Torque | Contactor mounting screws, 300/400 Amp | 6.8 | Nm | 60 in. lb. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Engine oil | Kohler Genuine oil | 1.8 L | Oil capacity with filter 1.8 L (1.9 qt.); Kohler recommends Kohler Genuine oil and filters | ||
| Engine oil | 5W-30 or 10W-30 | API Service Class SG, SH, or SJ synthetic oil | 1.8 L | 14 kW models; capacity 1.8 L (1.9 qt.) | |
| Fuel | LP gas or natural gas | Minimum fuel supply pressure NG: 1.2-2.7 kPa (5-11 in. H2O); LP: 1.7-2.7 kPa (7-11 in. H2O) | |||
| Fuel | LPG | Propane 85% min; propene 5.0% max; C4 and higher 2.5% max; sulfur 25 ppm max; lower heating value 84.2 MJ/m3 (2260 Btu/ft3) min | Nominal fuel rating 93 MJ/m3 (2500 Btu/ft3); supply pressure 1.7-2.7 kPa (7-11 in. H2O); conversion factors 8.58 ft3 = 1 lb, 0.535 m3 = 1 kg, 36.39 ft3 = 1 gal | ||
| Fuel | Natural gas | Methane 90% min; ethane 4.0% max; propane 1.0% max; propene 0.1% max; C4 and higher 0.3% max; sulfur 25 ppm max; lower heating value 33.2 MJ/m3 (890 Btu/ft3) min | Nominal fuel rating 37 MJ/m3 (1000 Btu/ft3); supply pressure 1.2-2.7 kPa (5-11 in. H2O); 1/2 NPT fuel supply inlet |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Fault codes
31| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| AC Sens Loss Shutdwn | Loss of AC sensing shutdown | Controller shut down the generator because there was less than 5% of rated voltage measured on Phase A for 3 seconds, only in AUTO. | Shutdown | Check for loose wiring and connections. Check all AC leads. Troubleshoot alternator. |
| AC Sens Loss Warning | Loss of AC sensing warning | Controller measured less than 5% of rated voltage on Phase A for 1 second, 10 seconds after crank disconnect. | Warning | Check for loose wiring and connections. Check all AC leads. Troubleshoot alternator. |
| ATS ComError Warning | ATS communication error | The controller has lost communications with the RXT ATS that had previously been communicating properly. | Warning | Check connections from ATS interface module to generator set; check the power LED on the interface board. |
| ATS Fail Xfr Warning | ATS fail to transfer | The RXT ATS has reported a fail to transfer, the digital output for ATS Fail To Transfer (PIM) is active (contacts closed). | Warning | See the troubleshooting charts in Section 4.6 and Section 4.7. |
| Aux Input Shutdwn | Auxiliary input shutdown | Digital input for a custom shutdown (AuxiliaryInputShutdown - PIM) was activated (low). | Shutdown | Check customer equipment connected to the PIM module. |
| Battery CRLow Warning | Battery cranking low warning | Battery voltage dropped to 11 VDC or less for 30 seconds or more. | Warning | Check engine starting battery. Check battery charger DC output voltage from RDC2. |
| Battery High Warning | Battery high warning | Battery voltage above the high warning setting for 10 seconds or more. | Warning | Check engine starting battery. |
| Battery Low Warning | Battery low warning | Battery voltage below the low warning setting for 90 seconds or more. | Warning | Check engine starting battery. Check battery charger DC output voltage from RDC2. |
| Emerg Pwr On | Emergency Power System Supplying Load | The digital output for EPS Supplying Load (PIM) is active (contacts closed), indicating current output (>5%) from the alternator, only if CTs are installed. | Info | Notice; not a fault. |
| Emerg Stop Shutdwn | Emergency stop shutdown | Optional emergency stop button pressed or emergency stop leads ESS and/or ESN are not connected. | Shutdown | Reset the emergency stop button and clear the fault; check ESS and ESN connections; if no E-stop, connect ESS and ESN together. |
| Engine M/N Invalid Shutdwn | Engine model number invalid shutdown | Generator model number has not been entered. | Shutdown | Enter the generator set model number from the RDC2 keypad, or use SiteTech to select the genset model number. |
| Engine Speed High Shutdwn | Engine speed high shutdown | Engine speed, calculated from AC frequency, was above the high speed setting for 0.3 seconds or more. | Shutdown | Troubleshoot engine operation per the engine service manual. |
| Engine Speed Low Shutdwn | Engine speed low shutdown | Engine speed below the low speed setting for 3 seconds or more after crank disconnect; enclosure thermostat may have tripped. | Shutdown | Troubleshoot engine per engine service manual. Check for high enclosure temperatures and reset the thermostat. |
| Frequency High Shutdwn | Frequency high shutdown | Frequency measured on Phase A exceeded the high frequency setting for 10 seconds, 10 seconds or more after crank disconnect. | Shutdown | Troubleshoot engine operation per the engine service manual. |
| Frequency Low Shutdwn | Frequency low shutdown | Frequency on Phase A was less than the low limit for 10 seconds, or 10 Hz or more less than rated for 60 seconds or more. | Shutdown | Troubleshoot engine per engine service manual. Check for high enclosure temperatures and reset the thermostat. |
| High Lube Oil Temperature Shutdown | High lube oil temperature shutdown | Oil temperature higher than 325 F (163 C). | Shutdown | See Overheats in the troubleshooting charts in Section 5.14. |
| High Lube Oil Temperature Warning | High lube oil temperature warning | Oil temperature higher than 300 F (149 C). | Warning | See Overheats in the troubleshooting charts in Section 5.14. |
| Lo Crank Vlt Warning | Low cranking voltage warning | During cranking, battery voltage measured less than 60% (7.2V or 14.4V) for 6 seconds or more. | Warning | Check cranking battery. |
| Locked Rotor Shutdwn | Locked rotor shutdown | No rotation of the engine or alternator was detected for 3 seconds or more during cranking. | Shutdown | Check cranking circuit. Troubleshoot the engine and alternator. Check alternator connections to controller and auxiliary winding circuit breaker. |
| MainPwrOverL Shutdwn | Main power overload shutdown | Internal current limit circuit tripped, indicating an overcurrent condition on the DC power supply circuit. | Shutdown | Check crank, run, and flash relay circuits for short circuits. |
| NormSrcUnavl | Normal source unavailable (RXT required) | The normal power source (source 1) is disconnected, unavailable, or unacceptable. | Info | Check for utility source power outage. Check wiring and connections to the ATS. |
| NormSrcUnavl (RXT required) | Normal source unavailable | The normal power source (source 1) is disconnected, unavailable or unacceptable. | Info | Check for utility source power outage. Check wiring and connections to the ATS. |
| Not In Auto Warning | Not in auto warning | The RDC2 controller is not in AUTO; generator will not start from an ATS or remote device. | Warning | Press the Auto button to ensure automatic system operation. |
| Oil Pressure Low Shutdwn | Low oil pressure shutdown | The low oil pressure switch was closed for 5 seconds or more; inhibited until 30 seconds after crank disconnect. | Shutdown | Check for oil leaks; check oil level and add oil if low; check oil pressure sensor. |
| Oil Pressure OpenCR Warning | Oil pressure open circuit warning | Oil pressure switch closure has not been detected after shutdown. | Warning | Check the oil pressure switch connection. Test the LOP switch. |
| Over Crank Shutdwn | Overcrank shutdown | The engine did not start during the crank cycle (15 second time delay). | Shutdown | Check the alternator, fuel supply, cranking circuit, cranking battery; troubleshoot engine. |
| RBUS ComError Warning | RBUS communication error warning | The controller has lost communication with an RBUS device that had previously been communicating properly. | Warning | Check connection to the RBUS device. |
| Rmt StartCmd | Remote Start Command Issued | The controller has received a remote start signal while the controller is in AUTO, and will go to normal running. | Info | Verify remote start signal. |
| Spd Sens Flt Shutdwn | Speed sensor fault shutdown | The speed signal was lost; also occurs if the engine stalls. | Shutdown | Check leads 55, 66, F+, and F- between the alternator and the controller; check the engine. |
| Volts L1-L2 (AB) High Shutdwn | Voltage L1-L2 high shutdown | Voltage from Phase A to Phase B exceeded the high limit for longer than the 2 second delay setting. | Shutdown | Troubleshoot alternator. |
| Volts L1-L2 (AB) Low Shutdwn | Voltage L1-L2 low shutdown | Voltage from Phase A to Phase B was greater than 5% of rated but less than the low voltage setting for longer than the 10 second delay; enclosure thermostat may have tripped. | Shutdown | Troubleshoot alternator. Check for high enclosure temperatures and reset the thermostat. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
12Voltage Calibration Using SiteTech adjustment
Tools: Personal computer with Kohler SiteTech software, Digital voltmeter, USB cable
- Measure the voltage across transfer switch lugs NL1 and NL2.
- Check the voltage displayed for Source 1 Voltage L1-L2 in the Source 1 Metering group; compare to the voltmeter.
- If they differ, calculate the new calibration factor: (Vmeter / Vcontrol) x Fold = Fnew.
- In the Source 1 Calibration group, type the new value for Source 1 Calibration Factor Voltage L1-L2 and click Apply Changes.
- Allow a few seconds and compare the voltmeter reading with the controller display.
- For three-phase models, repeat for L2-L3 and L3-L1.
- Start the generator set and repeat for Source 2 using Source 2 Metering and Calibration groups.
Voltage Calibration using RDC2 Menus adjustment
⚠ Hazardous voltage. Only authorized personnel should open the enclosure.
Tools: Digital voltmeter (DVM) with electrically insulated probes
- On the RDC2 controller navigate to the ATS Status menu; press Select and use the down arrow to the Normal Voltage display.
- Measure the voltage across lugs NL1 and NL2 with a digital voltmeter.
- If the controller display does not match, press Select (voltage flashes), use Up/Down to match the voltmeter reading, and press Select to save.
- For 3-phase models, repeat for NL2-NL3 and NL3-NL1.
- Start the generator set.
- Navigate to the Emergency Voltage display and measure across EL1 and EL2; calibrate as in step 3.
- For 3-phase models, repeat for EL2-EL3 and EL3-EL1.
- Press the down arrow to move to the next menu and stop the generator set.
Initial Normal Source Sensing Test diagnostic
⚠ Hazardous voltage. Only authorized personnel should open the enclosure.
Tools: Voltmeter with minimum accuracy of +/-1%
- Connect the normal source and verify that the Normal Source Available LED lights; if not, proceed.
- Check for nominal voltage at the ATS contactor lugs (single-phase across NL1-NL2; three-phase across NL1-NL2, NL2-NL3, NL3-NL1).
- If voltage is present at the lugs, check the interface board LEDs and check for voltage at the interface board connectors (single-phase P13-1 and P13-5; three-phase P1-12 to P1-11, P1-11 to P1-4, P1-4
- If no voltage at the interface board connectors, check the wiring from the contactor to the interface board and repair or replace as needed.
- If the voltage exceeds the pickup voltage, the Utility Available LED on the RDC2 controller should light; if not, check communications wiring.
- For the optional ATS status indicator, verify the Utility Available LED and check the status indicator connection to P12.
- Disconnect the normal source and verify the Utility Available LED turns off within a few seconds.
Millivolt Drop Test Procedure diagnostic
⚠ Testing live electrical circuits. Hazardous voltage or current will cause severe injury or death. Only authorized personnel should open the enclosure.
Tools: Voltmeter, Ammeter
- Apply a balanced load of at least 10% of the switch rating (10 amps or greater gives more accurate results).
- Measure the voltage on both sources from the source lug to the load lug; take several readings.
- Use an ammeter to measure the current flow through the circuit.
- Calculate contact resistance using R = V divided by I (V in millivolts, I in amps, R in milliohms).
- Compare calculated resistance to the table; if significantly higher (2 times or more), disconnect power, check connections and lug torques, and repeat.
- If the second measurement is also too high, replace the contactor.
Separate Excitation Procedure diagnostic
⚠ Hazardous voltage. Operate the generator set only when all guards and electrical enclosures are in place.
Tools: DC ammeter, 10-amp fuse, 12-volt automotive battery
- Disconnect the black FN and FP leads from the alternator at the brush holder terminals.
- Connect a DC ammeter, 10-amp fuse, and a 12-volt automotive battery to the FP and FN brush leads.
- Note and record the ammeter reading.
- Start the engine and check that the ammeter reading remains stable.
- An increasing reading indicates a shorted rotor; a decreasing reading suggests a running open.
- Check for AC output across the stator leads and compare to Section 1 specifications.
- If rotor and stator are good, check the wiring, fuses, and controller settings and connections.
Source Voltage and Frequency Check Procedure diagnostic
⚠ Hazardous voltage. Only authorized personnel should open the enclosure.
⚠ Do not connect or disconnect the controller wiring harness when the power is connected.
Tools: Digital voltmeter (DVM) with electrically insulated probes
- Press the OFF button on the generator set controller and verify the OFF LED.
- Disconnect both power sources from the transfer switch.
- Disconnect the transfer switch contactor wiring harness from P13 (single-phase) or P1 (3-phase) interface board.
- Manually operate the transfer switch to position E.
- Close the utility source circuit breaker and check the utility source voltage to the transfer switch across NL1-NL2, NL1-neutral, and NL2-neutral.
- For three-phase systems, repeat the checks across NL1-NL3 and NL3-NL1.
- Disconnect Source N and manually operate the switch to position N.
- Press RUN to start the generator set and check generator source voltage and frequency at EL1 and EL2.
- If generator output voltage/frequency do not match the nameplate, adjust the generator set.
- Stop the generator set, disconnect both sources, reconnect the wiring harness, close the door, and reconnect both sources.
- Press the AUTO button on the generator set controller.
Wire Insulation Breakdown Test Procedure diagnostic
⚠ Testing live electrical circuits. Hazardous voltage or current will cause severe injury or death.
Tools: Hi-pot tester or meggar
- Disconnect all power sources and the load; disconnect the transfer switch wiring harness from the controller at connector P1.
- Use a hi-pot tester or meggar to check insulation resistance phase-to-phase, phase-to-neutral, and phase-to-ground if isolated.
- For a hi-pot tester, maximum potential is 500 VAC and maximum test time is 1 second.
- Verify that measured insulation resistance exceeds 1.24 megohms.
- If breakdown is indicated or resistance is less than 1.24 megohms, isolate the leakage current and replace faulty components.
12-Lead Generator Reconnection Procedure installation
⚠ Hazardous voltage. Disconnect all power sources before opening the enclosure.
Tools: digital multimeter, voltmeter
- Press the OFF button on the RDC2 controller.
- Disconnect the engine starting battery, negative lead first.
- Disconnect utility power to the generator set.
- Remove the circuit breaker cover and the controller panel to access the alternator leads and CTs.
- Replace the circuit breaker with the correct part for the new voltage rating.
- Select the desired voltage connection and connect the leads per the diagram.
- Reconnect the engine starting battery, negative lead last.
- Check system voltage, frequency, and phase settings and change them if necessary.
- Connect a digital multimeter (DVM) to the generator set output.
- Press RUN to start the generator set.
- Use a voltmeter to check for the correct voltage output; calibrate the RDC2 voltage if necessary.
- Press OFF to stop the generator set.
- Reconnect utility power to the generator set.
- Press AUTO to place the generator set in automatic mode.
Fuel Conversion from Natural Gas to LPG, 14RCA/RCAL installation
⚠ Explosive fuel vapors. Use extreme care when handling, storing, and using fuels.
Tools: straight-blade screwdriver, gas leak detector
- Press the OFF button on the generator set controller.
- Disconnect the utility power to the generator.
- Disconnect the engine starting battery, negative lead first.
- Turn off and disconnect the fuel supply.
- Remove the fuel hose from the hose fitting on the top of the regulator.
- Use a straight-blade screwdriver to remove the NG orifice from the hose fitting.
- Insert the LPG orifice into the hose fitting and tighten until snug.
- Slide the hose onto the fitting and secure with the clamp.
- Disconnect ignition timing leads 65 and N3 for LPG.
- Connect and turn on the new fuel supply.
- Reconnect the engine starting battery leads, negative lead last.
- Reconnect the utility power to the generator.
- Start the generator set by pressing RUN.
- Check for leaks with a gas leak detector, run to check operation, and press OFF.
Installation installation
⚠ Do not use compressed air to clean the switch; it can cause debris to lodge in the components and damage the switch.
⚠ Hazardous voltage: disconnect all power sources before opening the enclosure.
Tools: Shims, Vacuum cleaner
- Check the system voltage and frequency against the transfer switch nameplate before installing.
- Plan the installation using the enclosure dimension (ADV) drawings in Section 6.
- Select a mounting site that complies with local electrical code restrictions for the enclosure type.
- Mount the transfer switch as close to the load and power sources as possible.
- NEMA 3R enclosures: support the front panel while removing the screws, then pull the bottom out and down.
- Wall mounting: mount to a wall or other rigid vertical structure, using shims to plumb the enclosure.
- Cover or remove internal components to protect them from drill chips or debris during installation.
- Tighten the mounting screws to 2.9 Nm (26 in. lb.) when reinstalling the components.
Procedure to Connect an LCM if the Combined Board is Used on the RXT installation
⚠ Hazardous voltage. Disconnect all power sources before opening the enclosure.
⚠ DO NOT connect power relays, HVAC relays, or current transformer to the combined board.
Tools: Basic electrician's hand tools
- Press the OFF button on the generator set controller.
- Disconnect the utility power to the generator set.
- Disconnect the generator set engine starting battery(ies), negative (-) lead first.
- Disconnect power to the transfer switch.
- Remove the ATS enclosure cover and find the combined interface/load management board.
- Move the P11 jumper from terminals 2 and 3 to terminals 1 and 2 to disable load management on the combined board.
- Connect the RBUS communication cable to A, B, PWR, and COM on terminal block P10 on the interface/load management board.
- Follow TT-1574 to connect the LCM: connect LCM RBUS to the combined interface board or generator controller; connect the current transformer (CT) to the LCM (not the combined board); connect power rel
- Install the ATS enclosure cover, check the generator set is OFF, and reconnect utility power to the transfer switch.
- Reconnect the generator set engine starting battery, negative (-) lead last, and reconnect utility power to the generator set.
Air Cleaner Service maintenance
⚠ Do not operate the generator set with the air cleaner removed; a sudden backfire can cause severe injury or death.
- Press the OFF button on the generator set controller.
- Disconnect the utility power to the generator set.
- Disconnect the generator set engine starting battery, negative lead first.
- Loosen the cover retaining knob(s) and remove the cover.
- Remove the element cover nut, element cover, and the paper element.
- Do not wash the paper element or clean it with pressurized air.
- Replace the element if it is dirty, bent, or damaged.
- Check the air cleaner base and element cover; replace damaged components.
- Reinstall the paper element, element cover, nut, and cover; secure the cover.
- Reconnect the utility power to the generator set.
- Reconnect the engine starting battery, negative lead last.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Voltage reconnection
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| P10 (RBUS communication) on controller interface board | P10-1 A Communication Line; P10-2 B Communication Line; P10-3 PWR 12 VDC; P10-4 COM 12 VDC | 20 AWG shielded twisted-pair, Belden 9402 or equivalent; 12--14 AWG wire for PWR and COM for long runs. | ||
| P10-1 | A | Communication Line; 20 AWG shielded twisted-pair, Belden 9402 or equivalent | ||
| P10-1 (A) | 20 AWG shielded twisted-pair, Belden 9402, 8723, or equivalent | Communication Line, ATS interface board to RDC2/DC2 generator set controller | ||
| P10-2 | B | Communication Line; 20 AWG shielded twisted-pair, Belden 9402 or equivalent | ||
| P10-2 (B) | 20 AWG shielded twisted-pair, Belden 9402, 8723, or equivalent | Communication Line | ||
| P10-3 | PWR | 12 VDC; 20 AWG shielded twisted-pair Belden 9402 or 12-14 AWG wire | ||
| P10-3 (PWR) | 20 AWG shielded twisted-pair Belden 9402, or 12-14 AWG wire | 12 VDC | ||
| P10-4 | COM | 12 VDC; 20 AWG shielded twisted-pair Belden 9402 or 12-14 AWG wire | ||
| P10-4 (COM) | 20 AWG shielded twisted-pair Belden 9402, or 12-14 AWG wire | 12 VDC | ||
| P11 (Load control) on standard interface board only | P11-1 / P11-2 LOAD Load Control | Contact rating 10 A @ 250 VAC; wire size #12--18 AWG. Not present on combined interface/load management board. | ||
| P11-1 | A | Load Control connection on standard interface board only; contact rating 10 A @ 250 VAC; wire size #12-18 AWG | ||
| P11-1 (LC1) | #12-18 AWG | Load Control Output, 10 A @ 250 VAC, 1 A @ 30 VDC | ||
| P11-2 | B | Load Control connection on standard interface board only; contact rating 10 A @ 250 VAC; wire size #12-18 AWG | ||
| P11-2 (LC2) | #12-18 AWG | Load Control Output | ||
| RBUS module connections to generator set terminal block TB1 | A, B, PWR, COM | Connect one end of each cable shield to GROUND at the generator set; leave the end of each cable shield disconnected at the last device. | ||
| 1 | Single-phase leads 1-2, 3-4 | 1, 2, 3, 4 | 4-lead generator sets are not reconnectable | |
| 1 | Standard (100A) | (1) #14 - 1/0 AWG | Normal and Emergency Load | |
| 1 | Standard (200A) | (1) #6 AWG - 250 MCM | Normal and Emergency Load | |
| 1 | Standard (400A) | (2) #6 - 250 MCM | Normal and Emergency Load (Emerg: (2) #6 - 250 MCM) | |
| 3 | Standard (200A) | (1) #6 AWG - 250 MCM | Normal and Emergency Load | |
| 3 | Standard (400A) | (1) #6 AWG - 250 MCM | Normal and Emergency Load | |
| 3 | Three-phase leads 1-4, 2-5, 3-6, 7-10, 8-11, 9-12 | 1-12 | 12-lead generator sets are reconnectable to voltages shown on the generator set specification sheet | |
| single-phase | Emergency source voltage sensing (single-phase) | P13-3 and P13-7 | Interface board connector P13 | |
| single-phase | Normal source voltage sensing (single-phase) | P13-1 and P13-5 | Interface board connector; check nominal voltage and LED1 normal source available | |
| three-phase | Emergency source voltage sensing (three-phase) | P1-7 and P1-18, P1-6 and P1-7, P1-6 and P1-18 | Interface board connector P1 | |
| three-phase | Normal source voltage sensing (three-phase) | P1-12 to P1-11, P1-11 to P1-4, P1-4 to P1-12 | Interface board connector P1 | |
| 120/208 | 3 | Wye | Voltage configuration (Figure 4-12) | |
| 120/240 | 1 | 2-pole, 3-wire, solid neutral | #14 - 1/0 AWG | 100 amp standard model |
| 120/240 | 1 | Single | Voltage configuration (Figure 4-12) | |
| 120/240 | 3 | Delta | Voltage configuration (Figure 4-12) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What voltage does the Kohler RXT produce?
The Kohler RXT is offered in 100 V, 200 V, 300 V, 400 V, Single phase,Three phase-phase.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| ATS ComError Warning (ATS communication error) — Warning | The controller has lost communications with the RXT ATS that had previously been communicating properly. | Check connections from ATS interface module to generator set; Check the power LED on the interface board; See Section 5.1. |
| ATS Fail Xfr Warning (ATS fail to transfer) — Warning | The RXT ATS has reported a fail to transfer, the digital output for ATS Fail To Transfer (PIM) is active (contacts closed). | See the troubleshooting charts in Section 4.6; Also see Section 4.7. |
| Emerg Pwr On (Emergency Power System Supplying Load) — Notice | The digital output for EPS Supplying Load (PIM) is active (contacts closed), indicating there is current output (>5%) from the alternator, only if CTs are installed. | |
| NormSrcUnavl (RXT required) — Notice | The normal power source (source1) is disconnected, unavailable or unacceptable. | Check for utility source power outage; Check wiring and connections to the ATS. |
| Rmt StartCmd (Remote Start Command Issued) — Notice | The controller has received a remote start signal while the controller is in AUTO, and will go to normal running. | Verify remote start signal. |
| RXT not responding | Power LED not steady ON; Online LED not steady ON; Online LED blinking faster than once/second; RXT not shown on SiteTech/OnCue; Number of errors and timeouts not steady; RXT ID changes over time | Check ATS status in the RDC2 controller menu; Verify that only one RXT is connected; Check communication A & B connections at the RXT interface board and genset connection terminal block; Verify correct version of PC software is installed; Ensure the cable runs from genset to RXT are within specifications (cable size and length); If problems persist, contact the Kohler Generator Service Department. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Kohler RXT troubleshooting guide (115 entries) →
Repair guides
44- 100/200 Amp 3-Phase Microswitch Replacement Procedure
- 12-Lead Generator Reconnection Procedure
- Air Cleaner Service
- Arc Chute Replacement
- Arc Chute Replacement (100-400 Amp 3-Phase)
- Arc Chute Replacement Procedure
- Automatic Operation Test
- Circuit Board Replacement Procedure
- Contactor Assembly Installation (Single-Phase Models)
- Contactor Assembly Removal (Single-Phase Models)
- Contactor Assembly Removal and Installation (Single-Phase)
- Contactor Replacement Procedure (Three-Phase Models)
- Contactor Replacement Procedure (Three-Phase)
- Controller Interface Board Replacement
- Fuel Conversion from Natural Gas to LPG, 14RCA/RCAL
- Initial Normal Source Sensing Test
- Manual Operation (100-200 Amp Switches)
- Manual Operation Procedure
- Manual Operation Procedure 1
- Manual Operation Procedure 1
Step-by-step procedures compiled from the Kohler service manual for this model.
Parts
86| Part # | Description | Qty | System | |
|---|---|---|---|---|
| GM20990 | Gasket | 4 | Gasket | Amazon eBay |
| P10-4 | Brushes | Brushes | Amazon Amazon eBay eBay | |
| 082S270538-3 | Lamp/LED bulb - INSTRUMENT CLUSTER: GAUGE BACK LIGHT | 1 | Service part / kit | Amazon eBay |
| 082S272109-2 | Lamp/LED bulb - INSTRUMENT CLUSTER: LEFT TURN SIGNAL LED (GREEN) | 1 | Service part / kit | Amazon eBay |
| 082S272109-3 | Lamp/LED bulb - INSTRUMENT CLUSTER: GAUGE WARNING LED (RED) | 1 | Service part / kit | Amazon eBay |
| 082S272109-4 | Lamp/LED bulb - INSTRUMENT CLUSTER: RANGE INHIBIT LED (YELLOW) | 1 | Service part / kit | Amazon eBay |
| 082S272109-5 | Lamp/LED bulb - INSTRUMENT CLUSTER: HIGH BEAM ICON LED (BLUE) | 1 | Service part / kit | Amazon eBay |
| 297712 | Lug, Terminal | 3 | Service part / kit | Amazon eBay |
| 362081 | Contacts, auxiliary | 1 | Service part / kit | eBay $59.99 |
| 362084 | Arc Chutes | 1 | Service part / kit | eBay |
| 362087 | Solenoid | 1 | Service part / kit | eBay $350.00 |
| 362090 | Solenoid | 1 | Service part / kit | eBay |
| 362135 | Solenoid | 1 | Service part / kit | eBay |
| G11-123 | Status indicator kit with LED indicators | 1 | Service part / kit | eBay |
| G11-124 | Load shed kit with HVAC relays and pilot relays | 1 | Service part / kit | eBay |
| GE1156 | Lamp/LED bulb - BACK-UP LIGHTS (32 candlepower) | 1 | Service part / kit | Amazon eBay |
| GE168 | Lamp/LED bulb - COURTESY LIGHT (3 candlepower) | 1 | Service part / kit | Amazon eBay |
| GE193 | Lamp/LED bulb - CLEARANCE & IDENTIFICATION (3 candlepower) | 1 | Service part / kit | Amazon eBay |
| GE561 | Lamp/LED bulb - DOME LIGHTS (12 candlepower) | 1 | Service part / kit | Amazon eBay |
| GE9007 | Lamp/LED bulb - HEAD LIGHTS: LOW BEAMS (65 watts) | 1 | Service part / kit | Amazon eBay |
| GM102261 | Assy, Solenoid - 200A/240V (Motor) | 1 | Service part / kit | eBay |
| GM102262 | Contact, Auxiliary | 2 | Service part / kit | eBay |
| GM102263 | Lug Kit - 100A (3/Kit) | 2 | Service part / kit | eBay |
| GM102264 | Lug Kit - 200A (3/Kit) | 2 | Service part / kit | eBay |
| GM102266 | Harness - 240V | 1 | Service part / kit | eBay |
| GM102267 | Cover - 100A | 1 | Service part / kit | eBay |
| GM102268 | Cover - 200A | 1 | Service part / kit | eBay |
| GM102288 | Lug Kit - 200A, SE Bus (2/Kit) | 1 | Service part / kit | eBay |
| GM102299 | Assy, Solenoid - 100A/240V (Motor) | 1 | Service part / kit | eBay |
| GM25434 | Switch, coil cutout / Contacts, auxiliary | 1 | Service part / kit | eBay |
| GM28412 | Lug, terminal | 6 | Service part / kit | eBay |
| GM29867 | Limit Switch | 2 | Service part / kit | eBay |
| GM31593 | Terminal, ATS lug sensing | 4 | Service part / kit | eBay |
| GM32387 | Plunger and link, solenoid | 1 | Service part / kit | eBay |
| GM32388 | Rectifier | 1 | Service part / kit | eBay |
| GM32390 | Solenoid | 1 | Service part / kit | eBay |
| GM32392 | Solenoid | 1 | Service part / kit | eBay |
| GM39145 | Arc chute assembly | 1 | Service part / kit | eBay |
| GM41995 | Contactor harness | 1 | Service part / kit | eBay |
| GM51138 | Lugs, cable connection | 1 | Service part / kit | eBay |
| GM77077 | Power Terminal Cover | 1 | Service part / kit | eBay |
| GM77176 | Relay | 4 | Service part / kit | Amazon eBay |
| GM77177-1 | Decal, CSA | 1 | Service part / kit | Amazon eBay |
| GM77178 | Cover w/ Decals, Load Shed | 1 | Service part / kit | Amazon eBay |
| GM78649 | Membrane Status Indicator | 1 | Service part / kit | Amazon eBay |
| GM79580 | PCB Assy, RXT 1-Phase ATS Interface | 1 | Service part / kit | eBay $350.00 |
| GM80079 | PCB Assy, RXT 3-Phase ATS Interface | 1 | Service part / kit | eBay $750.00 |
| GM80139 | Contactor Assembly, 400 Amp 2-pole | Service part / kit | Amazon eBay | |
| GM80140 | Contactor Assembly, 400 Amp 3-pole 240V | Service part / kit | eBay | |
| GM80547 | Contactor Assembly, 100 Amp 2-pole | Service part / kit | eBay $599.95 | |
| GM80549 | Contactor Assembly, 150/200 Amp 2-pole | Service part / kit | eBay $340.00 | |
| GM80551 | Contactor Assembly, 300/400 Amp 2-pole ASE | Service part / kit | eBay $330.00 | |
| GM80778-S | Contactor Harness | 1 | Service part / kit | eBay |
| GM80779 | Contactor Harness | 1 | Service part / kit | eBay |
| GM80780 | Contactor Harness | 1 | Service part / kit | eBay |
| GM80879 | Decal, Wiring Diagram | 1 | Service part / kit | Amazon eBay |
| GM80950 | Decal, Warning | 2 | Service part / kit | Amazon eBay |
| GM81111 | Contactor Assembly, 400 Amp 3-pole 208V | Service part / kit | eBay $2500.00 | |
| GM81372-1 | PCB Assy, RDC2 Load Control | 1 | Service part / kit | Amazon eBay $225.00 |
| GM83720 | Rectifier | 1 | Service part / kit | eBay |
| GM83929 | Transformer, Current (CT) | 1 | Service part / kit | Amazon eBay |
| GM84872 | Solenoid Coil (240V) | 1 | Service part / kit | eBay |
| GM84873 | Solenoid Coil (240V) | 1 | Service part / kit | eBay |
| GM84874 | Solenoid Coil (240V) | 1 | Service part / kit | eBay |
| GM84875 | Solenoid Coil (240V) | 1 | Service part / kit | eBay |
| GM84876 | Solenoid Coil (240V) | 1 | Service part / kit | eBay $119.00 |
| GM84877 | Solenoid Coil (240V) | 1 | Service part / kit | eBay |
| GM84878 | Solenoid Coil (240V) | 1 | Service part / kit | eBay |
| GM84880 | Solenoid | 1 | Service part / kit | eBay |
| GM84881 | Solenoid Coil | 1 | Service part / kit | eBay |
| GM84882 | Solenoid Coil | 1 | Service part / kit | eBay |
| GM84883 | Handle, Manual | 1 | Service part / kit | eBay |
| GM84884 | Arc Chutes | 1 | Service part / kit | eBay |
| GM84885 | Handle | 1 | Service part / kit | eBay |
| GM84886 | Harness, wiring | 1 | Service part / kit | eBay |
| GM85087-2 | Neutral, 100-200A (Sub-Assembled) | 1 | Service part / kit | eBay |
| GM85087-3 | Neutral, 100-200A SE (Sub-Assembled) | 1 | Service part / kit | eBay |
| GM88281-1 | Load Control, ATS | 1 | Service part / kit | Amazon eBay |
| GM88557 | Harness, Communications | Service part / kit | eBay | |
| GM90763 | Membrane, Switch/LED, RXT/LCM Combo | 1 | Service part / kit | Amazon eBay |
| GM90773 | PCB Assy, RXT/LCM Combo | 1 | Service part / kit | eBay $395.00 |
| GM93969-KP1-QS | RXT Interface/Load Shed PCBA | Service part / kit | eBay | |
| P10-1 | Voltage Regulator PowerBoost™ V | Service part / kit | Amazon Amazon eBay eBay FridayParts $117.99 | |
| P10-2 | Stator | Service part / kit | Amazon Amazon eBay eBay | |
| P10-3 | communication cable connector | Service part / kit | Amazon Amazon Amazon eBay eBay eBay KuduParts $29.00 | |
| VH550 | Lamp/LED bulb - FOG LIGHTS (55 candlepower) | 1 | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 100% | 1.7 | 59.0 |
| Standby | 100% | 3.9 | 136.0 |
Available documents
Spec sheet — kohler-egd-14rcal-200sels-kit-specification-sheets (Kohler)Reference (Kohler)Reference — TP-6753 0914D (Kohler)Reference — adv8487 (Kohler)Reference — adv8736 (Kohler)Reference — adv9755 (Kohler)Reference — g11152 (Kohler)Reference — tp6753 (Kohler)Reference — tt1585 (Kohler)Service manual (Kohler)Service manual — 2a9cc7 (Kohler)Service manual — 50adb3b2-603c-4040-9f0d-b6f22f56a9fd (Kohler)Service manual — TP-6808 1218C (Kohler)Service manual — TP-7091 (Kohler)Service manual — adv9187 (Kohler)Service manual — gm80666 (Kohler)Service manual — gm80676 (Kohler)Service manual — tp6807 (Kohler)Service manual — tp6807fr (Kohler)Service manual — tp6808 (Kohler)Service manual — tp6984 (Kohler)Service manual — tt1609 (Kohler)Service manual — tt1646 (Kohler)
This page was generated from the 23 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.