Kohler RXT troubleshooting: 5 fault codes and 110 symptom-cause-remedy entries from the manufacturer's own service documentation.
Kohler RXT — full specs, parts & maintenance.
| Code | Meaning | 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 (source 1) 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 master switch is in AUTO, and will go to normal running | Verify remote start signal |
| 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. |
| Power LED is not lit | Voltage between PWR and COM at the generator set is not between 10 and 16 VDC; Voltage is low but not zero; Voltage is zero | Check for 10-16 VDC at the PWR and COM connections on the generator set; Check the cable size and length to verify they are within the range shown in the installation manual; Check the wire run from generator set to RXT; Check voltage to the controller (see controller troubleshooting information and wiring diagrams in the generator set service manual); Check connections from controller to customer connections on generator set; Check power connections at the RXT interface board, genset connection terminal block, and starting battery. |
| RXT functions correctly only after cycling power | More than three (3) RBUS modules connected; RBUS module serial numbers not different; USB cable connected to generator controller during power cycles; Modules not seen by SiteTech after individual connection sequence | Disconnect RBUS modules and verify that SiteTech/OnCue shows no modules connected; Verify that no more than three (3) RBUS modules are connected; Verify that each RBUS module serial number is different; Verify that the USB cable is not connected to generator controller during power cycles; Verify that all modules are seen by SiteTech after individual connection sequence; If problems persist, contact the Kohler Generator Service Department. |
| ATS Source shows Remote (no RXT detected) | No Model RXT transfer switch is detected; a different model of transfer switch is connected (through engine start leads 3 and 4 to the generator set) or no transfer switch is connected to the generator set. | Check the RBUS connections from the generator controller to the RXT interface board. |
| ATS Status and Configuration menus are not displayed on the RDC2 controller | RBUS connections from the RDC2 controller on the generator to the interface board on the RXT transfer switch are loose or open. | Check the RBUS connections from the RDC2 controller on the generator to the interface board on the RXT transfer switch. |
| Transfer switch and other accessories will not operate | On RXT transfer switches shipped from January 2012 to March 2012, the labels on the T-shaped green terminal block (GM84150) for RBUS connections were reversed. | Connect the wiring according to the labels on the interface board for correct operation. |
| ATS fails to operate and no LEDs are lit | No power to the transfer switch/controller. | Close circuit breakers leading from power sources to the transfer switch. Troubleshoot power to the system. See Section 4.2. |
| Generator set does not start when the normal source fails | Generator set is OFF or the batteries are not charged or connected. | Press the AUTO button on the generator set controller. Check that the generator set batteries are charged and connected. |
| Generator set does not start when the normal source fails | Generator set is malfunctioning. | See the generator set operation or service manual. |
| Generator set does not start with the exerciser (Also see Figure 4-18) | Exercise settings incorrect. | Check the exerciser settings. See generator set Installation Manual. |
| Generator set does not start with the exerciser (Also see Figure 4-18) | Generator set is OFF or the batteries are not charged or connected. | Press the AUTO button on the generator set controller. Check that the generator set batteries are charged and connected. |
| Generator set does not start with the exerciser (Also see Figure 4-18) | Generator set is malfunctioning. | See the generator set operation or service manual. |
| Generator set does not shut down (Also see Figure 4-20) | Generator set is in the RUN mode. | Press the AUTO button on the generator set controller. |
| Generator set does not shut down (Also see Figure 4-20) | The exerciser is operating. | Wait for the exercise period to end. |
| Generator set does not shut down (Also see Figure 4-20) | Engine cooldown is operating. (after retransferring the load to the normal source) | Wait for the generator set to stop after the engine cooldown time delay expires or the engine cools down. |
| Generator set does not shut down (Also see Figure 4-20) | Generator set is malfunctioning. | See the generator set operation or service manual. |
| ATS fails to transfer the load to the emergency source after the generator set starts (Also see Figure 4-19) | Generator set circuit breaker is open. | Close circuit breakers leading from the generator set to the ATS. |
| ATS fails to transfer the load to the emergency source after the generator set starts (Also see Figure 4-19) | The normal-to-emergency transfer time delay is operating. | Check operation. Enough time must pass for the normal-to-emergency time delay to expire. |
| ATS fails to transfer the load to the emergency source after the generator set starts (Also see Figure 4-19) | Generator voltage is out of range or emergency source sensing circuits are malfunctioning. | Check the emergency source voltage. Repair or adjust generator set if the output voltage is out of range, otherwise see Section 5.4. Check the voltage calibration on the RDC2 controller. See Section 5.2.2. Check voltage pickup and dropout settings. |
| ATS fails to transfer the load to the emergency source after the generator set starts (Also see Figure 4-19) | Transfer switch operation problems. | See Section 4.7, Transfer Switch Troubleshooting. |
| ATS fails to retransfer the load to the normal source after the normal source returns (Also see Figure 4-19) | Normal source circuit breaker is open. | Close circuit breakers leading from the normal source to the transfer switch. |
| ATS fails to retransfer the load to the normal source after the normal source returns (Also see Figure 4-19) | Emergency-to-normal retransfer time delay has not timed out. | Check time delay settings. See Section 5.5. |
| ATS fails to retransfer the load to the normal source after the normal source returns (Also see Figure 4-19) | Normal source voltage levels are out of range. | Check the normal source voltage. See Section 4.2. Check the voltage calibration on the RDC2 controller. See Section 5.2.2. Check voltage pickup and dropout settings. |
| ATS fails to retransfer the load to the normal source after the normal source returns (Also see Figure 4-19) | Normal source sensing circuits are malfunctioning. | See Section 5.3, Normal Source Sensing. |
| ATS fails to retransfer the load to the normal source after the normal source returns (Also see Figure 4-19) | Transfer switch operation problems. | See Section 4.7, Transfer Switch Troubleshooting. |
| Transfer switch mechanism is binding | Debris is in the transfer switch mechanism. | Clean the transfer switch assembly. See Section 3.2.2. |
| Transfer switch mechanism is binding | Transfer switch mechanism is damaged. | Replace the transfer switch assembly. See Section 7.4. |
| ATS operates erratically or operates out of specifications | Power supply problems/loose connection. | Check wiring for loose connections especially those that supply power to the controller or in the affected circuit. Check the power supply. See Section 4.2. |
| ATS operates erratically or operates out of specifications | Incorrect transfer switch controller operation/calibration. | See Section 5.5 for problems related to time delays in the operating sequence. Check the voltage calibration on the RDC2 controller. See Section 5.2.2. For problems related to dropout and pickup specifications see Section 5.3 for the normal source or Section 5.4 for the emergency source. |
| Source available LED off when Source is available | Controller does not recognize an available source. | Check switches, circuit breakers for open circuit. Check source connections to the ATS. Check connections from interface board to generator set controller. Check source voltage and compare to source pickup and dropout levels. See Sections 5.3 and 5.4. Check source sensing. See Sections 5.3 and 5.4. Check the voltage calibration on the RDC2 controller. See Section 5.2.2. |
| Source available LED off when Source is available | Malfunctioning LED. | If no LEDs light, troubleshoot power and connections to the controller. |
| Position LED not lit | Position microswitch malfunction. (3-phase only) | Check the operation of the position microswitches. See Section 5.7. |
| Position LED not lit | Transfer switch in intermediate position. | Manually operate the transfer switch and check the position LED operation. See Section 2.8. Check for evidence of solenoid coil damage. Replace the solenoid assembly if necessary. See the Table of Contents to locate solenoid assembly replacement procedures for your model transfer switch. Check the connections from the ATS interface board to the generator set controller. |
| Position LED not lit | LEDs not functioning. | If no LEDs light, troubleshoot power and connections to the controller. |
| Exerciser does not operate when expected (Also see Figure 4-18) | The exercise setting on the RDC2/DC2 controller has been cleared. | Set the exerciser for the desired time and day. See the generator set operation manual for instructions. |
| Exerciser does not operate when expected (Also see Figure 4-18) | Generator set malfunction. | Troubleshoot the generator set. See the generator set service manuals. |
| Exerciser does not start or stop the generator set engine | Generator set controller is not in AUTO mode (AUTO LED not on). | Press the AUTO button on the RDC2/DC2 controller. |
| Exerciser does not start or stop the generator set engine | Generator set does not start and run when RUN button is pressed. | Troubleshoot the generator set. See the generator set and engine service manuals. |
| Exerciser does not start or stop the generator set engine | Engine cooldown is operating (controller display indicates engine cooldown). | Wait for engine cooldown time delay to expire. |
| Exerciser does not start or stop the generator set engine | Utility source available LED on the RDC2 controller or optional ATS status indicator is not illuminated. | Exerciser will not transfer the load or stop the engine if the utility source is not available. Check source circuit breakers and see Sections 4.2 and 5.3. |
| ATS does not transfer the load | Generator set is running during a scheduled exercise and the controller is not programmed for a loaded exercise. | Set the exercise mode on the RDC2 or DC2 controller to loaded. See the generator set operation manual for instructions. |
| ATS does not transfer the load | Transfer switch mechanism binds or does not operate smoothly when manually operated. | Clean and/or service the ATS mechanism. See Section 4.7. |
| ATS does not transfer the load | Source voltage is not within the acceptable range compared to pickup and dropout settings. | Normal source: wait for the utility source to return and stabilize. Emergency source: Adjust/service the generator set. See the generator set instruction manuals. |
| ATS does not transfer the load | Source circuit breakers/switches are not closed. | Close the source circuit breakers/switches. |
| ATS does not transfer the load | Transfer to emergency or retransfer to normal time delay has not expired. | Wait for time delays to expire. |
| ATS does not transfer the load | Source-sensing wiring or operation problem. | Check source-sensing wiring and operation. See Section 5.3 or 5.4. |
| ATS does not transfer the load | Source connection LED on the RDC2 controller does not agree with the actual transfer switch position. | Check the ATS interface board connection to the generator set controller. 3-phase only: Check the position-indicating microswitch wiring and operation. See Section 5.7. |
| ATS does not transfer the load | Solenoid coil voltage or coil-operation control switches (400 amp switches) problem. | Check voltage to the solenoid coil(s). Also check coil-operation control switches on 400 amp switches. See Section 5.8. |
| Generator set continues to run after transfer to normal source or exercise period expires | Engine cooldown time delay has not expired. | Wait for engine cooldown time delay to expire. See the generator set operation manual. |
| Generator set continues to run after transfer to normal source or exercise period expires | Generator set controller is not in AUTO mode. | Press the AUTO button on the generator set controller. |
| Generator set continues to run after transfer to normal source or exercise period expires | Utility source is not available (ATS will not transfer if it does not see an acceptable source). | Check utility source voltage and source sensing. See Sections 4.2 and 5.3. |
| Generator set continues to run after transfer to normal source or exercise period expires | Generator set malfunction. | Troubleshoot the generator set. See the generator set service manuals. |
| Load shed AC relays do not activate | Verify 120 VAC supply voltage to relays. Verify correct wiring to the load shed kit or combined interface/load management board and AC relays. | |
| Metering always reads 0% under load | Verify that the Emergency feed to the ATS goes through the CT correctly. See Figure 4-22. Verify the CT leads are connected to the load shed kit or combined interface/load management board input correctly. See Figure 4-23 or the wiring diagrams in Section 6. Verify that the correct CT is used. (400 A to 3V) | |
| Metering never reads 0% | Verify that the CT is wired correctly. Verify that twisted-pair cable was used. Verify that CT wiring is in separate conduit from AC leads. | |
| HVAC units do not shed | Verify normally closed (NC) output is used to control AC relays. | |
| Does not shed when load is between 85% and 90% | Verify that the load is not intermittently dropping below 85%. Verify that the load remains above 90% for at least 40 seconds. Verify that the % load is metering correctly. Verify that the overload percent is set at 10% or more below indicated level. Verify that the load shed kit or combined interface/load management board is communicating with the generator set controller. | |
| Does not shed when load is at 100% | Verify that the % load is steady at 100% for approximately 25 seconds. Verify that the % load is metering correctly. Verify that the overload percent is set at 10% or more below indicated level. Verify that the load shed kit or combined interface/load management board is communicating with the generator set controller. | |
| Does not shed when load is greater than 110% | Wait at least 15 seconds. Verify that frequency is greater than 59 Hz. Verify that the load shed kit or combined interface/load management board is communicating with the generator set controller. | |
| Generator still overloaded when all loads are shed | Verify that only non-essential load are connected through the load shed kit or combined interface/load management board. Correctly set up unused relays for the run length. Verify that all load shed kit or combined interface/load management board AC relays are properly supplied. Verify that the wire size is correct for the run length. | |
| Loads do not add when load is below 56% | Verify that the generator set maximum load capacity is adequately sized for the application. Verify that the load is not jumping above the maximum capacity. | |
| Loads never add | Verify that % load is below 50%. Verify that the wiring between the load shed kit or combined interface/load management board and the generator set controller is correct. Verify that the generator set maximum load capacity is adequately sized for the application. Verify that the load is not jumping above the maximum capacity. | |
| Load adds and then sheds after about 6 seconds | Verify that the fuel pressure to the generator set is within specification. Verify that the % load is correctly measured. Verify that the wiring between the load shed kit or combined interface/load management board and the CT meets specifications. Verify that the Generator Set maximum Load Capacity is not set too high. One AC relay may have too much load. Even out the loads on the AC relays. Verify that generator frequency is within specification. | |
| Loads continually add and shed | One AC relay may have too much load. Even out the loads on the AC relays. Verify that generator frequency is within specification. | |
| Some loads add but then all loads shed suddenly | Verify stable communication between the load shed kit or combined interface/load management board and the ATS with the generator controller. One AC relay may have too much load. Even out the loads on the AC relays. Verify that generator frequency is within specification. | |
| Load does not shed after transfer to Emergency | Verify that frequency is greater than 59 Hz. Verify that the transfer switch is a model RXT. Verify that the remote start signal is true. Verify that generator set controller is configured as a single-phase unit. Verify that the load shed kit or combined interface/load management board sensed load is less than 7%. | |
| Load sheds when Normal is available | Verify that the ATS is connected correctly. Verify that the system indicates that the Normal source is available. If an RDT transfer switch is used, verify that the remote start signal is off (false). Verify that the load shed kit or combined interface/load management board sensed load is less than 7%. | |
| Short circuits can cause bodily injury and/or equipment damage. | Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (–) lead first when disconnecting the battery. Reconnect the negative (–) lead last when reconnecting the battery. Never connect the negative (–) battery cable to the positive (+) connection terminal of the starter solenoid. Do not test the battery condition by shorting the terminals together. | |
| Battery short circuits can cause bodily injury and/or equipment damage. | Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (–) lead first when disconnecting the battery. Reconnect the negative (–) lead last when reconnecting the battery. Never connect the negative (–) battery cable to the positive (+) connection terminal of the starter solenoid. Do not test the battery condition by shorting the terminals together. | |
| ATS Source shows Remote, indicating no RXT is detected | No RXT is detected; a different model ATS or no ATS is connected to the RDC2 or DC2 controller | Check the RBUS connections from the generator controller to the RXT interface board |
| RXT not responding | Power LED not steady ON; Online LED not steady ON; incorrect version of PC software installed; RXT not shown on SiteTech/OnCue; number of errors and timeouts not steady; RXT ID changes over time; LED blinking faster than once/second; cable runs from genset to RXT outside specifications (cable size and length); more than one RXT connected | 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 |
| Power LED is not lit | Voltage between PWR and COM connections on the generator set not between 10 and 16 VDC; voltage low but not zero; cable size and length outside the range shown in the installation manual; wire run from generator set to RXT; power connections at RXT interface board, genset connection terminal block, or starting battery; voltage to the controller; connections from controller to customer connections on generator set | Check for 10--16 VDC at the PWR and COM connections on the generator set; check the cable size and length to verify they are within the range shown in the installation manual; check the wire run from generator set to RXT; check power connections at the RXT interface board, genset connection terminal block, and starting battery; check voltage to the controller (see controller troubleshooting information and wiring diagrams in the generator set service manual); check connections from controller to customer connections on generator set |
| RXT functions correctly only after cycling power | USB cable connected to generator controller during power cycles; RBUS modules not seen by SiteTech after individual connection sequence; more than three (3) RBUS modules connected; RBUS module serial numbers not different | Verify that the USB cable is not connected to generator controller during power cycles; disconnect RBUS modules and verify that SiteTech/OnCue shows no modules connected; verify that no more than three (3) RBUS modules are connected; verify that each RBUS module serial number is different; verify that all modules are seen by SiteTech after individual connection sequence; if problems persist, contact the Kohler Generator Service Department |
| Exerciser does not start or stop the generator set engine. | Generator set controller not in AUTO mode (AUTO LED not on). | Press the AUTO button on the RDC2/DC2 controller. |
| Exerciser does not start or stop the generator set engine. | Generator set does not start and run when RUN button is pressed. | Troubleshoot the generator set. See the generator set and engine service manuals. |
| Exerciser does not start or stop the generator set engine. | Engine cooldown is operating. | Wait for engine cooldown time delay to expire. |
| Exerciser does not start or stop the generator set engine. | Utility source not available (utility source available LED not illuminated). | Exerciser will not transfer the load or stop the engine if the utility source is not available. Check source circuit breakers and see Sections 4.2 and 5.3. |
| ATS does not transfer the load. | Generator set is running during a scheduled exercise and the controller is not programmed for a loaded exercise. | Set the exercise mode on the RDC2 or DC2 controller to loaded. See the generator set operation manual for instructions. |
| ATS does not transfer the load. | Source circuit breakers/switches are not closed. | Close the source circuit breakers/switches. |
| ATS does not transfer the load. | Source voltage is not within the acceptable range (compare to pickup and dropout settings). | The ATS will not transfer if the source is not available and within the acceptable range. Normal source: wait for the utility source to return and stabilize. Emergency source: Adjust/service the generator set. See the generator set instruction manuals. |
| ATS does not transfer the load. | Transfer to emergency or retransfer to normal time delay has not expired. | Wait for time delays to expire. |
| ATS does not transfer the load. | Source-sensing wiring or operation problem. | Check source-sensing wiring and operation. See Section 5.3 or 5.4. |
| ATS does not transfer the load. | Transfer switch mechanism binding. | Clean and/or service the ATS mechanism. See Section 4.7. |
| ATS does not transfer the load. | Source connection LED on the RDC2 controller does not agree with the actual transfer switch position. | Check the ATS interface board connection to the generator set controller. 3-phase only: Check the position-indicating microswitch wiring and operation. See Section 5.7. |
| ATS does not transfer the load. | Solenoid coil voltage or coil-operation control switch problem. | Check voltage to the solenoid coil(s). Also check coil-operation control switches on 400 amp switches. See Section 5.8. |
| Generator set continues to run after transfer to normal source or exercise period expires. | Engine cooldown time delay has not expired. | Wait for engine cooldown time delay to expire. See the generator set operation manual. |
| Generator set continues to run after transfer to normal source or exercise period expires. | Generator set controller is not in AUTO mode. | Press the AUTO button on the generator set controller. |
| Generator set continues to run after transfer to normal source or exercise period expires. | Utility source is not available. | ATS will not transfer if it does not see an acceptable source. Check utility source voltage and source sensing. See Sections 4.2 and 5.3. |
| Generator set continues to run after transfer to normal source or exercise period expires. | Transfer to Normal not verified (Utility Source position LED on the RDC2 controller not illuminated). | See Figure 4-18, Exerciser Troubleshooting, or Figure 4-19, Failure to Transfer. |
| Generator set continues to run after transfer to normal source or exercise period expires. | Generator set malfunction. | Troubleshoot the generator set. See the generator set service manuals. |
| Load shed AC relays do not activate. | Verify 120 VAC supply voltage to relays. Verify correct wiring to the load shed kit or combined interface/load management board and AC relays. | |
| Metering always reads 0% under load. | Verify that the Emergency feed to the ATS goes through the CT correctly. See Figure 4-22. Verify the CT leads are connected to the load shed kit or combined interface/load management board input correctly. See Figure 4-23 or the wiring diagrams in Section 6. Verify that the correct CT is used. (400 A to 3V) | |
| Metering never reads 0%. | Verify that the CT is wired correctly. Verify that twisted-pair cable was used. Verify that CT wiring is in separate conduit from AC leads. | |
| HVAC units do not shed. | Verify normally closed (NC) output is used to control AC relays. | |
| Does not shed when load is between 85% and 90%. | Verify that the load is not intermittently dropping below 85%. Verify that the load remains above 90% for at least 40 seconds. Verify that the % load is metering correctly. Verify that the overload percent is set at 10% or more below indicated level. Verify that the load shed kit or combined interface/load management board is communicating with the generator set controller. | |
| Does not shed when load is at 100%. | Verify that the % load is steady at 100% for approximately 25 seconds. Verify that the % load is metering correctly. Verify that the overload percent is set at 10% or more below indicated level. Verify that the load shed kit or combined interface/load management board is communicating with the generator set controller. | |
| Does not shed when load is greater than 110%. | Wait at least 15 seconds. Verify that frequency is greater than 59 Hz. Verify that the load shed kit or combined interface/load management board is communicating with the generator set controller. | |
| Generator still overloaded when all loads are shed. | Verify that only non-essential load are connected through the load shed kit or combined interface/load management board. Correctly set up unused relays for the run length. Verify that all load shed kit or combined interface/load management board AC relays are properly supplied. Verify that the wire size is correct for the run length. | |
| Loads do not add when load is below 56%. | Verify that the generator set maximum load capacity is adequately sized for the application. Verify that the load is not jumping above the maximum capacity. | |
| Loads never add. | Verify that % load is below 50%. Verify that the wiring between the load shed kit or combined interface/load management board and the generator set controller is correct. Verify that the generator set maximum load capacity is adequately sized for the application. Verify that the load is not jumping above the maximum capacity. | |
| Load adds and then sheds after about 6 seconds. | Verify that the fuel pressure to the generator set is within specification. Verify that the % load is correctly measured. Verify that the wiring between the load shed kit or combined interface/load management board and the CT meets specifications. Verify that the Generator Set maximum Load Capacity is not set too high. One AC relay may have too much load. Even out the loads on the AC relays. Verify that generator frequency is within specification. | |
| Loads continually add and shed. | One AC relay may have too much load. Even out the loads on the AC relays. Verify that generator frequency is within specification. | |
| Some loads add but then all loads shed suddenly. | Verify stable communication between the load shed kit or combined interface/load management board and the ATS with the generator controller. One AC relay may have too much load. Even out the loads on the AC relays. Verify that generator frequency is within specification. | |
| Load does not shed after transfer to Emergency. | Verify that frequency is greater than 59 Hz. Verify that the transfer switch is a model RXT. Verify that the remote start signal is true. Verify that generator set controller is configured as a single-phase unit. Verify that the load shed kit or combined interface/load management board sensed load is less than 7%. | |
| Load sheds when Normal is available. | Verify that the ATS is connected correctly. Verify that the system indicates that the Normal source is available. If an RDT transfer switch is used, verify that the remote start signal is off (false). Verify that the load shed kit or combined interface/load management board sensed load is less than 7%. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Generator set is running during a scheduled exercise and the controller is not programmed for a loaded exercise.; Transfer switch mechanism binds or does not operate smoothly when manually operated.; Source voltage is not within the acceptable range compared to pickup and dropout settings.; Source circuit breakers/switches are not closed.. See the table for the matching fixes.
Documented causes: Engine cooldown time delay has not expired.; Generator set controller is not in AUTO mode.; Utility source is not available (ATS will not transfer if it does not see an acceptable source).; Generator set malfunction.. See the table for the matching fixes.
Documented causes: Generator set controller is not in AUTO mode (AUTO LED not on).; Generator set does not start and run when RUN button is pressed.; Engine cooldown is operating (controller display indicates engine cooldown).; Utility source available LED on the RDC2 controller or optional ATS status indicator is not illuminated.. See the table for the matching fixes.