The DC2 is a generator-set controller. It is used on generator sets from Kohler, including the 10RESV, 12RESV, 14RES and 20RES.
Also fitted to: Kohler 14/20RESA/RESAL, Kohler 20RESA/20RESAL/20RESC/RESCL, Kohler 20RESC/RESCL, Kohler RESA/RESAL.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| BusDeadLive | The bus is measured to be dead when one of the generators is supposed to be supplying voltage to the bus (closed contactor) | Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly. | |
| BusLiveDead | The bus is measured to be live when no generators are connected to it (both contactors open). | Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly. | |
| CfgModelNum | The two generators that are intended to be paralleled have incompatible model numbers. | Incorrect configuration of one of the generators. Different generator types. The paralleled generator sets must be the same kW model. (i.e. two 14 kW or two 20 kW models.) | |
| CfgSysVolt | The system voltage of the two generators intended to be paralleled is not the same. | One of the two generators is incorrectly configured. Intermittent connections on RBUS network wiring. | |
| Current A High Warning | Over Current Paralleled | Press AUTO or OFF * | |
| ErraticSig | The power metering on this controller gives a signal that is not consistent with the system configuration. Reversing the power direction does not resolve the problem. | Bad wiring to the CT. Too much tension on wires from the CT to the controller. | |
| Frequency High Warning | Over Frequency Paralleled | Press AUTO or OFF * | |
| Frequency Low Warning | Under Frequency Paralleled | Press AUTO or OFF * | |
| LossOfComAPM | The Automatic Paralleling Module has stopped communicating on RBUS. (An APM was detected on the RBUS network but is no longer communicating.) | APM is unplugged. Primary controller is powered down. Check the battery connections. See previous page for more information. Intermittent connections on RBUS network wiring. Check RBUS communication connections. | |
| LossOfComm2 | Communication Lost with Secondary Controller | ||
| LossOfComm2 | The primary controller has lost communication with the secondary controller. (A secondary controller was detected, then communication was lost.) | RBUS disconnected, secondary controller battery disconnected, updating firmware in secondary controller, or intermittent RBUS connections. | |
| LossOfField | This generator has absorbed more than 25% reactive power (magnetic excitation current) for 20 seconds Generator voltage on this generator is not calibrated correctly. Generator voltage on other generator is not calibrated correctly. Bus voltage on this generator is not calibrated correctly. Bus voltage on the other generator is not calibrated correctly. | ||
| MeterUnknown | This generator does not know if the metering is connected or the orientation of the connection. This means that the generators can’t share load accurately until this information is known. | System commissioning and startup not yet complete. See the APM instructions. | |
| MeteringOk | The generator has verified that the metering is connected correctly and that the direction is consistent with expected power direction. Status message indicates that the CT is connected to the generator correctly. | ||
| NoCurrent | The generator has applied load (using the other generator) and has observed no current on the power sensing inputs. | The CT is not connected to the controller. The output leads from the generator do not go through the CT in the correct direction. See the APM instructions. | |
| Reactive Power Low Warning | Loss of Field Paralleled | Press AUTO or OFF * | |
| Real Power High Warning | Over Power Paralleled | Press AUTO or OFF * | |
| Real Power Low Warning | Reverse Power Paralleled | Press AUTO or OFF * | |
| SyncFailure | The generator has been attempting to synchronize for over 2 minutes without success. | Generator is hunting. Advanced speed control settings need adjustment. Load is changing frequently to disturb the online generator. | |
| Voltage L1-L2 High Warning | Over Voltage Paralleled | Press AUTO or OFF * | |
| Voltage L1-L2 Low Warning | Under Voltage Paralleled | Press AUTO or OFF * |
| Symptom | Cause | Remedy |
|---|---|---|
| ATS Status or Configuration menus are not displayed on the RDC2 controller | Check the RBUS connections from the RDC2 controller on the generator to the interface board on the RXT transfer switch. | |
| ATS settings are not correctly configured | On systems equipped with the DC2 controller, a personal computer and Kohlerr SiteTecht software must be used to adjust the ATS settings. See Section 4.3. | |
| ATS status and settings are not correct | Check the ATS status and settings. Use the RDC2 controller menus and/or connect a personal computer (PC) to the RDC2 or DC2 controller on the generator set and use the Kohlerr SiteTecht program on your PC. | |
| Accy PwrOver Warning or MainPwrOverL Shutdown | Internal circuit protection is activated. | Press OFF to reset. Contact an authorized Kohler distributor/dealer for service. |
| Application code version number is outdated | Check the application code version number on the RDC2/DC2 controller. Check TechTools for the latest information about application code updates, and obtain the latest version if necessary. | |
| Auxiliary winding circuit breaker tripped. | Reset the circuit breaker (located in controller’s service access area). Contact an authorized distributor/dealer for service if breaker trips repeatedly. | |
| Battery acid cleanup | Add 500 g (1 lb.) of bicarbonate of soda to a container with 4 L (1 gal.) of water and mix the neutralizing solution. Pour the neutralizing solution on the spilled battery acid until all evidence of a chemical reaction has ceased. Flush the resulting liquid with water and dry the area. | |
| Battery acid on skin | Flush the affected area for 15 minutes with large quantities of clean water and seek medical aid if necessary. | |
| Battery acid splashes in the eyes | Immediately flush the affected area for 15 minutes with large quantities of clean water. Seek immediate medical aid. | |
| Battery short circuits | 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. | |
| Bodily injury and/or equipment damage | Battery short circuits | 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. |
| Controller display backlight is off. | Backlight turns off after about 1 minute with no activity. Backlight will turn on when a button is pressed or the generator set starts. | |
| Controller display is off. | Low or no battery voltage. | Check connections. Check generator set battery. See Figure 5-5. |
| Corrosion, loose terminals, damaged wiring or connectors | Unplug connectors and check terminals and leads for corrosion. Remove corrosion from terminals and leads. Tighten loose terminals. Check wiring harnesses for continuity or short circuits. Recrimp or replace loosely connected lead terminals. | |
| Engine does not start | Low oil pressure or oil level | Check and refill oil if necessary. Refer to the 'Oil Check' section for details. |
| Engine malfunction. | Contact an authorized distributor/dealer. | |
| Engine overheats | Coolant level is low or coolant is contaminated | Check and refill coolant if necessary. Refer to the 'Cooling System' section for details. |
| Explosion | Fuel system leakage | Check LPG vapor or natural gas fuel system for leakage by using a soap and water solution with the fuel system test pressurized to 6-8 ounces per square inch (10-14 inches water column). |
| Fault messages displayed on the controller | Identify and correct the cause of the fault condition. Then reset the controller after a fault shutdown. See Section 2.5.4. | |
| Fault shutdown. | Check the controller display for fault messages. See Section 2.5. Correct the fault condition and reset the controller. | |
| Fire | 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. |
| Fuel pressure insufficient. | Check the fuel supply and valves. | |
| Generator produces low voltage output | Dirty air filter | Clean the air filter as per the instructions in the 'Air Cleaner Service' section. |
| Generator set accidentally starts | Disconnect the battery cables before working on the generator set. Remove the negative (- ) lead first when disconnecting the battery. Reconnect the negative (- ) lead last when reconnecting the battery. | |
| Generator set circuit breaker trips repeatedly | Contact an authorized distributor/dealer for service. | |
| Generator set in the OFF mode. | Press the RUN button to start the engine or press AUTO to allow remote starting. | |
| Generator set stops suddenly. | Low oil pressure shutdown. | Check for oil leaks. Check the oil level and add oil if necessary. |
| Generator thermostat tripped. | Check for obstructed air inlets and outlets. Reset the thermostat. See Section 5.5. | |
| Gererator thermostat tripped. | For trips other than temperature (nuisance trips), | Reset the thermostat. See Section 2.6. |
| Hot engine and exhaust system | Do not work on the generator set until it cools. | |
| Line circuit breaker tripping because of overload. | Reduce the load on the generator set. | |
| Line circuit breaker tripping because of short circuit. | Contact an authorized distributor/dealer for service. | |
| Loose or open connections or short circuits from the RXT interface board to the generator set | Check the connections from the RXT interface board to the generator set for loose or open connections or short circuits. | |
| Low oil pressure shutdown. | Check for oil leaks. Check the oil level and add oil if necessary. | |
| Low output or excessive drop in voltage. | Generator set overloaded. | Reduce the load. |
| No AC output. | Line circuit breaker in the OFF position. | Place the circuit breaker in the ON position. |
| No fuel. | Check fuel valves and fuel supply. | |
| Optional equipment such as Load Control Module (LCM) is not properly disconnected | Disconnect optional equipment such as the Load Control Module (LCM) and test the ATS operation to isolate problems to the transfer switch or connected accessories. | |
| Overcrank shutdown. | Reset the controller. If the overcrank fault occurs again, contact an authorized distributor/dealer. |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.