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 |
|---|---|---|---|
| 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 | |
| Accy PwrOver Warning | Accy PwrOver Warning | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| Accy PwrOver Warning | Accy PwrOver Warning — controller internal circuit protection activated | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| Accy PwrOver Warning | Controller internal circuit protection activated | Press OFF to reset. Contact an authorized Kohler distributor/dealer for service | |
| 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 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. Because the system does not know which voltage is correct, the generators will not be allowed to start | One of the two generators is incorrectly configured; Intermittent connections on RBUS network wiring | |
| ChkngMeter | This generator has paralleled to the other generator and is verifying that the metering is connected and establishing the connection direction | Status message appears the first time the two generators are paralleled | |
| ConCheckFail | Failure to Auto-Discover APM connections | Wires 9A and 9B crossed between the generators; Wires 9A or 9B not connected | |
| ConChecking | Performing APM connection auto-discovery | This generator has started in RUN, the other generator is in OFF | |
| ConNotDeterm | APM connection auto-discovery is not complete. This means that the generator does not know which contactor is connected to it | Generators not yet started in RUN with other generator in OFF | See the APM instruction sheet for instructions to perform the auto-discovery procedure |
| ContactorOk | Successful auto-discovery of APM connections | Auto-discovery was activated by placing other generator in OFF and this generator in RUN | |
| Current A High Warning | Over Current — Paralleled; delay 10 sec.; display cleared on Press AUTO or OFF | ||
| 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 | ||
| Emerg Stop Shutdwn | Emerg Stop Shutdwn | Remote emergency stop button activated or shutdown (prime mover) switch turned to the off (open, O) position | Reset the remote emergency stop switch(es) and reset the controller by pressing the OFF/RESET button; Press I on the shutdown switch to allow the engine to start and run |
| 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; delay 10 sec.; display cleared on Press AUTO or OFF | ||
| Frequency Low Warning | Under Frequency — Paralleled; delay 10 sec.; display cleared on Press AUTO or OFF | ||
| Generator Management Off | This generator has been stopped by generator management because it is not presently needed to supply the load. The generator is available and will start if it is needed again | ||
| 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; Intermittent connections on RBUS network wiring | Check the battery connections; 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 | |
| MainPwrOverL Shutdown | Controller internal circuit protection activated | Press OFF to reset. Contact an authorized Kohler distributor/dealer for service | |
| MainPwrOverL Shutdown | MainPwrOverL Shutdown | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| MainPwrOverL Shutdown | MainPwrOverL Shutdown — controller internal circuit protection activated | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| 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 |
| 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 | |
| Overcrank | System shuts down on an overcrank fault if the generator set does not start in three attempts | Reset the controller. If the overcrank fault occurs again, contact an authorized distributor/dealer | |
| ProtectiveRelayTrippedContactor | The contactor has been forced to open to protect one of the generators or the customer’s load | ||
| Reactive Power Low Warning | Loss of Field — Paralleled; delay 10 sec.; display cleared on Press AUTO or OFF | ||
| Real Power High Warning | Over Power — Paralleled; delay 10 sec.; display cleared on Press AUTO or OFF | ||
| Real Power Low Warning | Reverse Power — Paralleled; delay 10 sec.; display cleared on Press AUTO or OFF | ||
| 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 | |
| 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 | |
| Synchronizing | The generator is actively trying to match frequency, voltage and phase with that of the paralleling bus | ||
| Unloading | The generator is actively trying to transfer load from itself to the other generator | ||
| Voltage L1-L2 High Warning | Over Voltage — Paralleled; delay 10 sec.; display cleared on Press AUTO or OFF | ||
| Voltage L1-L2 Low Warning | Under Voltage — Paralleled; delay 10 sec.; display cleared on Press AUTO or OFF |
| Symptom | Cause | Remedy |
|---|---|---|
| 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 |
| 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 | Check the RBUS connections from the RDC2 controller on the generator to the interface board on the RXT transfer switch |
| 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 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. |
| 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 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 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. |
| 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 |
| 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 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 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. | |
| 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 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. |
| 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. |
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.