The VSC (Variable Speed) is a generator-set controller. It is used on generator sets from Kohler, including the 6VSG.
| Code | Meaning | Remedy |
|---|---|---|
| AC Sens Loss Shutdwn | Loss of AC sensing shutdown — Shutdown: The controller shut down the generator because there was less than 5% of rated voltage measured on Phase A for 3 seconds, only in AUTO, only after acceptable voltage (> 5% of UV setting) has been detected. | Check for loose wiring and connections; Check all AC leads; Troubleshoot alternator. |
| AC Sens Loss Warning | Loss of AC sensing warning — Warning: The controller has measured less than 5% of rated voltage on Phase A for 1 second, 10 seconds after crank disconnect. | Check for loose wiring and connections; Check all AC leads; Troubleshoot alternator. |
| AccyPwrOver Warning | Accessory Power Overload — Warning: An overcurrent fault (short circuit) on the accessory power output. | Check wiring to accessories; Check PWR and COM connections; Troubleshoot the accessories; Refer to the documentation provided with the accessories. |
| Always Off | Always Off — Notice: OnCue's Power Chain view has been used to control this digital output. The digital output is no longer controlled by the generator set. Applies to digital outputs B3 through B6 on the PIM only. | Click on the output in OnCue's Power Chain view to turn the output on or off. See the OnCue Operation Manual; To reset the digital output to a function controlled by the generator set, use SiteTech software to re-assign the output event. |
| Always On | Always On — Notice | |
| Auto Locked | Chicago Code Active — Notice: The digital output for Chicago Code Active (PIM) is active (contacts closed), indicating the digital input for Chicago Code Active (PIM) is active (low) and thus master switch is locked in the AUTO position. | Check customer equipment connected to the PIM module. |
| Aux Input Shutdwn | Auxiliary input shutdown — Shutdown: The controller shut down the generator because the digital input for a custom shutdown (AuxiliaryInputShutdown - PIM) was activated (low). | Check customer equipment connected to the PIM module |
| Aux Input Warning | Auxiliary input warning — Warning: The digital input for a custom warning (AuxiliaryInputWarning - PIM) is active (low). | Check customer equipment connected to the PIM module |
| Batt Chg Flt Warning | Battery charger fault warning — Warning: The digital input for Battery Charger Fault Warning (PIM) is active (low). For an external battery charger only, not applicable to the VSC built-in battery charging. | Check customer equipment connected to the PIM module. |
| Battery CRLow Warning | Battery CRLow Warning — Warning: Battery voltage dropped to 11 VDC or less for 30 seconds or more. | Check engine starting battery; Check battery charger DC output voltage from VSC on lead CHO to the battery. |
| Battery High Warning | Battery High Warning — Warning: The controller has measured battery voltage that is above the high warning setting for 10 seconds or more. Operates during exercise and normal operation. | Check engine starting battery. |
| Battery Low Warning | Battery Low Warning — Warning: The controller has measured battery voltage that is below the low warning setting for 90 seconds or more. The battery voltage is checked before allowing an exercise to start. | Check engine starting battery; Check battery charger DC output voltage from VSC on lead CHO to the battery. |
| Chk DateTime Warning | Check date and time warning — Warning: DC power to the controller has been interrupted and the date and time may not be correct. Event history may not have accurate time/date stamps. | Verify the time and date settings to ensure proper operation of scheduled operations and for event history logging. |
| Common Fault | Common Fault — Notice: The digital output for Common Fault (PIM) is active (contacts closed), indicating the generator is shutdown for any (all) fault. | Check for faults and troubleshoot any/all fault conditions individually. |
| Common Warng | Common Warng — Notice: The digital output for Common Warning (PIM) is active (contacts closed), indicating that any (all) warning is active. | Check for warnings and troubleshoot any/all warning conditions individually. |
| Default Pars Warning | Default Parameters — Warning: The controller has been loaded with default parameters. | Configure settings as required for desired operation. |
| 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. | |
| Enclosure Intrusion Alarm | Enclosure Intrusion Alarm — Warning: Enclosure door is open. (Optional communications kit required.) | Close and secure the enclosure door; Check for signs of unauthorized entry. |
| Eng Cooldown | Eng Cooldown — Notice: The digital output for Engine Cooldown Active (PIM) is active (contacts closed), indicating the generator is running in cooldown. (Delay 5 min.) | Check remote start circuit if it was expected that the generator should be running. |
| Engine M/N Invalid Shutdwn | Engine M/N Invalid Shutdwn — Shutdown: Generator model number has not been entered. (Engine model number is selected automatically based on generator set model.) | Enter the generator set model number from the VSC keypad, or use SiteTech to select the genset model number. |
| Engine Speed High Shutdwn | Engine Speed High Shutdwn — Shutdown: The controller shut down the generator because engine speed, as calculated from AC frequency, was above the high speed setting for 0.3 seconds or more. | Troubleshoot engine operation per the engine service manual. |
| Engine Speed Low Shutdwn | Engine Speed Low Shutdwn — Shutdown: The controller shut down the generator, after crank disconnect, because engine speed, as calculated from AC frequency, was below the low speed setting for 3 seconds or more. | Troubleshoot engine operation per the engine service manual. |
| Exer Not Sch Warning | Exer Not Sch Warning — Warning: There is no exercise scheduled. | Set the exercise schedule. |
| Fuel Leak Shutdwn | Fuel Leak Shutdwn — Shutdown: The controller shut down the generator because the digital input for Fuel Tank Leak Shutdown (PIM) was activated (low). | Check customer equipment connected to the PIM module. |
| Fuel Leak Warning | Fuel Leak Warning — Warning: The digital input for Fuel Tank Leak Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. |
| Fuel Level CrHi Warning | Fuel Level CrHi Warning — Warning: The digital input for Critically High Fuel Level Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. |
| Fuel Level High Warning | Fuel Level High Warning — Warning: The digital input for High Engine Fuel Level Warning (PIM) is active (low). | |
| Fuel Level Low Shutdwn | Fuel Level Low Shutdwn — Shutdown: The controller shut down the generator because the digital input for Low Fuel Level Shutdown (PIM) was activated (low). | Check customer equipment connected to the PIM module. |
| Fuel Level Low Warning | Fuel Level Low Warning — Warning: The digital input for Low Fuel Level Warning (PIM) is active (low). | |
| Fuel Pressure Low | Fuel Pressure Low — Warning: Fuel pressure sensor has measured fuel pressure below 4.5 inches of water column. (Optional communications kit required.) | Check fuel supply and fuel lines; Check the fuel pressure at the regulator. See Section 5.8.2. |
| Fuel Spill | Fuel Spill — Notice: The digital output for Fuel Spill (PIM) is active (contacts closed), indicating any of the digital inputs for Fuel Tank Leak Warning, Fuel Tank Leak Shutdown, Engine Fuel Level Warning or Engine Fuel Level Critically High (PIM) is active (low). | Check customer equipment connected to the PIM module. |
| Gen Running | Gen Running — Notice: The digital output for Generator Running (PIM) is active (contacts closed), indicating the generator is running. | Check controller front panel buttons for potential RUN command; If in AUTO, check remote start lines. |
| GenBrkerOpen Warning | Generator Circuit Breaker Open — Warning: There is voltage at the generator set but no voltage measured on the emergency side of the ATS (Model RXT transfer switch required). | Check line circuit breaker; Check for and correct short circuits or overloading on the load side before resetting the circuit breaker. |
| Ground Fault Warning | Ground Fault Warning — Warning: The digital input for Ground Fault Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. |
| High Lube Oil Temperature Shutdown | High Lube Oil Temperature Shutdown — Shutdown: Oil temperature higher than 325°F (163°C). | |
| High Lube Oil Temperature Warning | High Lube Oil Temperature Warning — Warning: Oil temperature higher than 300°F (149°C). | See Overheats in the troubleshooting charts in Section 4.9. |
| Lo Crank Vlt Warning | Lo Crank Vlt Warning — Warning: During cranking, the controller measured battery voltage less than 60% (7.2V or 14.4V) for 6 seconds or more during cranking. | Check cranking battery. |
| Locked Rotor Shutdwn | Locked Rotor Shutdwn — Shutdown: The controller shut down the generator because no rotation of the engine or alternator was detected, for 3 seconds or more, during cranking. | Check cranking circuit; Troubleshoot the engine. See Engine Service Manuals; Check alternator connections to controller and auxiliary winding circuit breaker; Troubleshoot the alternator. |
| Low Fuel | Low Fuel — Notice: The digital output for Low Fuel (PIM) is active (contacts closed), indicating any of the digital inputs for Low Fuel Pressure Warning, Low Fuel Level Warning or Low Fuel Level Shutdown (PIM) is active (low). | Check customer equipment connected to the PIM module. |
| MainPwrOverL Shutdwn | MainPwrOverL Shutdwn — Shutdown: The internal current limit circuit has tripped, indicating an overcurrent condition on the DC power supply circuit. | Check crank, run, and flash relay circuits for short circuits. |
| Maint Req'd Warning | Maint Req'd Warning — Warning: Engine run time, or calendar days, has exceeded the maintenance reminder setting. | Change the oil and perform other maintenance according to the service schedule in Section 2.1; Reset the maintenance timer after service. See Section 2.3. |
| Minor Fault | Minor Fault — Notice: The digital output for Minor Fault (PIM) is active (contacts closed), indicating either the digital input for Ground Fault Indicator Warning (PIM) is active (low) or the controller detected Low Cranking Voltage. | Check customer equipment connected to the PIM module; Check cranking battery condition. |
| Not In Auto Warning | Not In Auto Warning — Warning: The VSC controller is not in AUTO. The generator will not start from a remote device. The digital output for Not In Auto (PIM) is active (contacts closed). | Press the Auto button to ensure automatic system operation. |
| OB1 CommLoss (PIM) | OB1 CommLoss (PIM) — Warning: Communications with option board #1 has been lost. | Check RBUS wiring to inoperative option board. |
| Oil Level Low Shutdwn | Oil Level Low Shutdwn — Shutdown: The controller shut down the generator because the digital input for Low Oil Level Shutdown (PIM) was activated (low). | Check customer equipment connected to the PIM module. |
| Oil Level Low Warning | Oil Level Low Warning — Warning: The digital input for Low Oil Level Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. |
| Oil Pressure Low Shutdwn | Oil Pressure Low Shutdwn — Shutdown: The low oil pressure switch was closed for 5 seconds or more, indicating low oil pressure. Function is inhibited until 30 seconds after crank disconnect. | Check for oil leaks; Check the oil level and add oil if low; Check the oil pressure sensor; see Engine Service Manuals. |
| Oil Pressure OpenCR Warning | Oil Pressure OpenCR Warning — Warning: When the generator set is not running and controller is in OFF or AUTO, the low oil pressure switch is not working properly. | Check the oil pressure switch connection; Replace the LOP switch if necessary. See Section 5.7.2. |
| Over Crank Shutdwn | Over Crank Shutdwn — Shutdown: The controller shut down the generator, and ceased cranking, because the engine was not successfully started after the completion of the last of the crank cycles setting delay 15 seconds. | Check fuel supply; Check cranking circuit; Check cranking battery; Troubleshoot engine; see Engine Service Manuals. |
| RBUS ComError Warning | RBUS ComError Warning — Warning: The controller has lost communications with a PIM that had previously been communicating properly. | Check connection to the PIM. |
| Reserve Oil Empty | Reserve Oil Empty — Warning: The oil makeup kit reservoir bottle is empty. (Optional communications kit and oil makeup kit required.) | Add oil to the oil makeup kit reservoir. See TT-1591, provided with the oil makeup kit, if necessary. |
| 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. |
| Run Btn Ack | Run Button Acknowledged — Notice: The RUN button on the controller has been pushed. | |
| Spd Sens Flt Shutdwn | Speed sensor fault — Shutdown: The controller shut down the generator because the speed signal was lost. | Check leads AC1 and AC2 between the alternator and the controller; This fault also occurs if the engine stalls; check the engine and see the troubleshooting chart in Section 4.9. |
| Start Delay | Engine Start Delay Active — Notice: The digital output for Engine Start Delay (PIM) is active (contacts closed), indicating the engine is in between active cranking cycles. | |
| System Ready | System Ready — Notice: The digital output for System Ready (PIM) is active (contacts closed), indicating the generator has no active faults or warnings. | |
| VSpdStartCmd | Variable Speed Start Command — Notice: A diagnostic exercise request has been received by the controller. | Check for a remote exercise command from OnCue. |
| Volts L1-L2 DC High Shutdwn | Volts L1-L2 DC High Shutdwn — Shutdown: The controller shut down the generator because the voltage measured from Phase A to Phase B exceeded the high limit for a time greater than the delay setting 2 seconds. | Troubleshoot alternator. See Section 4.9, Troubleshooting Charts, and Section 5, Component Testing and Adjustment. |
| Symptom | Cause | Remedy |
|---|---|---|
| Cannot change input and output settings | Controller is set up for the optional communications kit, which locks the input and output settings | For a generator set with a communications kit, no action is needed; Inputs and outputs are not adjustable; If the generator set is connected to a PIM, use SiteTech to change the Personality Installed Option parameter setting |
| Controller LCD display is off | Low or no battery voltage | Check controller connections |
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.