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HVAC Drive H300 Drive Fault Codes

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Complete guide to Nidec Control Techniques HVAC Drive H300 errors. Learn to troubleshoot Fire Mode, BACnet comms, OI.AC, and It.AC trips using the HOA keypad and Connect software. H300 Fault Codes Reference Table Below is the reference list of common trips and alarms for the HVAC Drive H300. The drive distinguishes between “Alarms” (which warn you of a developing issue) and “Trips” (which stop the motor to protect equipment). HVAC Drive H300 Faults and Alarms HVAC Drive H300 - Trip Indications Fault Code and Meaning Cause and Remedy 28 An Input 1 Loss (Analog input 1 current loss) Cause: Current loss detected in current mode on Analog input 1 (Terminal 5, 6). In 4-20 mA and 20-4 mA modes, loss of input is detected if the current falls below 3 mA. Remedy: Check control wiring is correct. Check control wiring is undamaged. Check the Analog Input 1 Mode (07.007). En...
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Commander SX Drive Fault Codes

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Troubleshooting guide for the IP66/NEMA 4X Control Techniques Commander SX drive. Learn to decode mnemonic trips, access fault history, and fix hardware faults. Commander SX Fault Codes Reference Table Below is the reference list of trips for the Commander SX. Locate the code shown on your drive’s integrated LED display to determine the cause of the protective shutdown. Control Techniques COMMANDER SX Faults and Diagnostics Commander SX Faults and Diagnostics Fault Code and Meaning Cause and Remedy cL1 ADI1 loss Cause: Loss of the current reference on analog input ADI1. Remedy: Check that current is > 3 mA. If 10.37 = 1 (Ctld), the drive decelerates the motor without tripping. cL2 ADI2 loss Cause: Loss of the current reference on analog input ADI2. Remedy: Ch...
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Commander SK Drive Fault Codes

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Detailed guide to diagnosing Control Techniques Commander SK trip codes. Learn to interpret OI.AC, It.AC, and HF hardware faults to minimize system downtime. Commander SK Fault Codes Reference Table Below is the reference list of trips for the Commander SK. Locate the mnemonic appearing on your drive’s LED display to understand the protective action taken by the drive. Commander SK Faults and Alarms Commander SK Diagnostics (Faults & Alarms) Fault Code and Meaning Cause and Remedy UV DC bus under voltage Cause: Low AC supply voltage. Low DC bus voltage when supplied by an external DC power supply. Remedy: Check power supply voltage and connections. OV DC bus over voltage Cause: Deceleration rate set too fast for the inertia of the machine. Mechanical load driving the motor. Remedy: Increa...
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Commander SE Drive Fault Codes

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Troubleshooting guide for the legacy Control Techniques Commander SE drive. Learn to interpret mnemonic trips like OI.AC, OV, and HF, access the trip log, and perform resets. Commander SE Fault Codes Reference Table Below is the reference list of trips for the Commander SE. These codes are displayed on the front panel when the drive enters a fault state and stops the motor. Commander SE Drive Fault Codes Commander SE Trip Codes & Diagnostics Fault Code and Meaning Cause and Remedy UU (1) DC link under voltage Cause: Low AC supply voltage. Low DC link voltage when supplied by external DC power supply. Remedy: Check power supply voltage. OU (2) DC link over voltage Cause: Excessive inertia in the machine during deceleration. Deceleration rate set too fast for inertia of machine. Remedy: Adjust deceleration ra...
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