Carrier D2-3466-2 instruction manual Code, Description, Fault Cause, Corrective Action

Table 6.3 – List of Fault Codes (Continued)

	Fault
Code	Description	Fault Cause	Corrective Action
HU	High DC bus	DC bus voltage too high (capacitor	Check input line voltage; if necessary,
	voltage	protection).	add transformer.
		Deceleration time too short.	Increase deceleration time
			P.002/P.018/P.023 versus Maximum
			Speed/Hz (P.004). Install DB option
			with resistors.
IPL	Input phase loss	Voltage ripple on DC bus due to	Verify that proper voltage is being
		missing input phase or an imbalance	applied to the drive. Check all phases.
		between phases.
LU	Low DC bus	DC bus voltage too low. Line dip too	Check input voltage, line fuses. If
	voltage	long (P.042).	necessary, add transformer. Check
			value of Ride Through Time (P.042),
			Line Voltage (H.021, U.018).
		Input rectifier diodes defective.	Check DC bus voltage. If incorrect,
			replace diode set.
nCL	Network comm loss	Communications with the	Check network cabling from network
		AutoMax network have been lost.	master to network option board. Check
			that network master is operating
			properly.
nId	Identification	Drive started but Identification	Reset fault. Perform Identification
	Request not yet	Result = Zero.	Request. Restart drive.
	performed (V/Hz
	only)
OC	Overcurrent	Output phase-to-phase short.	Check isolation between each output
	(steady state).		line.
	Trips between 185	Bus voltage line-to-line.	Check transistor modules for correct
	to 200% load		output. If incorrect, possible board
	(based on inverter		defect; replace. Possible Hall effect
	type current) check		current sensor defective; replace.
	Power Module
		Ground fault.	Check isolation between ground and
	rating.
			output terminals. Possible leakage
			current sensor defect; replace sensor.
		Momentary overload.	Check for motor overload; reduce load
			on motor.
		Bad motor.	Check motor for correct operation.
		Torque boost / V/Hz too high (V/Hz).	Check parameters H.001, H.002,
			and/or H.003. Enable Identification
			Request (H.020)
		Motor unknown to regulator (V/Hz).	Check that regulator was updated with
			actual motor characteristics via
			Identification Request (H.020).
		Parameter settings (vector).	Check Encoder PPR (U.001), Motor
			Poles (U.002), Base Frequency
			(U.003), Motor Nameplate Amps
			(U.004), Magnetizing Current (U.006),
			Speed Regulator Prop. Gain (U.012).
		Encoder wired incorrectly, wrong PPR.	Check encoder wiring. Perform vector
			self-tuning.
OCA	Overcurrent (at	Overcurrent condition occurred while	See OC fault corrective actions.
	acceleration)	accelerating.	Increase acceleration time (P.001,
		Acceleration time too short.	P.017, P.021).

Troubleshooting the Drive 6-9