Carrier D2-3466-2 instruction manual Input Ground Fault Excessive, Asymmetrical Bus When

Table 6.3 – List of Fault Codes (Continued)

	Fault
Code	Description	Fault Cause	Corrective Action
SrL	Communication	Serial port communication cable, PC	Check connection cable and
	loss between	or OIM communication port setup.	communication port setup.
	Regulator/PC/OIM
UAr	Spurious host PC	Regulator board failure.	Replace Regulator board.
	comm interrupt
UbS	Asymmetrical bus	One of 3 differnet faults has occurred;
	fault. Look at the 3	1. Input Ground Fault - Excessive	1. Check the connection from the
	LEDs on the Power	current flowing bwtween any of the	current transformer to the Bus Control
	Module Interface	three input phases and earth ground.	board.
	board. They	2 . Asymmetrical Bus - When	2. Replace shorted capacitor, fix loose
	indicate which fault	measuring between the cap bank	connection, or replace discharge
	has occurred by	midpoint and the +DC bus and -DC	resistor.
	flashing in unison.	bus, there is a 200 V or greater
		mismatch.
	1 = Input Ground	3. Slow Ramp Rate of DC Bus - DC	3. Turn on drive. If UbS is displayed,
	Fault;	bus did not change to the ful value	turn drive off and then on again very
	2 = Asymmetrical	given time allowed. Can occur only at	quickly. If the UbS fault goes away and
	Bus;	power-up.	the DC bus charges, replace the Bus
	3 = Slow Ramp		Control board.
	Rate of DC Bus

6.4.3 Accessing, Reading, and Clearing the Faults in the Error Log

The following procedure shows how to access and clear the error log. Note that you cannot clear a single entry from the error log. The entire log, including all the fault codes and the day and time stamp of each fault, will be cleared simultaneously using this procedure.

Step 1. Press the PROGRAM key.

The First Menu General parameters are displayed. The PROGRAM LED will turn on.

Troubleshooting the Drive 6-11