Delta Electronics VFD-S manual Fault Code Information, Common Problems and Solutions

Chapter 6 Fault Code Information

The AC motor drive has a comprehensive fault diagnostic system that includes several different alarms and fault messages. Once a fault is detected, the corresponding protective functions will be activated. The following faults are displayed as shown on the AC motor drive digital keypad display. The three most recent faults can be read from the digital keypad or communication.

NOTE

Wait 5 seconds after a fault has been cleared before performing reset via keypad of input terminal.

6.1 Common Problems and Solutions

Fault	Fault Descriptions		Corrective Actions
Name
		1.	Check if motor power corresponds with the
			AC motor drive output power.
		2.	Check the wiring connections to U/T1, V/T2,
			W/T3 for possible short circuits.
		3.	Check the wiring connections between the AC
			motor drive and motor for possible short
			circuits, also to ground.
	Over current	4.	Check for loose contacts between AC motor
			drive and motor.
	Abnormal increase in current.
		5.	Increase the Acceleration Time.
		6.	Check for possible excessive loading
			conditions at the motor.
		7.	If there are still any abnormal conditions when
			operating the AC motor drive after a short-
			circuit is removed and the other points above
			are checked, it should be sent back to
			manufacturer.
		1.	Check if the input voltage falls within the
	Over voltage		rated AC motor drive input voltage range.
		2.	Check for possible voltage transients.
	The DC bus voltage has	3.	DC-bus over-voltage may also be caused by
	exceeded its maximum		motor regeneration. Either increase the
	allowable value.		Decel. Time or add an optional brake resistor.
		4.	Check whether the required brake power is
			within the specified limits.

Revision August 2008, SE09, SW V2.61 6-1