Delta Electronics VFD-M manual Fault Name Fault Descriptions

Chapter 6 Fault Code Information and Maintenance

Fault Name		Fault Descriptions		Corrective Actions
	Over-current during steady state		1.	Check for possible poor insulation at the
	operation:
				output line.
	1.	Short-circuit at motor output.
			2.	Check for possible motor stall.
	2.	Sudden increase in motor
			3.	Replace with the AC drive with one that
		loading.
				has a higher output capacity (next HP
	3.	AC drive output capacity is
				size).
		too small.
			1.	Switch off power supply.
	Internal memory IC can not be		2.	Check whether the input voltage falls
	programmed.			within the rated AC drive input voltage.
			3.	Switch the AC drive back on.
			1.	Check the connections between the
	Internal memory IC can not be			main control board and the power
	read.			board.
			2.	Reset drive to factory defaults.
	The external terminal EF-GND		When external terminal EF-GND is closed,
			the output will be turned off (under N.O.
	goes from OFF to ON.
			E.F.).
	Auto accel/decel failure		Don’t use the function of auto acceleration/
			deceleration.
	Ground fault :
	The AC drive output is abnormal.		Ground fault :
	When the output terminal is
	grounded (short circuit current is		1.	Check whether the IGBT power module
	50% more than the AC drive rated
				is damaged.
	current), the AC drive power
			2.	Check for possible poor insulation at
	module may be damaged. The
				the output line.
	short circuit protection is provided
	for AC drive protection, not user
	protection.
	Communication Error		1.	Check the connection between the AC
				drive and computer for loose wires.
	Please refer to Pr.92.		2.	Check if the communication protocol is
				properly set.
			1.	When the external input terminal (base-
	External Base Block.			block) is active, the AC drive output will
				be turned off.
	AC drive output is turned off.
			2.	Disable this connection and the AC
				drive will begin to work again.

Revision May 2008, ME14, SW V3.04 6-3