Delta Electronics VFD007S23A Fault Descriptions Corrective Actions Name, Constant speed operation

			Chapter 6 Fault Code InformationVFD-S Series
Fault	Fault Descriptions		Corrective Actions
Name
		1. Short-circuit at motor output: Check for
			possible poor insulation at the output line.
	Over-current during	2. Sudden increase in motor loading: Check for
			possible motor stall.
	constant speed operation
		3. AC motor drive output power is too small:
			Replace the AC motor drive with the next
			higher power model.
		1. When multi-function input terminals (MI1-MI6)
	External Fault		are set to external fault, the AC motor drive
			stops output U, V and W.
		2. Give RESET command after fault has been
			cleared.
	Internal EEPROM can not be	Return to the factory.
	programmed.
	Internal EEPROM can not be	Return to the factory.
	programmed.
		1.	Switch off power supply.
	Drive’s internal circuitry	2.	Check whether the input voltage falls within the
	abnormal.		rated AC drive input voltage. Switch on the AC
			drive.
	OH error
	OV error
	LV error	Return to the factory.
	Current detection error
	DC BUS detection error
	Current detection error
		When (one of) the output terminal(s) is grounded,
		short circuit current is more than 50% of AC motor
		drive rated current, the AC motor drive power
		module may be damaged.
		NOTE: The short circuit protection is provided
	Ground fault	for AC motor drive protection, not for
		protection of the user.
		1. Check whether the IGBT power module is
			damaged.
		2. Check for possible poor insulation at the
			output line.
		1.	When the external input terminal (B.B) is
	External Base Block.		active, the AC motor drive output will be
			turned off.
	(Refer to Pr. 8-06)
		2.	Deactivate the external input terminal (B.B) to
			operate the AC motor drive again.
		1. Check if the motor is suitable for operation by
	Auto accel/decel failure		AC motor drive.
		2.	Check if the regenerative energy is too large.
		3.	Load may have changed suddenly.

Revision August 2006, SE08, SW V2.61 6-3