Mitsubishi Electronics FR-A500L Errors Alarms, Error alarm definitions, Operation Parameter

5.1Errors (Alarms)

PROTECTIVE FUNCTIONS

If any fault has occurred in the inverter, the corresponding protective function is activated and the error (alarm) indication appears automatically on the PU display. When the protective function is activated, refer to "5.2 Troubleshooting" and clear up the cause by taking proper action. If an alarm stop has occurred, the inverter must be reset to restart it.

5.1.1 Error (alarm) definitions

Operation	Parameter
Panel
	Unit	Name		Description
Display
	(FR-PU04)
(FR-DU04)
E.OC1	OC During	During
	Acc	acceleration
	Stedy Spd	During
E.OC2		constant	Overcurrent	When the inverter output current reaches or exceeds approx. 200% of the
	OC
		speed	shut-off	rated current, the protective circuit is activated to stop the inverter output.
	OC During	During
E.OC3		deceleration
	Dec
		During stop
E.OV1	OV During	During
	Acc	acceleration
				If regenerative energy from the running motor causes the inverter's
	Stedy Spd	During
			Regenerative	internal main circuit DC voltage to reach or exceed the specified value,
E.OV2		constant
	OV		overvoltage	the protective circuit is activated to stop the inverter output.
		speed
			shut-off	This may also be activated by a surge voltage generated in the power
		During
	OV During			supply system.
E.OV3		deceleration
	Dec
		During stop
				The electronic overcurrent protection in the inverter detects motor
				overheat due to overload or cooling capability reduced during constant-
				speed operation. When 85% of the preset value is reached, pre-alarm
E.THM	Motor		Motor	(TH indication) occurs. When the specified value is reached, the
	Ovrload			protective circuit is activated to stop the inverter output. When a special
		Overload
				motor such as a multi-pole motor or more than one motor is run, the
		shut-off
				motor cannot be protected by the electronic overcurrent protection.
		(electronic
				Provide a thermal relay in the inverter output circuit.
		overcurrent
		protection)		If a current not less than 150% of the rated output current flows and
	Inv.			overcurrent shut-off (OC) does not occur (200% or less), inverse-time
E.THT			Inverter	characteristics cause the electronic overcurrent protection to be activated
	Overload
				to stop the inverter output. (Overload immunity: 150%, 60 sec)
				At low-speed regions, the operation time may be short.
				If a power failure has occurred in excess of 15msec (this applies also to
				inverter input shut-off), this function is activated to stop the inverter output
				to prevent the control circuit from misoperation. At this time, the alarm
E.IPF	Inst.Pwr.	Instantaneous power failure		output contacts are opened (across B-C) and closed (across A-C).
	Loss	protection		(Note 1) If a power failure persists for more than 100ms, the alarm output
				is not provided, and if the start signal is on at the time of power
				restoration, the inverter will restart. (If a power failure is instantaneous
				within 15msec, the control circuit operates properly.)
				If the inverter power supply voltage drops, the control circuit will not
				operate properly. Furthermore, the motor torque could drop and the heat
E.UVT	Under	Undervoltage protection		generated may increase. The inverter output will be stopped if the power
	Voltage			supply voltage drops to 150V (approx. 300V for 400V class) or less.
				The undervoltage protection function will activate if the DC reactor
				accessory is not used.
E.FIN	H/Sink	Fin overheat		If the cooling fin overheats, the temperature sensor is activated to stop
	O/Temp			the inverter output.

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