Mitsubishi Electronics FR-A500L instruction manual Errors Alarms, Error alarm definitions

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
Operatio		Paramete
n Panel
		r Unit	Name		Description
Display
		(FR-PU04)
(FR-DU04)
E.OC1		OC During	During
		Acc	acceleration
		Stedy Spd	During		When the inverter output current reaches or exceeds approx. 200% of
E.OC2			constant	Overcurrent
		OC			the rated current, the protective circuit is activated to stop the inverter
			speed	shut-off
					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
		Overload
					activated 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
		Inst.Pwr.	Instantaneous power failure		alarm output contacts are opened (across B-C) and closed (across A-
E.IPF					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
		Under			generated may increase. The inverter	output will be stopped if the
E.UVT			Undervoltage protection		power supply voltage drops to 150V (approx. 300V for 400V class) or
		Voltage
					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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