Mitsubishi Electronics FR-F700 Protective Functions, Function Name Description Indication

Protective Functions

When an alarm occurs in the inverter, the protective function is activated bringing the inverter to an alarm stop and the PU display automatically changes to any of the following error (alarm) indications.

Error message *2

Warnings *3

Minor fault *4

Major failures *5

Function Name		Description	Indication
Operation panel lock	Appears when operation is tried during operation panel lock.
Parameter write error	Appears when an error occurs at parameter writing.		to
Copy operation error	Appears when an error occurs at parameter copying.		to
Error	Appears when the RES signal is on or the PU and inverter can not make normal
	communication.
Stall Prevention
	Appears during overcurrent stall prevention.
(overcurrent)
Stall prevention	Appears during overvoltage stall prevention
(overvoltage)	Appears while the regeneration avoidance function is activated.
	Appears if the regenerative brake duty reaches or exceeds 85% of the Pr. 70 "special
Regenerative brake	regenerative brake duty" value. If the regenerative brake duty reaches 100%, a
prealarm	regenerative overvoltage (E. OV_) occurs.
	(displayed only for the 75K or more)
Electronic thermal relay	Appears when the electronic thermal O/L relay has reached 85% of the specified
function prealarm	value.
PU Stop	Appears when	on the operation panel was pressed during external operation.
Maintenance signal output	Appears when the cumulative energization time has exceeded the maintenance
	output timer set value.
Parameter copy	Appears when parameters are copied between models with capacities of 55K or
	less and 75K or more.
Fan fault	Appears when the cooling fan remains stopped when operation is required or when the speed
	has decreased.
Overcurrent shut-off during	Appears when an overcurrent occurred during acceleration.
acceleration
Overcurrent shut-off during	Appears when an overcurrent occurred during constant speed operation.
constant speed
Overcurrent shut-off during	Appears when an overcurrent occurred during deceleration and at a stop.
deceleration or stop
Regenerative overvoltage	Appears when an overvoltage occurred during acceleration.
shutoff during acceleration
Regenerative overvoltage
shut-off during constant	Appears when an overvoltage occurred during constant speed operation.
speed
Regenerative overvoltage shut-	Appears when an overvoltage occurred during deceleration and at a stop.
off during deceleration or stop
Inverter overload shut-off	Appears when the electronic thermal relay function for inverter element protection
(electronic thermal relay
	was activated.
function)*1
Motor overload shut-off	Appears when the electronic thermal relay function for motor protection was
(electronic thermal relay
	activated.
function)*1
Fin overheat	Appears when the heatsink overheated.
Instantaneous power failure	Appears when an instantaneous power failure occurred at an input power supply.
protection
Undervoltage protection	Appears when the main circuit DC voltage became low.
Input phase failure	Appears if one of the three phases on the inverter input side opened.
Stall prevention	Appears when the output frequency drops to 0.5Hz as a result of deceleration due to
	the excess motor load.
Output side earth (ground)	Appears when an earth (ground) fault occurred on the inverter's output side.
fault overcurrent protection
Output phase failure	Appears if one of the three phases on the inverter output side opened.
protection
External thermal relay	Appears when the external thermal relay connected to the terminal OH operated.
operation *6
PTC thermistor operation	Appears when the motor overheat status is detected for 10s or more by the external
	PTC thermistor input connected to the terminal AU.
	Appears when an alarm occurred in the option card or an AC power supply is
Option alarm	connected to the R/L1, S/L2, T/L3 when the high power factor converter connection
	is set.
Option slot alarm	Appears when a communication error occurred in the communication option.
Option alarm	Appears when a functional error occurred in the plug-in option.
Parameter storage devide	Appears when operation of the element where parameters are stored became
alarm	abnormal. (control circuit board)

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