Protective Functions - Mitsubishi Electric FR-A700 Manual

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.
Function Name
Operation panel lock
Parameter write error
Copy operation error
Error
Stall prevention
(overcurrent)
Stall prevention
(overvoltage)
Regenerative brake
prealarm
Electronic thermal relay
function prealarm
PU stop
Maintenance signal output
Parameter copy
Speed limit display
(output during speed limit)
Fan fault
Overcurrent shutoff during
acceleration
Overcurrent shutoff during
constant speed
Overcurrent shut-off during
deceleration or stop
Regenerative overvoltage
shut-off during acceleration
Regenerative overvoltage
shut-off during constant
speed
Regenerative overvoltage shut-
off during deceleration or stop
Inverter overload shut-off
(Electronic thermal relay
function)
*1
Motor overload shut-off
(Electronic thermal relay
function)
*1
Fin overheat
Instantaneous power failure
protection
Undervoltage protection
Input phase failure
Stall prevention
Brake transistor alarm
detection
Output side earth (ground)
fault overcurrent protection
Output phase failure
protection
External thermal relay
operation
*6
PTC thermistor operation
75
Appears when operation was tried during operation panel lock.
Appears when an error occurred during parameter writing.
Appears when an error occurred during parameter copying.
Appears when the RES signal is on or the PU and inverter can not make normal communication.
Appears during overcurrent stall prevention.
Appears during overvoltage stall prevention. 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 duty value. If the regenerative brake duty reaches 100%, a regenerative overvoltage (E.
OV_) occurs.
Appears when the electronic thermal O/L relay has reached 85% of the specified value.
Appears when on the operation panel was pressed during external operation.
Appears when the cumulative energization time has exceeded the maintenance output timer set
value.
Appears when parameters are copied between models with capacities of 55K or less
and 75K or more.
Display if the speed limit level is exceeded during torque control.
Appears when the cooling fan remains stopped when operation is required or when the speed
has decreased.
Appears when an overcurrent occurred during acceleration.
Appears when an overcurrent occurred during constant speed operation.
Appears when an overcurrent occurred during deceleration and at a stop.
Appears when an overvoltage occurred during acceleration.
Appears when an overvoltage occurred during constant speed operation.
Appears when an overvoltage occurred during deceleration and at a stop.
Appears when the electronic thermal relay function for inverter element protection was activated.
Appears when the electronic thermal relay function for motor protection was activated.
Appears when the heatsink overheated.
Appears when an instantaneous power failure occurred at an input power supply.
Appears when the main circuit DC voltage became low.
Appears if one of the three phases on the inverter input side opened.
Appears when the output frequency drops to 0.5Hz as a result of deceleration due to the excess
motor load.
This function stops the inverter output if an alarm occurs in the brake circuit, e.g. damaged brake
transistors. In this case, the inverter must be powered off immediately.
Appears when an earth (ground) fault occurred on the Inverter's output side.
Appears if one of the three phases on the inverter output side opened.
Appears when the external thermal relay connected to the terminal OH is activated.
Appears when the motor overheat status is detected for 10s or more by the external PTC
thermistor input connected to the terminal AU.
Description Display
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