Protective Functions - Mitsubishi Electric FR-E700EX Manual

Protective Functions

When a fault occurs, the drive unit trips and the PU display automatically changes to one of the following fault or alarm indications.
The error message shows an operational error. It does not trip the drive unit.
Warnings are messages given before faults occur. It does not trip the drive unit.
When a fault occurs, a protective function is activated to trip a drive unit and output a fault signal.
Function Name
Operation panel lock
Password locked
Parameter write error
Drive unit reset
During torque limit
Stall prevention
Regenerative brake prealarm
Electronic thermal relay function
prealarm 
PU stop
Maintenance signal output
Home position return error
Undervoltage
Overcurrent trip during acceleration
Overcurrent trip during constant
speed
Overcurrent trip during
deceleration or stop
Regenerative overvoltage trip
during acceleration
Regenerative overvoltage trip
during constant speed
Regenerative overvoltage trip
during deceleration or stop
Drive unit overload trip
(electronic thermal relay function)
Motor overload trip (electronic
thermal relay function) 
Fin overheat
Input phase loss 
Stop by the torque limit
Loss of synchronism detection
Brake transistor alarm detection
Output side earth (ground) fault
overcurrent

Output phase loss
External thermal relay operation
Option fault
Communication option fault
Option fault
Parameter storage device fault
Internal board fault
PU disconnection
Retry count excess 
CPU fault
Inrush current limit circuit fault
Analog input fault
Overspeed occurrence
Speed deviation excess detection
Excessive position error
Acceleration rate error
USB communication fault
Internal circuit fault

Resetting the drive unit initializes the internal thermal integrated data of the electronic thermal relay function.

This protective function does not function in the initial status.
Appears when operation was tried during operation panel lock.
Password function is active. Display and setting of parameter is restricted.
Appears when an error occurred during parameter writing.
Appears when the RES signal is on.
Appears while the torque limit operation is being performed.
Appears while the stall prevention or regeneration avoidance function is being performed.
 Appears if the regenerative brake duty reaches or exceeds 85% of the Pr.70 Special regenerative brake duty value.
Appears if the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of the preset
level of Pr.9 Electronic thermal O/L relay.
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 an error occurs during the home position return operation under position control.
Appears when the main circuit power became low voltage.
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 drive unit element protection was activated.

Appears when the electronic thermal relay function for motor protection was activated.
Appears when the heatsink overheated.
Appears if one of the three phases on the drive unit's input side is lost. It may also appear when the input
powers to the three phases are largely unbalanced.
Appears when the rotation speed drops to 18r/min as a result of deceleration due to the excess motor load.
Appears when the operation is not synchronized or is performed with no motor connected.
This function stops the drive unit output if an alarm occurs in the brake circuit, e.g. damaged brake
transistors. In this case, the drive unit must be powered off immediately.
Appears when an earth (ground) fault occurred on the drive unit's output side. (detects only at a start)
While the drive unit is running, the drive unit trips if one of the three phases (U, V, and W) on the output
side of the drive unit is lost.
 Appears when the external thermal relay connected to the terminal OH operated.
Appears when a communication option is connected while Pr.296 Password lock level ="0 or 100".
Appears when a communication line error occurs in the communication option.
Appears when a contact fault or the like of the connector between the drive unit and plug-in option occurs.
Appears when operation of the element where parameters stored became abnormal. (control board)
When a combination of control board and main circuit board is wrong, the drive unit is tripped.
Appears when a communication error between the PU and drive unit occurred, the communication interval
exceeded the permissible time during the RS-485 communication with the PU connector, or
communication errors exceeded the number of retries during the RS-485 communication.
Appears when the operation was not restarted within the set number of retries.
Appears during the CPU and peripheral circuit errors occurred.
Appears when the resistor of the inrush current limit circuit overheated.
Appears if voltage(current) is input to terminal 4 when the setting in Pr.267 Terminal 4 input selection and the
setting of voltage/current input switch are different.
Appears when the motor rotation speed exceeds the setting of Pr.374 Overspeed detection level.
Appears when the difference between the commanded speed and the motor rotation speed stays greater
than the Pr.285 Excessive speed deviation detection speed setting for the time set in Pr.853 Speed deviation time.
Appears when the difference between the position command (before the electronic gear) and the current
position (after the electronic gear) has exceeded the Pr.427 Excessive level error under position control.
Appears when the acceleration rate of the motor rotation speed has exceeded the setting of Pr.375 Faulty
acceleration rate detection level.
Appears when the communication has been disconnected for the time set in Pr.548 USB communication check time interval.
Appears when an internal circuit error occurred.
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