Protective Functions - Mitsubishi Electric FR-D700 Manual

Protective Functions

When a fault occurs, the inverter trips and the PU display automatically changes to any of the following fault or alarm indications.
Function Name
Operation panel lock
Password locked
Parameter write error
Inverter reset
Stall prevention (overcurrent)
Stall prevention (overvoltage)
Regenerative brake prealarm ∗7
Electronic thermal relay function prealarm
PU stop
Maintenance signal output ∗7
Undervoltage
Fan alarm
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
Inverter overload trip
(electronic thermal relay function)
Motor overload trip
(electronic thermal relay function) ∗1
Fin overheat
Input phase loss ∗7 ∗8∗9
Stall prevention
Brake transistor alarm detection
Output side earth (ground) fault
overcurrent at start ∗7
Output phase loss
External thermal relay operation∗6 ∗7 Appears when the external thermal relay connected to the OH signal was activated.
PTC thermistor operation ∗7
Parameter storage device fault
PU disconnection
Retry count excess ∗7
CPU fault
Output current detection value
exceeded ∗7
Inrush current limit circuit fault
Analog input fault
Safety circuit fault
∗1 Resetting the inverter initializes the internal thermal integrated data of the electronic thermal relay function.
∗2 The error message shows an operational error. The inverter output is not shut off.
∗3 Warnings are messages given before fault occur. The inverter output is not shut off.
∗4 Alarms warn the operator of failures with output signals. The inverter output is not shut off.
∗5 When faults occur, the protective functions are activated to inverter trip and output the fault signals.
∗6 The external thermal operates only when the OH signal is set in Pr. 178 to Pr. 182 (input terminal function selection).
∗7 This protective function does not function in the initial status.
∗8 Protective function activates when Pr.872 Input phase loss protection selection = "1".
∗9 This protective function is available with the three-phase power input specification model only.
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Appears when operation was tried during operation panel lock.
Appears when a password restricted parameter is read/written.
Appears when an error occurred during parameter writing.
Appears when the RES signal is on.
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 the main circuit power became low voltage.
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 if one of the three phases on the inverter input side opened. It may function if phase-to-
phase voltage of the three-phase power input becomes largely unbalanced.
Appears when the output frequency drops to 1Hz 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. (detects only at a start)
If one of the three phases (U, V, W) on the inverter's output side (load side) is lost during inverter
operation (except during DC injection brake operation and when output frequency is under 1Hz),
inverter stops the output.
Appears when resistance of PTC thermistor connected between terminal 2 and terminal 10 is more
than the value set in Pr. 561 PTC thermistor protection level.
Appears when operation of the element where parameters stored became abnormal. (control board)
Appears when a communication error between the PU and inverter 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 output current exceeded the output current detection level set by the parameter.
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 safety circuit is malfunctioning.
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