Protective Functions - Mitsubishi Electric FR-F700PJ Series 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
Password locked
Parameter write error
Inverter reset
Stall prevention
(overcurrent)
Stall prevention
(overvoltage)
Regenerative brake
pre-alarm

Electronic thermal relay
function pre-alarm
PU stop
Maintenance signal
output

Undervoltage
SA
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)

Heatsink overheat
Undervoltage

Input phase loss
 
Stall prevention stop
Loss of synchronism
detection

Brake transistor
alarm detection/
internal circuit fault
Output side earth
(ground) fault
overcurrent at start

Output phase loss
Appears when operation is tried during operation panel lock.
Appears when a password restricted parameter is read/written.
Appears when an error occurs at parameter writing.
Appears when the RES signal is ON during the inverter reset.
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 voltage at the main circuit power supply is low.
Appears when the shorting wire across the terminals S1 and SC or the terminals S2 and SC is disconnected.
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.
This function is activated when the restart operation is repeatedly unsuccessful because the power supply
voltage of the inverter has dropped.
Appears if one of the three phases on the inverter's input side is lost. It may also appear when the input
powers to the three phases are largely unbalanced.
Appears when the output frequency drops to 1Hz (1.5Hz under IPM motor control) due to the deceleration
with an overloaded motor.
Appears when the operation is not synchronized.
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. (Detected 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.
Description Indication
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