Mitsubishi Electric FR-D700 Instruction Manual page 255

Operation panel
E.THM
indication
Name Motor overload trip (electronic thermal relay function) ∗1
The electronic thermal relay function in the inverter detects motor overheat due to overload or reduced cooling
capability during constant-speed operation and pre-alarm (TH display) is output when the integrated value reaches
85% of the Pr. 9 Electronic thermal O/L relay setting and the protection circuit is activated to stop the inverter output
Description
when the integrated value reaches the specified value. When running a special motor such as a multi-pole motor or
multiple motors, provide a thermal relay on the inverter output side since such motor(s) cannot be protected by the
electronic thermal relay function.
1. Check the motor for use under overload.
Check point
2. Check that the setting of Pr. 71 Applied motor for motor selection is correct. (Refer to page 98).
3. Check that stall prevention operation setting is correct.
1. Reduce the load weight.
Corrective action 2. For a constant-torque motor, set the constant-torque motor in Pr. 71 Applied motor.
3. Check that stall prevention operation setting is correct. (Refer to page 74).
∗1
Resetting the inverter initializes the internal thermal integrated data of the electronic thermal relay function.
Operation panel
E.FIN
indication
Name
Fin overheat
If the heatsink overheats, the temperature sensor is actuated and the inverter trips.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink overheat protection
Description operation temperature.
For the terminal used for the FIN signal output, assign the function by setting "26 (positive logic) or 126 (negative
logic)" in Pr. 190 or Pr. 192 (output terminal function selection). (Refer to page 114).
1. Check for too high surrounding air temperature.
2. Check for heatsink clogging.
Check point
3. Check that the cooling fan is not stopped (Check that
1. Set the surrounding air temperature to within the specifications.
Corrective action
2. Clean the heatsink.
3. Replace the cooling fan.
Operation panel
E.ILF
indication
Input phase loss ∗
Name
This fault is output when function valid setting (=1) is set in Pr. 872 Input phase loss protection selection and one phase
Description of the three phase power input is lost. (Refer to page 141).
It may function if phase-to-phase voltage of the three-phase power input becomes largely unbalanced.
Check for a break in the cable for the three-phase power supply input.
Check point
Check that phase-to-phase voltage of the three-phase power input is not largely unbalanced.
Wire the cables properly.
Repair a break portion in the cable.
Corrective action
Check the Pr. 872 Input phase loss protection selection setting.
Set Pr. 872 = "0" (without input phase loss protection) when three-phase input voltage is largely unbalanced.
∗ Available only for three-phase power input specification model.
Operation panel
E.OLT
indication
Name Stall prevention
If the output frequency has fallen to 1Hz by stall prevention operation and remains for 3s, a fault (E.OLT) appears and
Description
trips the inverter. OL appears while stall prevention is being activated.
Check point
Check the motor for use under overload. (Refer to page 75).
Corrective action Reduce the load weight. Check the Pr. 22 Stall prevention operation level setting.
Operation panel
E.BE
indication
Name Brake transistor alarm detection
When a brake transistor alarm has occurred due to the large regenerative energy from the motor etc., the brake
transistor alarm is detected and the inverter trips.
Description
In this case, the inverter must be powered off immediately.
Reduce the load inertia.
Check point Check that the frequency of using the brake is proper.
Check that the brake resistor selected is correct.
Corrective action
Replace the inverter.
Causes and corrective actions
FR-PU04
Motor Ovrload
FR-PU07
FR-PU04
H/Sink O/Temp
FR-PU07
is not displayed on the operation panel).
FR-PU04 Fault 14
FR-PU07 Input phase loss
FR-PU04
Stll Prev STP (OL shown during stall prevention operation)
FR-PU07
FR-PU04
Br. Cct. Fault
FR-PU07
5
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