Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 260

Operation panel
SA
indication
Name SA
Description Appears when the shorting wire across the terminals S1 and SC or the terminals S2 and SC is disconnected.
Check point Check if the shorting wire across the terminals S1 and SC or the terminals S2 and SC is disconnected.
Corrective action
Short across the terminals S1 and SC and the terminals S2 and SC with shortening wires.
(3) Alarm
When an alarm occurs, the output is not shut off. You can also output an alarm signal by making parameter setting.
(Set "98" in Pr. 190 or Pr. 192 (output terminal function selection). Refer to page 123.)
Operation panel
FN
indication
Name
Fan alarm
For the drive unit that contains a cooling fan,
Description
an alarm or different operation from the setting of Pr. 244 Cooling fan operation selection.
Check point Check the cooling fan for an alarm.
Corrective action Check for fan alarm. Please contact your sales representative.
(4) Fault
When a fault occurs, the drive unit trips and a fault signal is output.
Operation panel
E.OC1
indication
Name Overcurrent trip during acceleration
When the drive unit's output current reaches or exceeds approximately 200% of it's rated current or approximately
Description
250% of the rated motor current during acceleration, the protective circuit is activated and the drive unit trips.
 Check for sudden acceleration.
 Check that the downward acceleration time is not long for the lift.
 Check for output short-circuit/ground fault.
Check point
 Check if the stall prevention operation level is set too high.
 Check that the drive unit capacity matches with the motor capacity.
 Check if a start command is given to the drive unit while the motor is coasting.
 Increase the acceleration time. (Shorten the downward acceleration time for the lift.)
 When "E.OC1" is always lit at starting, disconnect the motor once and start the drive unit.
If "E.OC1" is still lit, contact your sales representative.
Corrective action
 Check the wiring to make sure that output short circuit/ground fault does not occur.
 Lower the setting of stall prevention operation level (refer to page 83).
 Choose drive unit and motor capacities that match.
 Input a start command after the motor stops.
Operation panel
E.OC2
indication
Name
Overcurrent trip during constant speed
When the drive unit's output current reaches or exceeds approximately 200% of it's rated current or approximately
Description
250% of the rated motor current during constant-speed operation, the protective circuit is activated and the drive unit
trips.
 Check for sudden load change.
 Check for output short-circuit/ground fault.
Check point  Check if the stall prevention operation level is set too high.
 Check that the drive unit capacity matches with the motor capacity.
 Check if a start command is given to the drive unit while the motor is coasting.
 Keep load stable.
 Check the wiring to make sure that output short circuit/ground fault does not occur.
Corrective action
 Lower the setting of stall prevention operation level (refer to page 83).
 Choose drive unit and motor capacities that match.
 Input a start command after the motor stops.
Causes and corrective actions
FR-PU07 ——
FR-PU04
FN
FR-PU07
appears on the operation panel when the cooling fan stops due to
FR-PU07 OC During Acc
FR-PU07 Stedy Spd OC
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