Mitsubishi Electric FR-D720-0.2K-G, Instruction Manual

Page: 260 / 302

257
5
TROUBLES
HOOTING
Causes and corrective actions
(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.
)
(4) Fault
When a fault occurs, the drive unit trips and a fault signal is output.
Operation panel
indication
SA FR-PU07 ——
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.
Operation panel
indication
FN
FR-PU04
FR-PU07
FN
Name
Fan alarm
Description
For the drive unit that contains a cooling fan, appears on the operation panel when the cooling fan stops due to
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.
Operation panel
indication
E.OC1 FR-PU07 OC During Acc
Name Overcurrent trip during acceleration
Description
When the drive unit's output current reaches or exceeds approximately 200% of it's rated current or approximately
250% of the rated motor current during acceleration, the protective circuit is activated and the drive unit trips.
Check point
 Check for sudden acceleration.
 Check that the downward acceleration time is not long for the lift.
 Check for output short-circuit/ground fault.
 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.
Corrective action
 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.
 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
indication
E.OC2 FR-PU07 Stedy Spd OC
Name
Overcurrent trip during constant speed
Description
When the drive unit's output current reaches or exceeds approximately 200% of it's rated current or approximately
250% of the rated motor current during constant-speed operation, the protective circuit is activated and the drive unit
trips.
Check point
 Check for sudden load change.
 Check for output short-circuit/ground fault.

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.
Corrective action
 Keep load stable.
 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.