MITSUBISHI ELECTRIC FR-A500L - Manual (Page 42)

PROTECTIVE FUNCTIONS
31
Operation Panel
Display
Check Point Remedy
Brake unit
cooling fin
overheating
Is the usage frequency of the brake
unit appropriate?
Are the cooling fins clogged?
Is there any error in the inverter unit
cooling fan? Reduce the load GD 2 . Reduce the braking frequency.
Clean the cooling fins.
Replace the cooling fan.
Control board
ambient
temperature
error
Is there an error in the cooling fan?
Is the ambient temperature too
high?
Replace the cooling fan.
Keep the ambient temperature within the
specifications.
Output over
current
Is there an output short circuit or
ground fault? (Check the motor
winding and insulation resistance.)
Was rapid acceleration attempted?
Did the load fluctuate suddenly?
Was rapid deceleration attempted?
Were the motor's mechanical
brakes applied too quickly? Repair the output short circuit and ground fault.
(Repair or replace the motor.)
Lengthen the deceleration time.
Eliminate the sudden fluctuate in the load.
Lengthen the deceleration time.
Investigate the braking operation.
Cooling fan
power supply
error
Is the cooling fan's power supply
output short circuited?
Is the cooling fan's power supply
abnormal?
Is the fuse blown? Repair the short-circuited section.
Replace the cooling fan power supply.
Replace the fuse.
Capacitor
overcurrent
Is the DC circuit short circuited?
Is there an output short circuit or
ground fault? (Check the motor
winding and insulation resistance.)
Repair the short-circuited section, and replace the DC
fuse.
Repair the output short circuit and ground fault.
(Repair or replace the motor.)
Cooling fin
overheat
Is there an error in the cooling fan?
Are the cooling fins clogged?
Is the ambient temperature too
high?
Replace the cooling fan.
Clean the cooling fins.
Keep the ambient temperature within the
specifications.
E.15
Gate power
supply error
Is the gate output short circuited?
Is there an error in the control power
supply board?
Repair the short-circuited section.
Replace the control power supply board.
zWhen the protective function is activated, take proper corrective action, reset the inverter, then resume
operation.