5 Maintenance and Repair
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Inspection
Item
Inspection Point Solution upon Fault Checked
Load
Inspect whether the
running current of
the AC drive exceeds
the rated current
of the AC drive and
motor for a certain
period.
Check whether motor parameters are set
correctly.
Check whether the motor is overloaded.
Check for mechanical vibration (< 0.6 g on normal
condition).
□
Input voltage
Inspect whether the
power voltage of the
main and control
circuits is within the
allowed range.
Check that the input voltage is within the allowed
range (323–528 VAC).
Check whether heavy load starts.
□
5.3 Periodic Inspection
5.3.1 Periodic Inspection Items
Always keep the AC drive clean. Clear away dusts especially metal powder on the
surface of the AC drive, to prevent dust from entering the AC drive. Clear oil dirt from the
cooling fan of the AC drive.
Inspection
Item
Inspection Point Inspection Details Checked
General
Inspect for wastes, dirt and dust
on the surface of the AC drive.
Check whether the cabinet of the AC
drive is powered o.
Use a vacuum cleaner to suck up wastes
and dust to prevent direct touching.
Wipe stubborn stains with alcohol and
wait until the alcohol evaporates.
□
Cables
Inspect power cables and
connections for discoloration.
Inspect wiring insulation for
aging or wear.
Replace cracked cables.
Replace damaged terminals.
□
Peripheral
devices
such as
relay and
contactor
Inspect contactors and relays
for excessive noise during
operation.
Inspect for short-circuit, water
stain, expansion, or cracking on
peripheral devices.
Replace abnormal peripheral devices. □
Ventilation
Inspect whether the air lter
and heatsink are clogged.
Check whether the fan is
damaged.
Clean the air lter.
Replace the fan.
□
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