Chapter 7 – Trouble Shooting & Maintenance
7-14
7.5.3 PeriodicInspection
Inspection Item Inspection
Period
Inspection Method Criterion
Customer
use
Check/
Initial /Date
Monthly
1 year
2 year
Environment
Ambient
Temperature/Humidity
Is the ambient
temperature and humidity
adequate?
X
Measure/Monitor
(Thermometer, Hygrometer,
Recorder)
Temperature:
-10~+40C
Humidity:
Under 90%
non-
condensing
Physical Inspection
Physical
Any signs of physical
damage to the enclosure
of the drive?
X
Visual Yes/No
Any signs of liquid
leaking into enclosure of
the drive?
X
Are there any signs of
rust inside the drive
enclosure?
X
Are there any signs of
rust inside the panel
where the drive is
housed.?
X
Are there any abnormal
vibrations or oscillations
of the drive/Panel?
X
Physical (Cables and
Connections)
Are there any signs of
overheated connections
(discolored lugs,
insulation melted)?
X
Visual Yes/No
Are there any signs of
rusted or corroded
connections?
X
Are there any signs of
cracked terminal blocks?
X
Is there any damage to
cable insulation?
X
Physical (Fans)
Inspect fans and filters
for dust
accumulation/debris.
X
Inspect fans for free
rotation.
X
Non-Powered Drive
Checks/Measurements
IGBT Module
Check the resistance
between each of the
terminals.
X
Disconnect the drive three
phase input and measure the
resistance between R, S, T
and P, N.
Refer to "How
to Check
Power
Components”
using Digital or
Analog meter.
Input Diode/SCR
Modules
Disconnect the drive three
phase output and measure the
resistance between U, V, W
and P, N.
DC Bus Capacitors
Is there any liquid
coming out?
X
Visual check Yes/No
Is the safety pin (pressure
relief) out, or is there any
swelling?
X
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