SD300
POWER ELECTRONICS
88
MAINTENANCE
Ins
pe
ction
s
ite
Inspection
Period
Inspection
method
Criterion
Measurement
instrument
M
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1
ye
ar
2
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ar
s
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t
CONDUCTOR / CABLE
Is the conductor
corroded?
Is the cable shield
damaged?
o
o
Visual check.
No anomaly.
TERMINAL
Is there any visible
damage?
o
Visual check.
No anomaly.
CORRECT CAPACITOR
Have fluid leakages
been observed?
Is the capacitor well
fastened?
Are there any signs of
dilation or retraction?
o
o
o
Visual check.
Measure the
capacitance with
a proper
instrument.
No anomalies.
Capacitance
higher than 85%
of rated
capacitance.
Instrument for
measuring
capacity.
CONTACTOR
Is there any contactor
chatter?
Is the contact
damaged?
o
o
Audible check.
Visual check.
No anomaly.
OPTIONAL BRAKING RESISTOR
Is there any damage
from resistance?
o
Visual inspection. No anomaly.
Digital
multimeter /
analog tester
Check for disconnection
o
Disconnect one
side and
measure with a
tester.
Must be /-
10% of the rated
value of the
resistor.
C
ontr
ol
c
irc
ui
t a
nd
Pr
ote
ctio
ns
OPERATING CHECK
Is there any imbalance
between output voltage
phases?
o
Measure voltage
between output
terminals U, V
and W.
Balanced voltage
between phases. Digital
multimeter /
RMS voltage
meter.
Are there any errors in
the display circuit after
the sequence protection
test?
o
Test the drive
output protection
in short and open
circuit conditions.
The circuit must
work according to
the sequence.
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