Power Electronics SD750K, Hardware And Installation Manual

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SD750K POWER ELECTRONICS
92
MAINTENANCE
EN
In
sp
ec
tio
n
si
te
Inspection
element
Inspection
Period
Inspection method Criterion
Instrument of
Measurement
M
on
th
ly
3
mo
nt
hs
2
ye
ar
s
All
Ambient
conditions
Are there dust particles?
Are the ambient
temperature and the
humidity within
specification?
o Visual check
Temperature:
-30 to +50 (or 40ºC)
Humidity: below 95%
non-condensing.
Thermometer,
Hygrometer,
Recorder.
Module
Are there any abnormal
noises or oscillations?
o Visual and audible. There are no anomalies.
Input power
Is the input power to the
main circuit correct?
o
Measure the voltage
between terminals L1, L2, L3
and GND.
Digital
multimeter.
Tester.
Power
connections
Are the Power terminals
correctly fastened?
o
Measure the temperature
and torque of the power
connections
Fasten the bolts again
one week after its start-
up. Check that the
temperature is
homogeneous and below
70ºC
Infrared
thermometer,
Torque key
M
ai
n
ci
rc
ui
t
Conductor/
Cable
Is the conductor
corroded?
Is the sheathing of the
cable damaged?
o
o
Visual check. No anomaly.
Terminal Is any damage visible? o Visual check. No anomaly.
IGBT's module
Diodes module
and Rectifier
Check the resistance
value between each one
of the terminals o
Disconnect the cables of the
inverter and measure the
resistance value between:
L1, L2, L3,

VDC+, VDC-
and
U, V, W
 VDC+, VDC-
with a tester > 10k 
Digital
multimeter.
Analogue
tester.
Correct
capacitor
Have fluid leakages
been observed?
Is the capacitor well
fastened?
Is any dilation or
retraction sign
observed?
Measure the
capacitance
o
o
o Visual check.
Measure the capacitance
with a proper instrument.
No anomaly
Capacitance higher than
85% of rated
capacitance.
Instrument for
measuring
capacity.
Input
Inductances
Is there any liquid leak?
Is there any overheated
point?
o
o
Visual check.
Measure the surface and
connectors’ temperature.
No anomaly.
Check that the
temperature is
homogeneous and below
70ºC
Infrared
thermometer.
Contactor
Is there any contactor
chatter?
Is the contact damaged?
o
o
Audible check.
Visual check. No anomaly.
C
ont
rol
ci
rc
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 i.e.
lower than 8V difference
for 400V models.
Digital
multimeter /
RMS voltage
meter.
C
oo
lin
g
sy
st
em
Cooling fans
Are there any abnormal
noises or oscillations?
Is the cooling fan
disconnected?
o
o
Disconnect the power supply
(OFF) and rotate the fan
manually.
Check the connections.
Fan should rotate
effortlessly.
No anomaly.
Dust filters
Are the dust filters
obstructed?
o Visual check No anomaly