SDRIVE 700
POWER ELECTRONICS
104
FAULT MESSAGES. DESCRIPTIONS AND ACTIONS
11.3.3.
Daily and periodic inspections
Note:
Long life of the main components above indicated is based on a continuous operation for the stipulated load.
These conditions can change according to the environment conditions.
Period
In
specti
on
si
te
Inspection
element
Inspection
Da
ily
1 year
2 year
s
Inspection method
Criterion
Instrument of
Measurement
Ambient
conditions
Are there dust particles?
Are the ambient
temperature and the
humidity within
specification?
o
See “Warnings”
Temperature:
-30 to +50
Humidity: below 95% non-
condensing.
Thermometer,
Hygrometer,
Recorder.
Module
Are there any abnormal
noises or oscillations?
o
Visual and audible.
There are no anomalies.
All
Input power
Is the input power to the
main circuit correct?
o
Measure the voltage between
terminals R, S, T and N.
Digital
multimeter.
Tester.
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:
R, S, T
Ù
VDC+, VDC-
and
U, V, W
Ù
VDC+, VDC-
with a tester > 10k
Ω
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
Higher than 85% of rated
capacitance.
Instrument for
measuring
capacity.
Ma
in
c
irc
ui
t
Contactor
Is there any contactor
chatter?
Is the contact damaged?
o
o
Audible check.
Visual check.
No anomaly.
C
ontr
ol
ci
rcu
it a
nd
Pr
ote
ct
io
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.
Cool
ing
system
Cooling fan
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.
Di
spl
ay
Measurement
Is the displayed value
correct?
o o
Check the reading instrument
with an external
measurement.
Check the specified
values and the control
values.
Voltage meter /
Current meter
etc.
All
Is there any noise or
abnormal vibrations?
Has any unusual smell
been perceived?
o
o
Audible, sensory and visual
check.
Check if damages have been
produced by overheating.
No anomaly.
Motor
Insulation
resistance
Megger check (between
terminals of output circuit
and ground terminal)
o
Disconnect the cables U, V
and W and join them
together. Check the
resistance between this join
and ground.
More than 5M
Ω
Megger type
500V
