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Chapter 8 Inverter Inspection and Maintenance
8.2 Replacement of Wearing Parts
The wearing parts of inverter mainly include cooling fan and filter electrolytic
capacitor. Usually, a cooling fan's service life is 20,000~30,000 hours and
an electrolytic capacitor's service life is 40,000~50,000 hours. User can
decide when to replace these parts according to the corresponding operation
time.
1. Cooling Fan
It is advisory to replace the fan when abnormal noise or even vibration
occurred to the fan due to bearing wear and fan blade aging. The standard
replacement age is 2~3 years.
2 Filter Electrolytic Capacitor
The performance of filt er electrolytic capacitor is subject to the pulsating
current of main circuit. High ambient temperature or frequent load jump
may cause damage to the filter electrolytic capacitor. Generally, every
10
rise in temperature may lead to reduction of capacitor's service life
by half(as shown in Fig.8-1).if there is any electrolytic leakage of safety
valve emission. Just replace it at once, the standard replacement age for
electrolytic capacitor is 4~5 years
Ambient temperature
Running 12 hours per day
Fig. 8-1 Capacitor Life Curve
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Capacitor life (years)
Chapter 8 Inverter Inspection and Maintenance
3. The above replacement duration for inverter's wearing parts is applied
to the following conditions:
Ambient Temperature:30 averagely all year round;
Load Proportion: <85%;
Operation Time:
12h/day.
If used beyond the above mentioned range, the service life of the inverter's
wearing parts will minimize.
8.3 Storage of Inverter
Please pay attention to the following points if an inverter is set aside or
stored for a short/long time:
DO not keep the inverter in a place with high temperature,
humidity, heavy dust, and metal shavings, corrosive gas
and vibration, and ensure good ventilation.
Long-term idle of the inverter may cause decreasing in
filter characteristic of the electrolytic capacitor. So it
should be recharged within half a year and the recharging
period should be at least 5 hours.
DO raise the voltage gradually by using a voltage regular
CAUTION
or to some rated value before it is recharged. At the same
time, check whether the inverter's function is normal or
not, whether there is a short circuit caused by some
problems. In case the above problems occur. just remove
or seek service as soon as possible.
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