Maintenance
V260 Series High Performance Closed-Loop Vector Inverter User Manual
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9.2 INSPECTION AND DISPLACEMENT OF THE VULNERABLE
COMPONENTS
During operation, some components of frequency inverter may wear or the performance is slowed down. In
order to ensure the stable reliable operation of frequency inverter, the users shall carry out preventative
maintenance for frequency inverter, and replace the components when necessary.
9.2.1 FILTER CAPACITOR
Possible cause of damage: Environmental temperature and the pulsating current are high, and electrolyte is
aging.
Assessment criterion: When frequency inverter operate with load, uses check whether there occur fault such
as over current, over voltage; whether liquid leaks out, whether the relief valve bulge; whether the
determination of electrostatic capacitive and insulation resistance are abnormal.
The pulsating current of main loop would affect the performance of the aluminum electrolysis filter capacitor,
and the degree of influence depends on the environment temperature and the using conditions. Replace
electrolytic capacitors of frequency inverter every three to four years under normal conditions.
Filter capacitor shall be replaced immediately if any of the following occurs: electrolyte of the electrolyte
capacitor leaks, relief valve emits out, and subject of the capacitor expands.
9.2.2 COOLING FAN
Possible cause of damage: Bearing wear, leaf aging.
Assessment criterion: When the power of frequency inverter is cut out, check the fan blades and other parts
to see whether there is any abnormality such as crack. With the power on, just check whether the fan
operation situation is normal, and whether it has abnormal vibration and noise.
Service life of the entire cooling fan in frequency converter is about 15000 hours (i.e. frequency inverter use
continuously for about two years), if the fan has unusual voice or vibration, it should be replaced immediately.
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Electrical insulation experiment of frequency inverters has been conducted before
leaving the factory, and users do not need to conduct the compression test again, or the
internal components could be damaged.
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If the frequency inverter is required to undergo the insulation testing, just make sure that
all the input and output terminals connected in a reliable way. For a single terminal,
insulation testing is strictly prohibited and conduct the test with 500V tramegger
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Do not use tramegger to measure the control circuit. As the frequency inverter has
internal static sensitive element, the direct touch is therefore prohibited.
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When conducting the insulation testing for the generator, remove the connection line
between generator and the frequency inverter.
