
Upkeep, Maintenance and After-Sales Service
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5. Clean away dust on the circuit board and the air duct thoroughly. A dust cleaner is
recommended;
6. If an inverter is to be stored for long, it must be subject to a 5-hour energizing test within 2
years. During the energizing test, step up the voltage slowly to a rated value with a voltage
regulator. Loads may be dropped.
CAUTION: If an insulation test is required for the motor, the motor must be disconnected from
the inverter and be subjected to an independent test; otherwise the inverter may be damaged.
CAUTION: Do not conduct withstanding voltage tests or insulation tests on the control loop;
otherwise electrical circuit elements may be damaged.
8.3. Replacement of Inverter Wearing Parts
The inverter wearing parts primarily include the electrolytic capacitor (used for wave filtration) and the
cooling fan. The service life and the service environment are closely related to maintenance conditions.
The user can decide whether to change the wearing parts according to the operating time.
Cooling Fan
Possible Cause for Damage: Bearing abrasion and blade aging (the fan life is normally
30,000—40,000 hours);
Judgment Criterion: Cracks on fan blades; abnormal vibration noise during startup.
NOTE:
1. The replacement must be a fan of the same specification (rated voltage, current, rotation speed
and air volume) as recommended by the manufacturer;
2. During installation, see to it that the indicated direction of the fan must be the same as the
blasting direction.
3. Remember to install a protective hood.
Wave-Filtering Electrolytic Capacitor
Possible Cause for Damage: As the ambient temperature is high, the frequent load jumps causes
the pulsating current to increase in intensity; therefore the electrolyte ages and deteriorates.
Judgment Criterion: Liquid leak, bulged safety valve, electrostatic capacity measurement and
insulation resistance measurement.
It is recommended that the busbar electrolytic capacitor be replaced every 4 or 5 years.
8.4. Storage of Inverters
After purchasing the inverter, the user must advert to the following points on temporary/longtime
storage:
Avoid storage in high-temperature, high-humidity environments filled with dust and metal dust;
Longtime storage will cause the electrolytic capacitor to deteriorate. The inverter must be
charged at least once every two years for a min. of 5 hours. User a voltage regulator to step up the
input voltage slowly to the rated voltage.