Chapter 9 Maintenance and Repair
201
The different instruments may come to different measurement results when
measuring. It is recommended that the pointer voltmeter shall be used for measuring
input voltage, the rectifier voltmeter for output voltage, the clamp-on ammeter for input
current and output current, and the electric wattmeter for power.
9-2.Parts for regular replacement
To ensure the reliable operation of inverter, in addition to regular care and
maintenance, some internal mechanical wear parts(including cooling fan, filtering
capacitor of main circuit for energy storage and exchange, and printed circuit board)
shall be regularly replaced. Use and replacement for such parts shall follow the
provisions of below table, also depend on the specific application environment, load and
current status of inverter.
Printed circuit board(PCB)
9-3.Storage
The following actions must be taken if the inverter is not put into use
immediately(temporary or long-term storage) after purchasing:
※ It should be store at a well-ventilated site without damp, dust or metal dust, and
the ambient temperature complies with the range stipulated by standard
specification
※ Voltage withstand test can not be arbitrarily implemented, it will reduce the life of
inverter. Insulation test can be made with the 500-volt megger before using, the
insulation resistance shall not be less than 4MΩ.
9-4.Capacitor
9-4-1.Capacitor rebuilt
※ If the frequency inverter hasn‟t been used for a long time, before using it please
rebuilt the DC bus capacitor according the instruction. The storage time is counted
from delivery.
Before the first time to use, the frequency inverter must be
recharged for one hour
Use adjustable power to charge the frequency inverter:
--25% rated power 30 minutes,
-- 50% rated power 30minutes,
-- 75% rated power 30minutes,
--Last 100% rated power 30minutes,
Use adjustable power to charge the frequency inverter:
--25% rated power 2hours,
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