HNC Electric HV590 Series, User Manual

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Section VII. Inspection & Maintenance
7.2 Regular replacement of the device
In order to ensure the operation reliability of the frequency converter, in addition to regular
maintenance and inspection, all the parts suffering long-term mechanical wear should be
replaced at a regular interval, which includes all cooling fans and the filtering capacitors of main
circuits for energy buffer and interchange and PCBs. For continuous use under normal
conditions, these parts can be replaced according to the following table and the operating
environment, loads and the current state of frequency converter.
Part name Standard replacement years
Cooling fan 1~3 years
Filtering capacitor 4~5 years
PCB
(printed circuit board)
5~8 years
7.3 Storage
The following actions must be taken if the frequency converter is not put into use
immediately after delivery to the user and need to keep well for the time being or stored for a
long time
：
※
Stored in a dry and adequately-ventilated place without dust and metal powder at the
temperature specified in the specifications.
※
If the frequency converter is not put into use after one year, a charge test should be made,
so as to resume the performance of the filtering capacitor of main circuit in it. For charging,
a voltage regulator should be used to slowly increase the input voltage of the frequency
converter until it reaches the rating, and the charge should last more than 1~2 hours. This
test should be made at least once a year.
※ Don’t perform breakdown test at random, for this test will cause shorter life of the frequency
converter. The insulation test must be performed after the insulation resistance is measured
with a 500-
volt mega ohm and this value must not be less than 4MΩ.
7.4 Measuring and Judgment
※
If the current is measured with the general instrument, imbalance will exists for the current
at the input terminal. Generally, differing by not more than 10% is normal. If it differs by 30%,
inform the factory to replace the rectification bridge, or check if the error of three-phase
input voltage is above 5V.
※
If the three-phase output voltage is measured with a general multi-meter, the read data is
not accurate due to the interference of carrier frequency and only for reference.
7.5 Safety Precaution
※
Only specially trained persons are allowed to disassembly,replace the drive components.
※
Before the inspection and maintenance,inverter must be confirmed at least 5 minutes after
power off or charged(CHARGE) light is off,otherwise there is risk of electric shock.
※
Avoid metal parts leaving in the drive, or it may result in equipment damage.