module is damaged.
If measuring is necessary, the user should note that much different results will be gained
possibly if the measuring is performed with different instruments. It is recommended that the input
voltage be measured with pointer-type voltmeter, output voltage with rectification voltmeter, input
and output current with tong-test ammeter, and power with electrically-driven wattmeter.
8-2. Periodically-Replaced Parts
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.
8-3. 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 megaohm and this value must not be less than 4MΩ.
8-4. 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 reading is not
accurate due to the interference of carrier frequency and only for reference.
To Next Page
Loading...
Need help?
General
