Inspection And Maintenance; Periodically-Replaced Parts; Storage; Measuring And Judgment - Powtran PI7800 User Manual

Section IX. Maintenance

9-1 Inspection and Maintenance

Under normal working conditions,in addition to daily inspection, the frequency
converter should be subject to regular inspection (for example inspection for
overhaul or as specified but at an interval of six months at most). Please refer to
the following table in order to prevent faults.
Check time
Check
Check item
point
D R
LED and LCD
√ Display
display
Cooling
√ √ Fan
system
Surrounding
√ Body
conditions
Input/
output
√ Voltage
terminal
Overall conditions
Main
√
Electrolytic
circuit
capacitance
Current-conducting
leads or blocks
Terminals
"D" means daily check and "R" means regularly check.
"√" means need daily check or regularly check
For inspection, do not disassemble or shake the parts without reason, and still
less pull off the plug-in-parts at random. Otherwise, the unit will not operate
normally, or can not enter the mode of fault display, or causes faults of
components or even parts of the main switch components IGBT 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.
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Check to be done Method Criterion
If there is any abnormal As per use
Visual check
display state
No abnormal
If abnormal noise or Visual and audible
sound or
vibration is produced. check
vibration
Temperature, humidity, Check visually, by
As per Section
dust content, harmful smelling and
gas, etc. feeling
Measure at
If input, output voltage As per standard
R, S, T and U, V,
is abnormal specifications
W terminals
If the fastenings come
Check visually,
loose, if any signs show
tighten the
overheat, discharging, No abnormal
fastenings, and
or too high dust conditions
clean the related
content, or the air
parts
piping is blocked
If there is abnormal No abnormal
Check visually
appearance condition
No abnormal
If the parts come loose Check visually
condition
If the screws or bolts Tighten the loose No abnormal
come loose screws or bolts condition
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S IX. M
ECTION AINTENANCE

9-2. 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.
Part name
Cooling fan
Filtering capacitor
PCB (printed circuit board)

9-3. 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
2-1
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.

9-4. 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.
Interval for replacement
1~3 years
4~5 years
5~8 years
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