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
D
R
Check
point
Check item Check to be done Method Criterion
√
Display
LED and LCD
display
If there is any
abnormal display
Visual check
As per use
state
√
√
Cooling
system
Fan
If abnormal noise or
vibration is produced.
check
No abnormal
sound or
vibration
√
Body
Surrounding
conditions
Temperature,
humidity, dust content,
harmful gas, etc.
Check visually, by
smelling and
feeling
As per
Section 2-1
√
Input/
output
terminal
Voltage
If input, output voltage
is abnormal
Measure at
R, S, T and U, V,
W terminals
As per standard
specifications
Overall conditions
loose, if any signs
show overheat,
discharging, or too
high dust content, or
the air piping is
Check visually,
tighten the
fastenings, and
clean the related
parts
No abnormal
conditions
Electrolytic
capacitance
If there is abnormal
appearance
Check visually
No abnormal
condition
Current-conducting
leads or blocks
If the parts come
loose
Check visually
No abnormal
condition
√
Main
circuit
Terminals
If the screws or bolts
come loose
Tighten the loose
screws or bolts
No abnormal
condition
“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
Section IX. Maintenance
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.
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 Interval for replacement
Cooling fan 1~3 years
Filtering capacitor 4~5 years
PCB (printed circuit board)
5~8 years
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 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.
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