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7. Maintenance and inspection
General-purpose inverters are stationary equipment in which semi-
conductor elements are used. Daily inspection is necessary to pre-
vent unexpected nonconformance due to the influence of operating
environment (temperature, humidity, dust, vibration, etc.), secular
change of parts, and service life.
7-1 Precautions as to maintenance and inspection
(1) The operator himself shall turn on or off the power to prevent
improper operation by any person not concerned.
(2) After the power is turned off, the internal circuit remains charged
by high voltage. Turn off the power and wait for some time (more
than one minute) after the LED on the operation panel has gone
out before inspection.
7-2 Inspection item and period
Conduct daily inspection and periodical inspection as follows:
Note: The inspection period may change when the operating condi-
tion differs during periodical inspection.
6-2. Resetting when protective function is activated
Reset the protective function by any one of the following methods.
1. Turn off the input power.
2. Set the operation stop switch on the front panel in the STOP posi-
tion.
3. Set the external control terminal “RUN” in the STOP (OFF) position.
4. Transmit the Reset command when RS-485 is used.
Classifi-
cation
Daily
inspection
Periodical
inspection
Inspection
period
Every day
One year
Inspection item
Check the ambient temperature, humidity, dust,
foreign substances, etc.
Is there any abnormal vibration and sound?
Is the main circuit voltage normal?
Is there any foul smell?
Cleaned state of the operation section.
Megohmmeter test (between main circuit ter-
minal and grounding terminal)
Is the tightened section loosened?
Is there any trace of overheating?
Is the output voltage of each phase unbalanced
because of single inverter operation?
Is the terminal block damaged?
CAUTION
!
Summary of Contents for CAI40C
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