8-1
8. Maintenance and Inspection
Perform daily and periodic inspection to avoid trouble and keep reliable operation for a long time. Take
care of the following items during work.
8-1 Daily Inspection
Visually inspect errors in the state of operation from the outside without removing covers while the
inverter operates or while it is turned on.
1) Check if the expected performance (satisfying the standard specification) is obtained.
2) Check if the surrounding environment satisfies the standard specification.
3) Check that the display of the keypad panel is free from errors.
4) Check for abnormal noise, excessive vibration and bad smell.
5) Check for traces of overheat, discoloration and other defects.
8-2 Periodic Inspection
After stopping the operation, turn the power off and remove the front cover to perform periodic inspection.
The smoothing capacitor at the DC section of the main circuit takes time to be discharged after the power
is turned off. After checking that the charge lamp (CRG) is unlit, check that the DC voltage is lower than
the safety level (25 VDC) using a multimeter or the like before starting work.
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WARNING
• Turn the power off and wait for at least five minutes before starting inspection.
(Further, check that the charge lamp is unlit and measure the DC voltage across the
P (+) and N (-) terminals to check that it is lower than 25V.)
Otherwise electric shock could occur.
• Maintenance and inspection and parts replacement should be made only by
appointed persons.
(Take off the watch, rings and other metallic matter before starting work.)
(Use insulated tools.)
• Never remodel.
Otherwise electric shock or injuries could occur.
Table 8-2-1 List of periodic inspection
Check part Check item How to inspect Evaluation criteria
Environment
1)Check the ambient temperature,
humidity, vibration and atmosphere
(dust, gas, oil mist, water drops).
2)Check if tools or other foreign matter
or dangerous objects are left around
the equipment.
1) Check visually
or measure
using
apparatus.
2) Visual
inspection
1) The standard
specification
must be
satisfied.
2) No foreign or
dangerous
objects are left.
Voltage Check if the voltages of the main circuit
and control circuit are correct.
Measure using a
multimeter or the
like.
The standard
specification must
be satisfied.
Keypad panel 1) Check if the display is clear.
2) Check if there is missing parts in the
characters.
1), 2) Visual
inspection
1, 2) The display
can be read
and there is
no fault.
Structure such as
frame and cover
1) Abnormal noise and excessive
vibration
2) Loose bolts (tightened parts)
3) Deformation and breakage
4) Discoloration and deformation
caused by overheat
5) Stains and dust
1) Visual or
hearing
inspection
2) Retighten.
3), 4), 5) Visual
inspection
1),2),3),4),5)
No abnormalities
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