During operation, check inverter input/output voltage with a multimeter.
(2) Periodic inspection
Check the followings periodically with the inverter stopped:
(a) Check that the cooling system is in good condition.
Clean air filters, etc.
(b) Screws, bolts, nuts and other fasteners may become loose with time,
due to vibration, thermal expansion/retraction, etc.
Retighten loose screws or other fasteners.
(c) Check if conductors and insulators are not corroded. or damaged.
(d) Measure insukation resistances.
(e) Check the cooling fan, smoothing capacitor, contactors and relays for
condition.
Table 2 shows the standard daily and periodic inspection schedule.
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(3) Insulation resistance test with megger
(a) Before checking insulation resistances of the external circuits with a
megger, disconnect wires (cables) from all inverter terminals so that
test voltage is not applied to the inverter circuits.
(b) Conduct the insulation resistance test on the inverter main circuit
only, as shown in Fig. 7.
Do not conduct the test on the control circuit of inverter.
(c) To check the control circuits for continuity, use a multimeter (high
resistance range> .
,
Do not use a megger or buzzer to check.
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