E6581158
N-3
14
(Note) Before an insulation test, always disconnect all cables from the main circuit terminal board
and test the inverter separately from other equipment..
500V
(megger)
R/L 1 S/L 2 T/L 3 U/T 1 V/T 2 W/T 3
7. Never test the inverter for pressure. A pressure test may cause damage to its components.
8. Voltage and temperature check
Recommended voltmeter
Input side ... Moving-iron type voltmeter (
)
Output side ... Rectifier type voltmeter (
)
It will be very helpful for detecting a defect if you always measure and record the ambient temperature
before, during and after the operation.
Q Replacement of expendable parts
The inverter is composed of a large number of electronic parts including semiconductor devices. The
following parts deteriorate with the passage of time because of their composition or physical properties. The
use of aged or deteriorated parts leads to degradation in the performance or a breakdown of the inverter. To
avoid such trouble, the inverter should be checked periodically.
Note) Generally, the life of a part depends on the ambient temperature and the conditions of use. The life
spans listed below are applicable to parts when used under normal environmental conditions.
1) Cooling fan
The fan, which cools down heat-generating parts, has a service life of about 30,000 hours (about 2 or 3
years of continuous operation). The fan also needs to be replaced if it makes a noise or vibrates
abnormally.
2) Smoothing capacitor
The smoothing aluminum electrolytic capacitor in the main circuit DC section degrades in performance
because of ripple currents, etc. It becomes necessary to replace the capacitor after it is used for about
10 years under normal conditions. Since the smoothing capacitor is mounted on a printed circuit board,
it needs to be replaced together with the circuit board.
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