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7.4.
Inspecting and Replacing Main Circuit Capacitor
If any abnormalities of the main circuit capacitor (such as electrolyte leakage or change of color) are found
in a periodic inspection, etc., you should contact us.
The converter indicates an expected life of the main circuit capacitor with the timer remaining time 1: tin1
of the monitor item.
When a value of the timer remaining time 1: tin1 becomes less than or equal to "0," replacement of the main
circuit capacitor is recommended.
When the main circuit capacitor operates for 12 hours per day at the average ambient temperature of below 35
℃
,
it should be replaced in ten years as a guide.
Caution
Main circuit capacitor
●
Before using the converter which has been stored for three or more years as a spare, conduct aging of the
main circuit capacitor. For aging, apply the rated input voltage to the converter for about eight hours with
its output electrical wire removed.
If the capacitor is used without aging, it may be damaged, resulting in a dangerous situation.
7.5.
How to Perform Insulation Resistance Test
When the board and the terminal block have been cleaned in a periodic inspection, etc., before operating the
converter, you should perform the insulation resistance test of the main circuit and check it for short-circuit.
Use a megger with 500 VDC to perform the insulation resistance test.
Do not perform the insulation resistance test of the control circuit.
Prepared items
･
Phillips screwdriver (M3)
･
Phillips screwdriver (M4)
･
Megger with 500 VDC
1. Turn off the converter, and open the front cover.
･
For how to open the front cover, refer to {3.2. How to Open and Close Front Cover}.
･
Use the Phillips screwdriver (M4).
Short circuit between terminals
Main circuit terminal block
Megger
