Mitsubishi FR-S500 Instruction Manual download pdf (Page 165)

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(2) Smoothing capacitors

A large-capacity aluminum electrolytic capacitor is used for smoothing the DC in the

main circuit, and an aluminum electrolytic capacitor is also used for stabilizing the

control power in the control circuit.

Their characteristics are adversely affected by ripple current, etc. When the inverter is

operated in an ordinary, air-conditioned environment, change the capacitors about

every 5 years. When 5 years have elapsed, the capacitors will deteriorate more

rapidly. Check the capacitors at least every year (less than six months if the life will be

expired soon). Check the following:

1) Case (side faces and bottom face for expansion)

2) Sealing plate (for remarkable warp and extreme crack)

3) Appearance, external cracks, discoloration, leakage.

When the measured capacitance of the capacitor has reduced below 85% of the

rating, change the capacitor.

(3) Relays

To prevent a contact fault, etc., relays must be changed according to the number of

accumulative switching times (switching life).

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Mitsubishi FR-S500 Instruction Manual Page 165