Mitsubishi Electric FR-E700 Instruction Manual page 571

Maintenance and inspection
Smoothing capacitors
A large-capacity aluminium electrolytic capacitor is used for smoothing in the main circuit DC section,
and an aluminium electrolytic capacitor is used for stabilizing the control power in the control circuit.
Their characteristics are deteriorated by the adverse effects of ripple currents, etc.
The replacement intervals greatly vary with the ambient temperature and operating conditions.
When the inverter is operated in air-conditioned, normal environment conditions, replace the capac-
itors about every 10 years
Judge that the capacitor has reached its life when the measured capacitance of the capacitor reduced
below 80% of the rating.
When a certain period of time has elapsed, the capacitors will deteriorate more rapidly. Check the ca-
pacitors at least every year (less than six months if the life will be expired soon).
The appearance criteria for inspection are as follows:
● Case: Check the side and bottom faces for expansion
● Sealing plate: Check for remarkable warp and extreme crack.
● Check for external crack, discoloration, fluid leakage, etc.
Relays
To prevent a contact fault, etc., relays must be replaced according to the cumulative number of
switching times (switching life).
FR-E700 SC EC/ENE
Inspection
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