Mitsubishi Electric FR-A700 Instruction Manual page 765

Maintenance and inspection
Replacement procedure of the cooling fan when using a heatsink protrusion attachment
(FR-A7CN)
When replacing a cooling fan, remove a top cover of the heatsink protrusion attachment and per-
form replacement. After replacing the cooling fan, replace the top cover in the original position.
Smoothing capacitors
A large-capacity aluminum electrolytic capacitor is used for smoothing in the main circuit DC
section, and an aluminum 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 ca-
pacitors about every 10 years.
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. Judge that the capacitor has
reached its life when the measured capacitance of the capacitor reduced below 80% of the
rating.
Relays
To prevent a contact fault, etc., relays must be replaced according to the cumulative number of
switching times (switching life).
FR-A700 EC
Top cover
Fig. 8-11:
Replacement procedure of the cooling fan
when using a heatsink protrusion attachment
Inspection
I001356E
8 - 13