Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual page 100

(1) Cooling fan
The cooling fan is used to cool heat-generating parts such as the main circuit semiconductors. The life of the
cooling fan bearing is usually 10,000 to 35,000 hours. Hence, the cooling fan must be replaced every 2 to 3 years if
the inverter is run continuously. When unusual noise and/or vibration is noticed during inspection, the cooling fan
must be replaced immediately.
!
Removal
1) Remove the front cover and wiring cover. (Refer to page 4.)
2) Push the catches from above and remove the fan cover.
3) Disconnect the fan connectors.
4) Remove the fan.
!
Reinstallation
1) After confirming the orientation of the fan, reinstall the fan so that the
arrow on the left of "AIR FLOW" faces up.
AIR FLOW
CAUTION
Installing the fan in the opposite air flow direc-
tion can cause the inverter life to be shorter.
2) Reconnect the fan connectors.
When wiring, use care to avoid the cables being caught by the fan.
3) Reinstall the fan cover.
(2) 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 capacitors about every 10 years.
The appearance criteria for inspection are as follows:
1) Case: Check the side and bottom faces for expansion
2) Sealing plate: Check for remarkable warp and extreme crack.
3) 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.
(3) Relays
To prevent a contact fault, etc., relays must be replaced according to the cumulative number of switching times
(switching life).
<Fan side face>
96
Precautions for maintenance and
<Example: FR-V520-5.5K>
inspection
Fan cover
Fan
Fan connectors
6