Inverter Replacement - Mitsubishi Electric F800-E Series Instruction Manual

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 surrounding air 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:
• Case: Check the side and bottom faces for expansion.
• Sealing plate: Check for remarkable warp and extreme crack.
• heck for external crack, discoloration, liquid leakage, etc. Judge that the capacitor has reached its life when the measured
capacitance of the capacitor reduced below 80% of the rating.
NOTE
• The inverter diagnoses the control circuit capacitor by itself and can judge its life. (Refer to the FR-F860 Instruction Manual
(Detailed))
Relays
• To prevent a contact fault, etc., relays must be replaced according to the cumulative number of switching times (switching
life).
• The control terminal block must be replaced in case of failure of either relay connected to the relay output terminals A1, B1,
and C1, or A2, B2, and C2. (After replacing the control terminal block, connect the jumper connector to the correct position
in accordance with the control logic of input signals. (Refer to
Main circuit fuse
A fuse is used inside the inverter. The replacement intervals vary with the surrounding air temperature and operating
conditions. When the converter unit is operated in air-conditioned, normal environment conditions, replace the capacitors
about every 10 years.
5.1.7

Inverter replacement

The inverter can be replaced with the control circuit wiring kept connected.
1) Loosen the two mounting screws at the both side of the control circuit terminal block. (These screws cannot be removed.)
Slide down the control circuit terminal block to remove it.
Loosen the screws
2) Be careful not to bend the pins of the inverter's control circuit connector, reinstall the control circuit terminal block and fix it
with the mounting screws.
NOTE
• Before starting inverter replacement, switch power OFF, wait for at least 10 minutes, and then check the voltage with a tester
and such to ensure safety.
page 35.))
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inspection item
5
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