Mitsubishi Electric 800 Series Instruction Manual page 665

Inspection item
Smoothing capacitors
A large-capacity aluminum electrolytic capacitor is used for smoothing in the DC section of the main circuit, and an aluminum
electrolytic capacitor is used for stabilizing the control power in the control circuit. Adverse effects from ripple currents
deteriorate capacitors. Replacement intervals of capacitors vary greatly with surrounding temperatures and operating
conditions. Replace them roughly every 10 years when used in normal air-conditioned environments.
Inspecting the product visually:
• Case: Check that the sides and bottom of the capacitor have not ruptured.
• Rubber seal: Check for any noticeable bulging or severe cracks.
• Check for external cracks, discoloration, leakage, etc. It is assumed that the capacitor has reached the end of its life when
its capacity has dropped below 80% of its rated capacity.
NOTE
• The inverter diagnoses the main circuit capacitor and control circuit capacitor by itself and estimates its remaining life. (Refer
to page 262.)
Relay output terminals
• The contacts of relays deteriorate over time. To prevent faults from occurring, relays must be replaced when they have
reached the maximum of switching operations (switching life).
• The control terminal block must be replaced (refer to
terminals C1 and B1 or A1, or terminals C2 and B2 or A2. 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 inside the inverter (FR-A860-02890 or higher)
A fuse is used inside the inverter. Replacement intervals of fuses vary with surrounding temperatures and operating
conditions. Replace them roughly every 10 years when used in normal air-conditioned environments.
664
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
page 665) in case of failure of either relay between the relay output
page 47.)