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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 control circuit capacitor by itself and can estimate its remaining life. (Refer to the FR-A860
Instruction Manual (Detailed).)
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 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. Replacement intervals of fuses vary with surrounding temperatures and operating
conditions. Replace them roughly every 10 years when used in normal air-conditioned environments.
page
78) in case of failure of either relay connected to the relay output
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inspection item
page
36.))
5
77
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