• To prevent a contact fault, etc., relays must be replaced according to the cumulative number of switching times (switching
• The control terminal block must be replaced in case of failure of either relay between the relay output 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-A840-04320(160K) or higher)
Fuses are used in some inverters. The surrounding air temperature and operating condition affect the life of fuses. When the
inverter is used in a normal air-conditioned environment, replace its fuse after about 10 years.
The inverter can be replaced with the control circuit wiring kept connected. Before replacement, remove the wiring cover of the
Loosen the two installation screws at the both side of the control circuit terminal block. (These screws cannot be
Slide down the control circuit terminal block to remove it.
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.
• Before starting inverter replacement, switch OFF the power, wait for at least 10 minutes, and then check the voltage with a
tester and such to ensure safety.
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Fix it with
7.1 Inspection item