When Using Separate Power Supplies For The Control Circuit - Mitsubishi Electric FR-A820-00046 Instruction Manual

Installation and wiring
2.6.5 When using separate power supplies for the control circuit and the main circuit
Cable size for the control circuit power supply (terminals R1/L11, S1/L21)
● Terminal screw size: M4
● Cable gauge: 0.75 mm² to 2 mm²
● Tightening torque: 1.5 Nm
Connection method
When a fault occurs, opening of the electromagnetic contactor (MC) on the inverter power supply
side results in power loss in the control circuit, disabling the fault output signal retention. Terminals
R1/L11 and S1/L21 are provided to hold a fault signal. In this case, connect the power supply terminals
R1/L11 and S1/L21 of the control circuit to the input side of the MC.
Do not connect the power cable to incorrect terminals. Doing so may damage the inverter.
FR-A820-00250(3.7K) or lower, FR-A840-00126(3.7K) or lower
Remove the upper screws.
Remove the lower screws.
Remove the jumper.
Connect the separate power supply cable for the control circuit to the lower terminals (R1/L11,
S1/L21).
Fig. 2-40:
FR-A800
MC
R/L1
S/L2
T/L3
R1/L11
S1/L21
Remove the jumper
R/L1
R1/L11
S1/L21
Main circuit terminal block
Detailed view of the terminals
Fig. 2-39:
Power supply for control and main circuit
Inverter
S/L2
T/L3
Control circuit
I002376E
I002846E
2 - 57