When Using Separate Power Supplies For The Control Circuit And The Main Circuit - Mitsubishi Electric FR-A802-E Instruction Manual

• Separate the wiring of the control circuit away from the wiring of the main circuit.
Make cuts in rubber bush of the inverter side and lead the wires through.
Rubber bush
(viewed from inside)
Make cuts along the lines on
the inside with a cutter knife
2.6.6 When using separate power supplies for the
control circuit and the main circuit
 Cable size for the control circuit power supply (terminals R1/L11 and S1/
L21)
• Terminal screw size: M4
• Cable gauge: 0.75 to 2 mm
• Tightening torque: 1.5 N·m
 Connection method
If a fault occurs and the electromagnetic contactor (MC) installed at the inverter's input line is opened, power supply to the
control circuit is also stopped and the fault signals cannot be output anymore. Terminals R1/L11 and S1/L21 of the control
circuit are provided to keep outputting the fault signals in such a case. Follow the following steps to wire terminals R1/L11 and
S1/L21 on the inverter to the power input lines of the MC.
A jumper is installed across terminal R1/L11 and terminal P/+, and across terminal S1/L21 and terminal N/-. Do not connect
the power cable to incorrect terminals. Doing so may damage the inverter.
Connection diagram
MC
54
2. INSTALLATION AND WIRING
2.6 Control circuit
2
Converter unit Inverter
R/L1 P/+ P/+
S/L2 N/- N/-
T/L3
R1/L11
S1/L21
Remove the jumper
<Wiring example>