2.6.4 Wiring precautions It is recommended to use a cable of 0.3 to 0.75 mm 2 for the connection to the control circuit terminals. The wiring length should be 30 m (200 m for terminal FM) at the maximum. Use two or more parallel micro-signal contacts or twin contacts to prevent contact faults when using contact inputs since the control circuit input signals are micro-currents. Micro signal contacts Twin contacts To suppress EMI, use shielded or twisted cables for the control circuit terminals and run them away from the main and power circuits (including the 200 V relay sequence circuit).
For the cables connected to the control circuit terminals, connect their shields to the common terminal of the connected control circuit terminal. When connecting an external power supply to terminal PC, however, connect the shield of the power supply cable to the negative side of the external power supply. Do not directly earth (ground) the shield to the enclosure, etc. When a relay coil is connected to the output terminals, use one with a surge absorbing function (reflux diode). When the Always apply a voltage to the fault output terminals (A1, B1, C1, A2, B2, and C2) via a relay coil, lamp, etc. voltage application direction is incorrect, the inverter will be damaged.
Pay attention to the diode direction or other precautions to avoid incorrect wiring. Power 24 or 12 VDC For the FR-A820-03160(55K) or higher and FR-A840-02160(75K) or higher, separate the wiring of the control circuit away Inverter from the wiring of the main circuit. Make cuts in rubber bush of the inverter side and lead the wires through the cuts. Rubber bush (viewed from inside) Make cuts along the lines on the inside with a cutter knife 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 and S1/ L21) Terminal screw size: M4 78 2. INSTALLATION AND WIRING 2.6 Control circuit RUN SE RA