Yaskawa F7 Drive User Manual - Manual (Page 51)

Electrical Installation 2 - 24
Control Circuit Wiring Precautions
Observe the following precautions when wiring control circuits:
1. Separate control wiring from power/motor wiring (terminals R/L1, S/L2, T/L3, U/T1, V/T2, W/T3, B1, B2, , 1, 2,
and 3) and other high-power lines.
2. Separate wiring for control circuit terminals MA, MB, MC, M1, M2, M3, M4, M5, and M6 (digital outputs) from wiring to
other control circuit terminals.
3. If using an optional external power supply, ensure it is a UL Listed Class 2 power supply source.
4. Use twisted-pair or shielded twisted-pair cables for control circuits to prevent operating faults. Prepare cable ends as shown
in Fig 2.12.
5. Connect the shield wire to terminal E(G).
6. Insulate the shield with tape to prevent contact with other signal lines and equipment.
Fig 2.12 Preparing the Ends of Twisted-pair Cables
Control Circuit Wire Sizes
For remote operation, keep the length of the control wiring to 50m or less. Separate the control wiring from high-power lines
(input power, motor leads or relay sequence circuits) to reduce noise induction from peripheral devices.
When setting speed commands from an external speed potentiometer, use shielded twisted-pair wires and ground the shield to
terminal E(G), as shown above. Terminal numbers and wire sizes are shown in Table 2.12.
Wiring Checks
After all wiring is completed, perform the following checks:
1. Is all wiring correct?
2. Have all wire clippings, screws or other foreign material been removed from the Drive enclosure?
3. Are all terminal screws tight?
Shield sheath Insulation
Connect to shield sheath
terminal E(G) at Drive
Insulate with tape
Do not connect here.