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Control Circuit Wiring Precautions
Observe the following precautions when wiring control circuits.
•
Separate control circuit wiring from main circuit wiring (terminals R/L1, S/L2, T/L3, U/T1, V/T2, W/T3,
,
1,
2 and
3) and other high-power lines.
•
Separate wiring for control circuit terminals MA, MB, MC, M1, M2, M3 and M4 (contact outputs) from
wiring to other control circuit terminals.
•
If using an optional external power supply, it shall be a UL Listed Class 2 power supply source.
•
Use twisted-pair or shielded twisted-pair cables for control circuits to prevent operating faults. Process
cable ends as shown in Fig 2.20.
•
Connect the shield wire to terminal E (G).
•
Insulate the shield with tape to prevent contact with other signal lines and equipment.
Fig 2.20 Processing the Ends of Twisted-pair Cables
Shield sheath
Armor
Connect to shield sheath ter-
minal at Inverter (terminal E
(G))
Insulate with tape
Do not connect here.