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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, B1, B2, 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, and M2 (contact outputs) from wiring to
other control circuit terminals.
•
Use shielded twisted-pair cables for control circuits to prevent operating faults. Process cable ends as
shown in
Fig 2.23
.
•
Connect the shield wire to terminal E (G).
•
Insulate the shield with tape to prevent contact with other signal lines and equipment.
•
Use a class 2 power supply (UL standard) when connecting to the control terminals.
Fig 2.23 Processing the Ends of Shielded Twisted-pair Cables
Shield sheath
Armor
Connect to shield sheath ter-
minal at Inverter (terminal E
(G))
Insulate with tape
Do not connect here.