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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.
•
If
using an optional external power supply, it must 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 2.26.
•
Connect
the shield wire to terminal E (G).
•
Insulate
the shield with tape to prevent contact with other signal lines and equipment.
Fig 2.26 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.
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