Wiring main and control circuit – Yaskawa V74X Drives User Manual
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Wiring
Main and Control Circuit
Section 4
Main Circuit Input /Output Wiring
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Use 600V vinyl-sheathed wire or equivalent. Wire size and type should be determined by local electrical codes.
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Avoid routing power wiring near equipment sensitive to electrical noise.
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Avoid running input and output wiring in the same conduit.
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NEVER connect AC main power to output terminals T1(U), T2(V), and T3(W).
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NEVER allow wire leads to contact metal surfaces. Short-circuit may result.
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NEVER connect power factor correction capacitors to the Drive output. Consult Yaskawa when connecting noise
filters to the Drive output.
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WIRE SIZING MUST BE SUITABLE FOR CLASS I CIRCUITS.
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When connecting motor to Drive’s output terminals, include a separate ground wire. Attach ground wire solidly to
motor frame and to Drive’s ground terminal .
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When using armored or shielded cable for connection between Drive and motor, solidly connect armor or shield
to motor frame, and to Drive’s ground terminal .
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Motor lead length should NOT EXCEED 164 feet (50 meters), and motor wiring should be run in a separate con-
duit from the power wiring. If lead length must exceed this distance, reduce carrier frequency (see TM.V7.01,
paragraph 5.8) and consult factory for proper installation procedures.
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Use UL listed closed loop connectors or CSA certified ring connectors sized for the selected wire gauge. Install
connectors using the correct crimp tool recommended by the connector manufacturer.
Control Circuit
All basic control circuit (signal) interconnections are shown in the appropriate diagram:
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Interconnections for external two-wire control in combination with the Digital Operator are shown in Figure 1-5.
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Interconnections for external three-wire control in combination with the Digital Operator are shown in Figure 1-6.
Make wire connections according to Figures 1-5 and 1-6 and Table 1-2; observe the following:
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Signal Leads: Terminals S1-S7 & SC; RP, FS, FR & FC; R+, R-, S+, S-; & AM & AC.
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Control Leads: Terminals P1, P2 & PC; MA, MB & MC.
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Use twisted shielded or twisted-pair shielded wire (20-16 AWG [0.5 – 1.25mm2]) for control and signal circuit
leads. The shield sheath MUST be connected at the drive end ONLY (terminal ). The other end should be
dressed neatly and left unconnected (floating). See Figure 1-1.
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