Chapter 2 Installation and Wiring_VFD-B Series
Revision 10/2005, BE13, SW V4.08 2-25
Analog input terminals (AVI, ACI, AUI, ACM)
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Analog input signals are easily affected by external noise. Use shielded wiring and keep it as short
as possible (<20m) with proper grounding. If the noise is inductive, connecting the shield to terminal
ACM can bring improvement.
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If the analog input signals are affected by noise from the AC motor drive, please connect a capacitor
and ferrite core as indicated in the following diagrams:
C
AVI/ACI/AUI
ACM
ferrite core
wind each wires 3 times or more around the core
Digital inputs (FWD, REV, JOG, EF, TRG, MI1~MI6, DCM)
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When using contacts or switches to control the digital inputs, please use high quality components to
avoid contact bounce.
Digital outputs (MO1, MO2, MO3, MCM)
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Make sure to connect the digital outputs to the right polarity, see wiring diagrams.
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When connecting a relay to the digital outputs, connect a surge absorber or fly-back diode across
the coil and check the polarity.
General
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Keep control wiring as far as possible from the power wiring and in separate conduits to avoid
interference. If necessary let them cross only at 90º angle.
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The AC motor drive control wiring should be properly installed and not touch any live power wiring or
terminals.
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