Chapter 2 Installation and Wiring|VFD-B-P Series
Revision April 2009, SW V1.00 2-31
Analog input terminals (AVI, ACI, AUI, ACM)
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.
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
VI/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)
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)
Make sure to connect the digital outputs to the right polarity, see wiring diagrams.
When connecting a relay to the digital outputs, connect a surge absorber or fly-back diode
across the coil and check the polarity.
General
Keep control wiring as far away as possible from the power wiring and in separate conduits
to avoid interference. If necessary let them cross only at 90º angle.
The AC motor drive control wiring should be properly installed and not touch any live power
wiring or terminals.
NOTE
If a filter is required for reducing EMI (Electro Magnetic Interference), install it as close as
possible to AC drive. EMI can also be reduced by lowering the Carrier Frequency.
When using a GFCI (Ground Fault Circuit Interrupter), select a current sensor with sensitivity
of 200mA, and not less than 0.1-second detection time to avoid nuisance tripping. For the
specific GFCI of the AC motor drive, please select a current sensor with sensitivity of 30mA
or above.
DANGER!
Damaged insulation of wiring may cause personal injury or damage to circuits/equipment if it
comes in contact with high voltage.
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