Delta Electronics VFD S 115V Series User Manual page 42

Analog input terminals (AVI, GND)
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 GND can bring improvement.
If the analog input signals are affected by noise from the AC motor drive, please connect
a capacitor (0.1
Digital inputs (M0~M5, GND)
When using contacts or switches to control the digital inputs, please use high quality
components to avoid contact bounce.
Digital outputs (MO1, 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 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 general GFCI (Ground Fault Circuit Interrupter), select a current sensor
with sensitivity of 200mA or above, 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.
Revision August 2008, SE09, SW V2.61
μ
F and above) and ferrite core as indicated in the following diagrams:
wind each wires 3 times or more around the core
Chapter 2 Installation and Wiring|VFD-S Series
AVI
C
GND
ferrite core
2-27