Delta Electronics VFD-S manual Analog input terminals AVI, GND, Digital inputs M0~M5, GND, General

Chapter 2 Installation and WiringVFD-S Series

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 μ F and above) and ferrite core as indicated in the following diagrams:

AVI

C

GND

ferrite core

wind each wires 3 times or more around the core

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 2-27