Delta Electronics VFD-EL manual Danger, Analog inputs AVI, ACM, General, Avi C Acm

Chapter 2 Installation and Wiring

Analog inputs (AVI, 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 (0.1 μ F and above) and ferrite core as indicated in the following diagrams:

AVI

C

ACM

ferrite core

wind each wires 3 times or more around the core Digital inputs (MI1~MI6, DCM)

„When using contacts or switches to control the digital inputs, please use high quality components to avoid contact bounce.

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.

DANGER!

Damaged insulation of wiring may cause personal injury or damage to circuits/equipment if it comes in contact with high voltage.

2-14 Revision August 2008, 2ELE, V1.02