Delta C2000 Series User Manual page 99

Chapter 6 Control TerminalsC2000
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.
When using analog input signal in the circuit, twisted pair is suggested to use for

dealing with weak signal.
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 diagram.
Digital inputs (FWD, REV, MI1–MI8, COM)
The "COM" terminal is the common side of the photo-coupler. Any of wiring method,

the "common point" of all photo-coupler must be the "COM".
Wind each wires 3 times or more around the core
C
ferrite core
Figure 6-2
Figure 6-4
6-2
AVI/ACI/AUI
ACM
Figure 6-1
Figure 6-3
Figure 6-5