Delta CT2000 Series, User Manual, Page: 48 / 634

Chapter 6 Control Terminals

CT2000 Series
6-1
Chapter 6 Control Terminals
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 inputting analog signal in a circuit, use twisted pairs to handle weak signals.
 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.
C
AVI/ACI/AUI
ACM
ferrite core
Wind each wires 3 times or more around the core
Digital inputs (FWD, REV, MI1~MI8, COM)
 When using contacts or switches to control the digital inputs, please use high
quality components to avoid contact bounce.
Transistor outputs (MO1, MO2, MCM)
 Make sure to connect the digital outputs to the right polarity.
 When connecting a relay to the digital outputs connect a surge absorber across
the coil and check the polarity.