Analog Input Terminals (AI1, AI2, AI3 and ACM)
Analog input signals are easily affected by external noise. Use shielded wiring and
keep it as short as possible (< 20 m) with proper grounding. If the noise is inductive,
connecting the shield to the ACM terminal can reduce interference.
Use twisted-pair wire for weak analog signals.
If the analog input signals are affected by noise from the AC motor drive, connect a
capacitor and a ferrite core as shown in the figure below.
Figure 3-2
Digital Inputs (FWD, REV, MI1–MI6 and COM)
The “COM” terminal is a common terminal of the photo-coupler in all the wiring
methods.
When the photo-coupler uses the internal power supply, the switch connection for
Sink and Source modes are as below:
MI-DCM: Sink mode
MI-+24V: Source mode
When the photo-coupler uses the external power supply, remove the short-circuit
cable between +24V and COM terminals. Connect the +/- terminal of the external
power supply to the MI ro COM terminal to determine the Sink or Source mode.
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