Delta Electronics VFD-M manual Mcm, Analog inputs AVI, ACI, Digital outputs MO1

		Chapter 2 Installation and Wiring
Terminal	Terminal Function	Factory Settings (NPN mode)
Symbol
		Maximum: 48Vdc, 50mA
		Refer to P45 for programming.
		MO1-DCM	Max: 48Vdc/50mA
MO1	Multi-function Output Terminal		MO1
	(Photocoupler)
		Internal Circuit	MCM
MCM	Multi-function Output Common	Common for Multi-function Outputs
	(Photocoupler)

Note: Use twisted-shielded, twisted-pair or shielded-lead wires for the control signal wiring. It is recommended to run all signal wiring in a separate steel conduit. The shield wire should only be connected at the drive. Do not connect shield wire on both ends.

Analog inputs (AVI, ACI)

„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/ACI

C

GND

ferrite core

wind each wires 3 times or more around the core Digital inputs (M0~M5)

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

Digital outputs (MO1)

„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.

Revision May 2008, ME14, SW V3.04 2-11