Delta Electronics VFD-G manual Analog inputs AI1, AI2, AC1, AC2, Relay outputs RA1, RB1, RC1

Chapter 2 Installation and Wiring

Terminal	Terminal Function	Factory Settings
Symbol
+12V/ACM	Potentiometer power source	+12Vdc 20mA (Variable Resistor: 3~5KΩ)
		0~10V/0~1A correspond to 0~Max. operation frequency
AI1	Analog voltage/current Input	Resolution: 10 bits
		Function: Pr.04-05 ~ Pr.04-25
		0~10V/0~1A correspond to 0~Max. operation frequency
AI2	Analog voltage/current Input	Resolution: 10 bits
		Funciton: Pr.04-05 ~ Pr.04-25
AC1/AC2	Analog control signal common	Used as common for analog inputs.

NOTE: Control signal wiring size: 18 AWG (0.75 mm2) with shielded wire.

Analog inputs (AI1, AI2, AC1, AC2)

„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 AC1/AC2 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:

AI1/AI2

C

AC1/AC2

ferrite core

wind each wires 3 times or more around the core

Digital inputs (MI1~MI4, DCM, FWD, REV, EF)

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

Relay outputs (RA1, RB1, RC1)

„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.

2-12 Revision July 2008, EG03, SW V1.06