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Installation, Operation and Maintenance Manual ManRE20en Rev.06/2022
OMC S.p.A: Via G. Galilei, 18 - 20060 - Cassina de Pecchi (MI) - ITALY - www.omcvalves.com - Tel.: (+39) 02.95.28.468
5. Connection – Power
5.1 Safety
Before connecting terminal, ensure that the power is off completely.
Please use ring terminal to protect against vibration or any other external impact.
Positioner usually uses 4~20mA DC. Minimum ampere of input signal of positioner is 3.2 mA but
maximum ampere of input signal should be 24mA or under.
Positioner with PTM options must be supplied with
9~28V DC
separately.
DO NOT connect Voltage source (9~28V DC) to Input (4~20mA DC) terminal (IN+, IN-) as it will
cause PCB failure.
Positioner should be grounded.
Please use twisted cable with conductor section are 1.25mm
2
and that is suitable for 600V
(complying with the conductor table of NEC Article 310.) The outer diameter of the cable
should be between 6.35 ~ 10mm. Use shield wire to protect against electro-magnetic field and
noise.
Please do not install the cable near high noise equipment, such as high-capacity transformer or
motor.
Please ensure that keep away magnetic materials from a product. It may cause malfunction. For
a magnetic screwdriver, It must be away more than 30cm from a product cover.
5.2 Connection
Fig. 5-1: Terminal Overview
5.3 Ground
1. Ground must be done before operating the positioner.
2. Open base cover and there is an internal ground “F.G” on the left hand.
An external ground bolt is located next to the conduit entry. Please make sure that the
resistance is less than 100 ohm.
IN +:
Input Signal (+)
IN -:
Input Signal (-)
F.G :
Frame Ground
OUT+: Feedback Signal (+)
OUT-: Feedback Signal (-)
AO: Analog
Output
AI: Analog
Input
Vs: Voltage
Source