GE BAKER HUGHES Masoneilan SVi 1000, Quick Start Manual

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Optional Retransmit Output
Introduction
The SVi1000 supports a 4-20mA Position Retransmit Feedback option. The retransmit output re-
quires a DC power source (10V~30V) to properly function. The signal could be input into a DCS/
PLC analog input module to read out the current valve position.
The output terminals are polarity sensitive and must be connected only to a DC circuit. The Re-
transmit (+) terminal must be electrically positive with respect to the (–) terminal.
In normal working conditions, the retransmit output follows the valve position by outputting a 4-
20mA analog signal. If the positioner stops working due to lose of loop power or malfunctioning,
the retransmit output stays at around 3.2 mA.
This section discusses the necessary precautions when configuring a system.
An incorrect polarity connection will result in device
not properly functioning or with internal circuitry
damage.
Consult with qualified personnel to ensure that
electrical requirements for the switch are met.
The external series resistor is normally located in a DCS/PLC analog input module, so that the
valve position (current) can be transferred into voltage (Figure 35).
Figure 35 Simplified Retransmit Option Installation Drawing
CAUTION
CAUTION
SVi1000 Switch
Retransmit
External
Voltage
Source:
10 V to 30 V
4 - 20 mA current flow