Emerson Process Management El-O-Matic E and P Series E25-E950 - Handbuch (Seite 53)

26 DOC,F20,EDN Rev.: -
7.1 Introduction
The Position transmitter option provides a continuous position
indication by transmitting a 4 to 20 mA signal. This is propor-
tional to the actuators shaft position. The option is equipped
with trimmers for zero and span adjustment. These parameter
are not interrelated and adjusting one of these parameters will
not affect the other. Feedback is reversable from a 4-20 mA
signal to a 20-4 mA signal by means of two jumpers.
The option consists of an electronic card with a potentiometer.
The electronic card is mounted on top of the positioners main
board and fastened by three bolts. The wiring of the potentio-
meter is prewired.
Pos Qty Description
1 1 Position transmitter card
2 3 Screw
3 3 Spacer
1. Remove cover and dial .
2. Turn positioner shaft CCW and potentiometer shaft CW until
they block (see fig. 7.0).
3. Place positioner transmitter option on the positioners main
board and fix the three screws (see fig. 7.1). Check posi-
tioner shaft for 90° rotation.
7.2 Installation
Before starting check the “Q-PT” kit to ensure that all the parts
are available.
Specifications;
Potmeter resistance
: 50 KOhm
Umax : 30 VDC
Umin : 15 VDC
Signal out : 4 - 20 mA
7.0 Position transmitter option PTF20 / Stellungsgeberoption PTF20 / Positietransmitter
optie PTF20
7.0
7.1