Electrical Connections - Initial Setup; Electrical Connections; Initial Setup - Zero, Range And Sensitivity; Zero Setting - EL-O-MATIC F20 Manual De Instalación Y Operación

4.0 Electrical Connections - Initial Setup / Raccordements électriques - Réglage initial /
Conexiones eléctricas / Configuración inicial
Positioner coil
Feeback potentiometer
-
+
4.0
Damp
= Sensibilité
Zero = Zéro
Span
= Portée
Input signal = Signal d'entrée
Positioner coil
= Bobine du positionneur
Feedback = Potentiomètre de réac-
potentiometer tion
Span
Zero
Damp
4-20 mA
(~8 VDC Input signal)
= Sensibilidad
= Valor cero
= Rango
= Señal de entrada
= Bobina del posicionador
= Potenciómetro de retroali-
mentación
16
4.1

Electrical Connections

Connect the 4 - 20 mA signal to the terminals (4) and (5),
making sure that the + and - are the correct way round. The
voltage is ~8 VDC.
4.2 Initial Setup - Zero, Range and Sensi-
tivity
The factory settings provide the positioner with an initial range
of settings that will allow the operation of positioners on most
applications.
Signal Input - 4 mA. - 20 mA.
Range - 0% to 100%
Control Function - Linear.
Action - Direct Acting.
(CCW with increasing Signal).
Three settings are provided on the main circuit board. These
allow adjustments of the zero, range and dead band (sensitiv-
ity).
Before making adjustments the positioner should be already
mounted on the valve/actuator, air supply connected, and a 4 -
20 mA.(¯8V.) signal connected to the signal input terminals.
4.3

Zero Setting

The zero resetting trimmer on the circuit board is marked
"Zero". To change the position for the 4 mA signal, first set the
signal to 4 mA, then turn the trimmer screw until the desired
position is reached.
4.4

Range Setting

The positioner range is limited by the stroke position at the 20
mA. signal point. The range resetting trimmer on the circuit
board is marked "Span". To change range, first set the signal to
20 mA, then turn the trimmer screw until the desired position is
reached.
4.5

Sensitivity Setting

A setting that is too high will cause the positioner to "hunt" with
difficulty in establishing a settled output. A setting that is too
low causes an output that is sluggish and lacking in response.
The sensitivity resetting trimmer on the circuit board is marked
"Damp". To change sensitivity, first set the signal to an approxi-
mate mid point between 4 and 20 mA, then turn the trimmer
screw until the best result is reached.
Note:
The trimmers operate clockwise (CW) to increase, counter
clockwise (CCW) to decrease.
DOC,F20,EFS Rev.: -