IM-P402-93 AB Issue 7
14
6.6 Wiring - modulating control with 4 - 20 mA positioner
(All relays shown in the power off position)
Note: It is essential to select the correct sensitivity on the PA20 preamplifier,
(see Installation and Maintenance Instructions for details). 4 mA always represents
valve closed, and 20 mA represents valve open, regardless of whether 'pump in' or 'pump
out' is selected.
Note:
Terminals
1, 3, 5 and 7
are common
20
19
9
8
7
4
3
Select
voltage
internally
Capacitance probe
N
L
4 - 20 mA transmitter output
to positioner card
(Max. loop resistance 500 W)
Input
Level input
+
Fig. 13
3 A max.
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