Spirax Sarco TVA Series - Page 24

IM-P192-02 MI Issue 224
Fig. 20 TVA with EIA 232 (RS232) Communications and 4-20mA wiring diagram.
Remote NPN input
(maximum 28 V)
M750 display unit
with 4-20 mA active
input (supplying
current loop)
1
Power
0 Volts
R
Or R  10 kW
EIA 232 (RS 232)
Communication port
(RJ11 socket)
Pulse Loop
+ - +-
Remote PNP input
(maximum 28 V)
Power
0 Volts
R
2
3
4
5
N
L
230 V
50 Hz
Fuse 1A
Loop powered
4-20 mA
display unit or
chart recorder
9 - 28 Vdc
+
-
+
-
Superheat pressure sensor
pin header connection