109
6.7
Input Connections
Make connections to each input – see Fig 6.7.
Refer to Table A on the rear fold-out for the
default input assignment settings.
6.7.1
Thermocouple (THC) Inputs
Note. Use the correct compensating cable
between the THC and the terminals – see
Table 6.1.
Automatic Cold Junction Compensation (ACJC) is
incorporated by use of CJ sensors wired across the
input terminals of I/P1 and I/P3 – see Fig. 6.11.
Alternatively, the CJ sensor can be mounted remotely
at the point where the thermocouple cable terminates
into copper cable, e.g. where cables enter an
instrument panel – see Fig. 6.12.
It is possible to use an external, fixed, cold (reference)
junction if the instrument is programmed for use with
millivolt inputs and the appropriate thermocouple
linearizer is selected. This is possible only via the PC
Configurator.
6
INSTALLATION…
0%
100%
Motorized
Valve
Drive
(N)
N
L
(L)
Motorized
Valve
Drive
Valve
Positioner
Power
Supply
0%
100%
Link
0%
100%
34
33
35
8
9
5
6
–
+
A – Relay Connections
Motorized Valve
Drive
B – Feedback Connections
(V, mA or mV Input Types)
C – Feedback Slidewire
Connection
100
Ω
(mA inputs
only)
33
34
35
D – Alternative Feedback
Slidewire Connection
34
33
Motorized Valve
Drive
Link
7
–
+
28
29
30
Copper
cable
I/P1
Compensating
cable
–
+
33
34
35
I/P3
6.6
Motorized Valve Connections – Fig. 6.10
Note. Relays used to drive the motorized
valve must be set for 'Normally Open' operation –
see Section 6.3.1.
Note. The wire link must be
connected at the motorized valve end,
NOT to the instrument terminals.
Fig. 6.10 Motorized Valve Connections
Fig. 6.11 CJ Sensor – Connections
Fig. 6.12 Remote-mounted
CJ Sensor – Connections
