Voltage And Current; 2-Wire Transmitter Input; Thermocouple; Resistance Thermometer (Rtd) - ABB C1900 Installation Manual

4.2.2 Voltage and Current – Fig. 4.5
Information. Input impedances:
Low voltage (mV)
Voltage
Current (mA)
4.2.3 2-wire Transmitter Input – Fig. 4.5
Power for the transmitter is supplied by terminal 6.
Note. The voltage across terminals 4 and 6 is 20V
(nominal). This is due to internal voltage drops across a
shunt resistor and measurement circuitry.
4.2.4 Thermocouple – Fig. 4.5
Use correct compensating cable between the thermocouple
and the terminals – see Table 4.1 (previous page).
Automatic cold junction (ACJC) is incorporated but an
independent cold (reference) junction may be used.
1
2
3
4
5
6
7
8
9
10
11
12
Note. Not applicable on Type 2 Modules.
A – Summary of Connections
3
6
B – Voltage
>10MΩ
>10MΩ
100Ω
+

Analog Output

–
–
see Note and Information
Analog Input – see B to H
Common
Logic 1
Logic Inputs – see Note and Information
Logic 2
Normally Open
Common Relay Output –
see Information
Normally Closed
–
3
4
+
C – Current
(non 2-wire transmitters)
Fig. 4.5 Channel Connections
4 ELECTRICAL INSTALLATION...
4.2.5 Resistance Thermometer (RTD) – Fig. 4.5
If long leads are necessary it is preferable to use a 3-lead
resistance thermometer.
If 2-lead resistance thermometers are used each input must
be calibrated to take account of the lead resistance.
4.2.6 Logic Inputs – Fig. 4.5
The two logic inputs accept either volt-free (switch) or TTL (5V)
input types and can be used for remote switching of many
recorder functions, e.g. chart stop/go, alarm acknowledgment,
totalizer reset etc. Refer to the
IM/C1900–PGR or IM/C1900–PGC.
4.2.7 Analog Output – Fig. 4.5
4.2.8 Relay Output – Fig. 4.5
Information. Relay specification:
Type
Voltage
Current
Loading (non inductive)
Isolation, contacts to earth 2kV r.m.s.
4
6
D – 2-wire Transmitter
Information. Not available on non-upgradable version
3
6
E – Thermocouple
–
4
5
6
+
G – 3-wire RTD
Programming Guide
single pole changeover
250V AC
5A AC 5A d.c.
1250VA
–
–
Tx
+
+
3
–
+
6
F – Low Voltage (mV)
Red
4
White
5
Red
6
H – 2-wire RTD & Resistance
,
250V d.c.
50W
See Note and
Information
–
+
Link
White
Red
7