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

4.2.2 Voltage and Current – Fig. 4.5
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
1
12
Note. Not applicable on Type 2 Modules.
A – Summary of Connections
3
6
B – Voltage
* Recommended diode:
Diode forward voltage > 0.8 V @ 20 mA or use 2 x 1N4001 general purpose diodes in series
>10MΩ
>10MΩ
100Ω
+
Analog Output (See below)
Note
–
Analog Input – see B to H
Common
Logic 1
Logic Inputs (See
Note
Logic 2
Normally Open
Common

Relay Output

Normally Closed
–
3
4
+
C – Current
(non 2-wire transmitters)
Fig. 4.5 Channel Connections
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.
IM/C1900–PGR or IM/C1900–PGC.
4.2.7 Analog Output – Fig. 4.5
4.2.8 Relay Output – Fig. 4.5
Relay specification:
Type
Voltage
Current
Loading (non inductive)
Isolation, contacts to earth
4
6
D – 2-wire Transmitter
(not available on non-upgradeable version)
below)
3
6
E – Thermocouple
–
Red
4
White
5
Red
+ 6
G – 3-wire RTD
*
4 ELECTRICAL INSTALLATION...
Refer to the
Programming
single pole changeover
250V AC
5A AC
1250VA
2kV RMS
–
–
Tx See
+
+
3
–
+
6
F – Low Voltage (mV)
Link
4
White
5
Red
6
H – 2-wire RTD & Resistance
,
Guide
250V DC
5A DC
50W
below
Note
–
+
9