C1300
Advanced circular chart recorder
5 Electrical Installation
IM/C1300 Rev. J
69
5.2.2 Voltage and Current
5.2.3 2-wire Transmitter Input)
Power for the transmitter is supplied by terminal 6.
5.2.4 Thermocouple
Use the correct compensating cable between the thermocouple
and the terminals – see Table 5.1 on page 68.
An automatic cold junction (ACJC) is incorporated but an
independent cold (reference) junction may be used.
5.2.5 Resistance Thermometer (RTD)
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.
5.2.6 Logic Inputs
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. – see Section 3.11, page 47.
5.2.7 Analog Output
5.2.8 Relay Output
Note.
Input impedances:
Low voltage (mV)
>10M
Voltage
>10M
Current
(mA)
100
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.
Note.
Relay specification:
Type
single pole changeover
Voltage
250V AC
250V DC
Current
5A AC
5A DC
Loading (non inductive)
1250VA
50W
Isolation, contacts to earth 2kV RMS
Fig. 5.5 Channel Connections
A Summary of Connections
1
2
7
8
9
10
11
12
Analog Output (
see Note below
)
+
Relay Output
Normally Open
Common
Normally Closed
Logic Inputs (
see Note below
)
Common
Logic 1
Logic 2
Analog Input see
B
to
H
3
4
5
6
D 2-wire Transmitter
4
6
+
+
Tx
See Note below
B Voltage
3
6
+
C Current
(non 2-wire transmitters)
*
3
4
+
G 3-wire RTD
4
5
6
Red
White
Red
E Thermocouple
3
6
+
H 2-wire RTD & Resistance
5
6
White
Red
Link
4
F Low Voltage (mV)
3
6
+
*
Recommended diode:
Diode forward voltage must be > 0.8 V @ 20 mA or use 2 x 1N4001 general purpose diodes in series.
Note.
Not applicable on Type 2 Modules.