ABB ControlMaster CM10 User Manual page 22

ControlMaster CM10, CM30 and CM50
Universal process controllers,
CM30 CM50
Analog
Input 3
32
Analog
Input 4
33
Transmitter PSU
* Using internal transmitter power supply.
** Fit the CJ sensor supplied if Analog Inputs 3 or 4 are THC inputs.
(Alternatively, it is possible to use an external fixed cold [reference] junction, if the controller is
programmed for use with millivolt inputs and the appropriate thermocouple linearizer is selected.)
*** Analog Input 4 can be used only with THC inputs if Analog Input 3 is also used as a THC input.
**** For mA input types, to ensure loop continuity when the controller is switched off, fit a suitably rated
diode (for example, type 1N4148 or equivalent) as shown.
Note.3 Leads must have equal resistance, not exceeding 20 W each.
Fig. 4.11 ControlMaster CM30 and CM50 Optional Analog Inputs (3 and 4)
20
1 1 1
/ , / and /
8 4 2
THC
29 24
30 25
CJ**
31 26
+
27
mA, mV, V,
Digital Input
28 –
DIN
2-lead RTD
3-lead RTD
+ Resistance
3rd lead
RTD –
+
– RTD + RTD +
RTD –
RTD –
****
+ +
Milliamps*
mA
mV
****
V
Digital Input
–
Milliamps*
+
THC***
CJ Sensor
4 Installation
–
Tx
+
–
Tx
+
IM/CM/B–EN Rev. H