ABB ControlMaster CM10 User Manual page 21

ControlMaster CM10, CM30 and CM50
Universal process controllers,
CM30 CM50
Analog
Input 3
Analog
Input 4
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 2V7 Zener diode as shown.
Note. 3 Leads must have equal resistance, not exceeding 20  each.
Fig. 4.11 ControlMaster CM30 and CM50 Optional Analog Inputs (3 and 4)
IM/CM/S–EN Rev. R
1 1 1
/ , / and / DIN
8 4 2
3-lead RTD
THC
3rd lead
RTD +
CJ**
RTD –
mA, mV, V,
Digital Input
****
2-lead RTD
+ Resistance
RTD –
mA
mV
RTD +
V
Digital Input
RTD –
THC***
4 Installation
Milliamps*
****
Milliamps*
CJ Sensor
19