ABB CM30 User Manual

ControlMaster CM30 and CM50
Universal process controllers,
1
/4 and
1
/2 DIN 4 Installation
14 IM/CM/ED–EN Rev. B
4.5.3 Analog Inputs
Note. Standard terminal connections for inputs 1 and 2 are shown in Fig. 4.10. Optional analog inputs 3
and 4 are shown in Fig. 4.11.
Fig. 4.10 Standard Analog Inputs (1 and 2)
Fig. 4.11 ControlMaster CM30 and CM50 Optional Analog Inputs (3 and 4)
+

+

1
2
3
4

+
+


+
Tx
5

+
Tx
+
+
mA
mV
V
Milliamps*
THC
CJ**
THC***
3-lead RTD
mA
mV
V
2-lead RTD
RTD +
RTD –
RTD +
RTD –
Transmitter PSU
Analog
Input 2
Analog
Input 1
Milliamps*
RTD –
3rd lead
CJ 
Sensor
* Using internal transmitter power supply.
** Fit the CJ sensor supplied if Analog Input 1 or 2 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 2 can be used only with THC inputs if Analog Input 1 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-lead RTD: 3 leads must have equal resistance, not exceeding 20  each.
****
****
+

+

24
25
26
27

+
+


+
Tx
28

+
Tx
+
+
29
30
31
32
33
* 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  each.
mA
mV
V
Milliamps*
THC
CJ**
THC***
3-lead RTD
mA
mV
V
2-lead RTD
RTD +
RTD –
RTD +
RTD –
Transmitter PSU
Analog
Input 4
Analog
Input 3
Milliamps*
RTD –
3rd lead
CM30 CM50
CJ
Sensor
****
****

ABB CM30 Specifications

General

Product Name	CM30
Product Type	Controller
Manufacturer	ABB
Frequency	50 / 60 Hz
Protection Class	IP20
Mounting	DIN Rail
Operating Temperature	-25°C to +60°C