ABB ControlMaster CM30 - Analog Inputs - CM30 and CM50 Controllers

ControlMaster CM30, CM50 and CMF310
Universal process controllers,
1
/4,
1
/2 DIN and fieldmount 4 Installation
18 IM/CM/ED–EN Rev. X
4.6.3 Analog Inputs – CM30 and CM50 Controllers
Note. Standard terminal connections for inputs 1 and 2 are shown in Fig. 4.16. Optional analog inputs 3
and 4 are shown in Fig. 4.17.
Fig. 4.16 Standard Analog Inputs (1 and 2) – CM30 and CM50 Controllers
Fig. 4.17 Optional Analog Inputs (3 and 4) – CM30 and CM50 Controllers
mA
mV
V
Digital Input
Milliamps*
THC
CJ**
THC***
3-lead RTD
2-lead RTD
+ Resistance
RTD +
RTD –
RTD +
RTD –
Transmitte r PS U
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 2V7 Zener
diode as shown.
Note. 3-lead RTD: 3 leads must have equal resistance, not exceeding 20  each.
****
****
mA, mV, V,
Digital Input
* 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.
Milliamps*
THC
CJ**
THC***
3-lead RTD
2-lead RTD
+ Resistance
RTD +
RTD –
RTD +
RTD –
Transmitter PSU
Analog
Input 4
Analog
Input 3
Milliamps*
RTD –
3rd lead
CM30 CM50
CJ
Sensor
****
****
mA
mV
V
Digital Input
mA, mV, V,
Digital Input