ABB ControlMaster Series User Manual

ControlMaster CM30 | Universal process controller,
1
/ 4 DIN | DS/CM30–EN Rev. L 13
Ratio controller
The ratio controller template configures the CM30 to regulate one process variable against another based on a specified ratio.
When using the ratio control template, the CM30's display shows the required ratio (setpoint) and the actual ratio achieved
(process variable).
In this example, a controlled amount of 'Flow B' is added to 'Flow A' at a ratio programmed into the CM30.
This template is available with or without an external ratio.
Ratio station
The ratio station template configures the CM30 as an indicator and setpoint generator.
In this example, the CM30 is calculating and indicating the ratio of flow A and flow B. The operator is able to enter the desired
ratio on the CM30; the CM30 then retransmits the setting to the slave controller. In many applications, the slave controller is a
blind or remotely-located device.
This template is available with or without an external ratio.
Fig. 21: Ratio controller
Fig. 22: Ratio station
Controlled Flow (Flow B)
Wild Flow (Flow A)
FT
FT
I/P
PV
O/P
RSP
Controlled Flow
(Flow B)
Wild Flow
(Flow A)
FT
FT
I/P
Slave
Controller
PV
O/P
RSP
O/P
Input 1
Input 2

ABB ControlMaster Series Specifications

General

Brand	ABB
Model	ControlMaster Series
Category	Controller
Language	English