ControlMaster CM10, CM30 and CM50
Universal process controllers,
1
/8,
1
/4 and
1
/2 DIN 6 Basic Level
32 IM/CM/S–EN Rev. R
…Basic
Loop 1 Mot Valve
Example of Motorized Valve With Feedback
Motorized Valve Output Without Feedback (Boundless)
A motorized valve output without feedback (boundless) process controller provides an output that is effectively the time
derivative of the required regulator position (the controller signals the regulator, not where to go to [position derivative], but
in the direction to travel and how far to move) by a series of integral action pulses. Therefore, the controller does not need
to know the absolute regulator position and is not affected when the regulator reaches the upper or lower limit, as
determined by the regulator’s limit switches (hence the term ‘boundless’).
When a deviation from setpoint is introduced, the regulator is driven for a length of time equivalent to the proportional
step. The regulator is then driven by integral action pulses until the deviation is within the deadband setting.
To Next Page
Loading...
Need help?
General
