Thermcraft XST-6-0-36-3V - Manual (Page 215)

Installation and Operation Handbook Tuning
2416 Controller 4-7
4.4 MOTORISED VALVE CONTROL
The 2416 can be configured for motorised valve control as an alternative to the standard PID
control algorithm. This algorithm is designed specifically for positioning motorised valves.
These are ordered, pre-configured, as Model numbers:
• 2416/VC motorised valve controllers
• 2416/VP motorised valve controllers with a single setpoint programmer
• 2416/V4 motorised valve controllers storing four setpoint programs.
Figure 1-8 in Chapter 1 shows how to connect a motorised valve controller. The control is
performed by delivering open, or close, pulses in response to the control demand signal.
The motorised valve algorithm operates in the so-called boundless mode, which does not
require a position feedback potentiometer for control purposes.
The desired control mode is selected in the ‘
inst’ list in configuration level.
The following parameter list will appear in the navigation diagram shown in Chapter 2, if
your controller is configured for motorised valve control.
Name Description Values
mtr
Motor list Min Max Default
tm Valve travel time in seconds.
This is the time taken for the valve to travel from
its fully closed position to its fully open position. 0.1 240.0 30.0
In.t Valve inertia time in seconds.
This is the time taken for the valve to stop moving
after the output pulse is switched off. OFF 20.0 OFF
bAc.t Valve backlash time in seconds.
This is the minimum on-time required to reverse
the direction of the valve. i.e. the time to
overcome the mechanical backlash. OFF 20.0 OFF
mp.t Output pulse minimum on-time, in seconds. Auto 100.0 Auto
U.br Valve sensor break strategy. rESt, uP, dwn rESt
Table 4-3 Motorised valve parameter list