9.5.7 Control parameters (Xp, Tn, Tv)
You can set the following control parameters for each configured sequence:
Setting possibilities
• SEQx XP (P-band Xp)
• SEQx TN (integral action time Tn)
• SEQx TV (derivative action time Tv)
If you use all parameters, the result is a PID control loop.
If you want P, PI or PD control action, make the following settings:
Setting Result
SEQx TN = 00:00; SEQx TV = 00:00 P-control
SEQx TV = 00:00 PI-control
SEQx TN = 00:00 PD-control
We recommend the following standard values for quick controller commissioning:
Recommendations for
commissioning
• P-band Xp of the controller:
Room and extract air control loops 1…2 K / 2…4% r.h., supply air control loops
5 K / 10% r.h.
• Set the integral action time Tn equal to the greatest time constant of the
controlled system
• Set the derivative action time Tv equal to the time constant of the sensor
Apply the following procedure if the control loop is hunting:
1. Set Tn and Tv to 00:00.
2. Increase Xp (e.g. double it)
3. Add Tn again, starting with the value shown above.
Increase Tn if the control loop starts hunting again.
4. Add Tv again, starting with the value shown above.
Reduce Tv if the control loop starts hunting again.
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Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008
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