Control Action Too Fast - Siemens RVA63.242 User Manual

If not sufficient:
If not sufficient:
Siemens Building Technologies
Landis & Staefa Division
TKx
Control action of modulating burner too slow
TKx Actual value of the boiler temperature
TKw Boiler temperature setpoint
Procedure
1. Reduce Xp in steps of about 25 % of the previous value.
Reduce Tv in steps of 1 to 2 seconds (if value 0 is reached, the controller
2.
operates as a PI controller)
3. Reduce Tn in steps of 10 to 20 seconds
Repeat steps 2 and 3 alternately.

1.1.2 Control action too fast

If the control system's response is too "hefty" so that it starts oscillating, setting
parameters Xp, Tn and Tv must be increased in a stepwise fashion. A new
readjustment should be made only after the control action resulting from the previous
readjustment is completed.
TKx
Control action of modulating burner too fast
Procedure
1. Increase Xp in steps of about 25 % of the previous value.
2. Increase Tv in steps of 2 to 5 seconds.
3. Increase Tv in steps of 10 to 20 seconds.
Repeat steps 2 and 3 alternately.
Basic Documentation RVA53.242, RVA53.242
General control processes
TKw
t
TKw
t
189/218
CE1P2373E
26.03.2001