Siemens RVL471 - Pulse Lock

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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 11 Function block "3-position actuator heating circuit" 23.10.2002
N2
w
N2
w
N1
= w
N2
+ w
2522S07
w
N2 +
w
w
N1 Boiler temperature controller (heat generation)
N2 Flow temperature controller (heating zone)
w
N1
Setpoint of boiler temperature controller
w
N2
Setpoint of flow temperature controller
∆w Excess mixing valve temperature (set on controller N2)
11.5 Pulse lock
If, during a period of time that equals five times the running time, the actuator has re-
ceived only closing pulses, additional closing pulses delivered by the controller will be
locked. This minimizes the strain on the actuator.
For safety reasons, the controller delivers a one-minute closing pulse at 10-minute
intervals.
An opening pulse negates the pulse lock.
Example