Pulse Lock - Siemens RVL471 Basic Documentation

Example
50/118
Siemens Building Technologies
HVAC Products
w = w + w
N1 N2
N1 Boiler temperature controller (heat generation)
N2 Flow temperature controller (heating zone)
w Setpoint of boiler temperature controller
N1
w Setpoint of flow temperature controller
N2
∆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.
Basic Documentation RVL471
11 Function block "3-position actuator heating circuit"
w w
N2 +
w
N2
w
N2
CE1P2524E
23.10.2002