Siemens Synco 200 - Deviation Message (DV ALM)

9.11 Deviation message (DV ALM)
9.11.1 Activation
For the main controlled variable of an RLU2… universal controller, a deviation
message can be generated.
Deviation message
relay of universal
controller
To activate the function, connect the DV ALM output of the controller block to any
Q… switching output of the RLU2… controller.
yp p p yp
xxx
x
Q
LIM SEQLIM CAS/CON
1CTLOOP 1
SEQ2 Y SEQ2 P SEQ1 Y SEQ1 P SEQ4 Y SEQ4 P SEQ5 Y SEQ5 P DV ALM
SUPPLY
yy
Q1...
3101Z17
The universal controllers RLU232 and RLU236 also only have one deviation
message relay. Both the CTLOOP 1 and CTLOOP 2 sequence controllers always
act on the same relay.
Notes
The "Deviation message" function is not available with the RLU220 controller.
9.11.2 Operating principle
The deviation message monitors the following values:
Monitored values
• Difference between actual value and setpoint
• Sequence controller at limit
• Message delay time
If a control loop is operating at the limit (all heating sequences fully open and all
cooling sequences fully closed, or vice versa) and the set difference between
actual value and setpoint is exceeded, the controller triggers a fault status
message after an adjustable period of time.
Trigger
You can set individual message delay times for the upper and lower limits (DV
DLYH, DV DLYL). This also allows for monitoring plants that provide heating only or
cooling only.
The controller presents the deviation message as a fault status message at the Info
level like this:
Presentation
• Bell icon blinks
• Sequence controller 1 icon is visible
• Indication whether the deviation occurred in the heating or cooling sequences
SERVICE
1
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Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008