2-Stage Burner, Analog Output; Safety Shutdown; Predefined Setpoint - Siemens RWF40.000A97 User Manual

5.2.4 2-stage burner, analog output

5.3 Safety shutdown

Functions

5.4 Predefined setpoint

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In this case, a standard binary signal switches the second stage into circuit with analog
output «X1» on reaching the switch-on threshold «HYS1» and switches it out of circuit
at the lower switch-off threshold «HYS2».
HYS3
HYS2
W
HYS1
100%
X1
0%
(1)
F
The modulating controller must be available and configured in the unit
(optional).
ð
Section 8.2 «C112 limit comparator, controller type, setpoint «SP1», locking»
In the event of a sensor failure, the controller cannot monitor the actual value of the
boiler temperature (analog input 1). Safety shutdown will automatically be triggered to
guard against overheating.
This also applies to the acquisition of the external setpoint at analog input 2.
- Burner off
- Floating output for closing the actuating device
- Self-setting is ended
- Manual operation is ended
The setpoint is preselected within preset limits using the buttons, an external analog
signal or the interface.
It is possible to shift the setpoint, either by an analog or binary signal, to influence it
according to the weather, or to change it via an external contact.
CC1B7865en
5. Operating modes
q A
(2)
05.12.2002
B
7865w04/1099
q
A
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