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Installation and operating instruction
Combustion manager W-FM 100 und W-FM 200
6 Operation
83054802 1/2018-07 La
132-228
6.12.12.2 Multi-stage switch threshold
Param & Display
LoadController
ControlParam
ThreshStage2On
ThreshStage3On
Parameter
ThreshStage…On
stipulates the switch threshold for stage 2 and
stage 3. The switch threshold influences the switching of the stages.
If the actual value drops below
Sd_Stage1On
the W-FM forms the integral from
control deviation x time. When the value reaches
ThreshStage2On
(Q2)
stage 2 switches.
If the value reaches
ThreshStage3On
(Q3) before
Sd_Stage1On
is not
achieved, stage 3 switches.
Q2
Q2
Q3
Sd_Stage1Off
Sd_Stage2Off
Sd_Stage3Off
Setpoint (W)
Sd_Stage1On
Stage 1 (controller ON)
Stage 2
Stage 3
6.12.12.3 Low impact start
If a three stage burner is to be operated two stage with low impact start:
Set parameter
Sd_Stage2Off
and
Sd_Stage1Off
to the same value.
When
Sd_Stage2Off
is reached, the W-FM initiates a shutdown.
Set parameter
ThreshStage2On
to 0.
if the W-FM releases the load control, stage 2 switches immediately. Stage 3
only switches once the switch threshold (Q3) has been reached.