Siemens LMV51.100C1 User Manual

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Building Technologies Basic Documentation LMV5... CC1P7550en
7 Boiler controller / load controller 22.05.2018
7.8 Cold start thermal shock protection (CSTP)
Thermal shock protection can be activated and deactivated.
A differentiation is made between modulating and multistage control.
The cold start sequence is activated when, upon startup, the actual value lies below the
ON threshold).
If thermal shock protection is activated, the manipulated variable on cold start is
increased in a stepwise fashion using the set load step (or the next stage is activated).
The output is increased as soon as the actual value exceeds the start value of the load
stage by the setpoint step.
If this switching threshold is not reached within the adjustable maximum time, heating is
automatically ensured by the next output stage. When the OFF threshold is reached,
the cold start sequence is ended to switch to normal control operation.
An active cold start thermal shock protection function is signaled via the AZL5; to check
the actual values, the normal display flashes up alternately.
Parameters: Thermal shock protection on/off ColdStartOn
Activation value for thermal shock protection ThresholdOn
Deactivation value for thermal shock protection ThresholdOff
Load step (for modulating control only) StageLoad
Setpoint step, modulating StageStep_Mod
Setpoint step, multistage StageStep_Stage
Max. time, modulating per step MaxTmeMod
Max. time, multistage per step MaxTmeStage
7.8.1 Cold start thermal shock protection – modulating
operation
For the output step, any output value in % can be predefined.
100% divided by the output step gives the number of possible stages.
Example:
Example:
Burner OFF
Actual temperature
below ON threshold.
The burner is switched
on.
Example:
If the actual temperature
has not reached the
setpoint step of 4 °C within
5 minutes, a load step
occurs.
Example:
If the temperature increases by 4 °C
within 5 minutes, the next load step
occurs.
Example:
Once the shock protection deactivation
threshold of 60 °C has been reached,
cold start thermal shock protection is
ended.
Control operation is started.
7
5
5
0
d
4
7
e
/
1
1
1
2
Figure 61: Cold start thermal shock protection – modulating operation

Siemens LMV51.100C1 Specifications

General

Brand	Siemens
Model	LMV51.100C1
Category	Control Unit
Language	English