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Building Technologies Division User Manual RWF50... CC1U7866en
Infrastructure & Cities Sector 8 Configuration ConF 25.07.2014
8.3 Thermal shock protection (TSS) rAFC
The RWF50… can be operated as a fixed value controller with or without ramp
function.
ConF rAFC
Parameter Value/
selection
Description
Function
FnCt
Function
0 Switched off
1 Gradient Kelvin/minute
2 Gradient Kelvin/hour
Note!
With FnCt = 1 or 2, Thermal shock protection (TSS) is
automatically activated as soon as the actual value drops below
the adjustable absolute limit value rAL (heating controller) or
exceeds it (cooling controller).
Ramp slope
rASL
Ramp slope
0.0...
999.9
Slope of ramp slope (only with functions 1 and 2)
Tolerance band
ramp
toLP
Tolerance band ramp
2 x |HYS1|
=
10...9999
Width of tolerance band (in K) about the setpoint
(only with function 1 and 2)
Heating controller:
Smallest possible factory setting:
2 x |HYS1| = 10 K
To monitor the actual value in connection with thermal shock protection
(TSS), a tolerance band can be laid about the setpoint curve. If the limit
values are crossed, the ramp is stopped.
Reference!
See chapter 5.7 Thermal shock protection (TSS).
Cooling controller:
Smallest possible factory setting:
2 x |HYS4| = 10 K
Note!
In the event of a faulty sensor or manual control, the ramp function is stopped. The outputs behave the
same way they do when the measuring range is crossed (configurable).
Functions Cold start of plant and Thermal shock protection (TSS) are interlocked.
Only one function can be activated, but never both at the same time.
Limit value
rAL
Ramp limit
0...250 Heating controller:
If the actual value lies below this limit value, the setpoint is approached in the
form of a ramp until final setpoint SP1 is reached.
Cooling controller:
If the actual value lies above this limit value, the setpoint is approached in
the form of a ramp until final setpoint SP1 is reached.
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