Thermal Shock Protection (Tss) Rafc - Siemens RWF 50.2 Installation, Use And Maintenance Instructions

Parameter
Function
FnCt
Function
Ramp slope
rASL
Ramp slope
Tolerance band
ramp
toLP
Tolerance band ramp

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
44/68
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8.3 Thermal shock protection (TSS) rAFC

The RWF50... can be operated as a fixed value controller with or without ramp
function.
ConF  rAFC 
Value/ Description
selection
0 Switched off
1 Gradient Kelvin/minute
2 Gradient Kelvin/hour

Slope of ramp slope (only with functions 1 and 2)
0.0...
999.9
Width of tolerance band (in K) about the setpoint
2 x |HYS1|
(only with function 1 and 2)
=
10...9999
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.

Cooling controller:
Smallest possible factory setting:
2 x |HYS4| = 10 K
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.
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).
Reference!
See chapter 5.7 Thermal shock protection (TSS).