Thermal Shock Protection (Tss) Rafc - Siemens RWF50.3 User Manual

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
44/64
Building Technologies Division
Infrastructure & Cities Sector

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

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).
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.

Reference!
See chapter 5.7 Thermal shock protection (TSS).
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.
User Manual RWF50...
8 Configuration ConF
CC1U7866en
25.07.2014