Siemens RWF 50.2, Installation, Use And Maintenance Instructions

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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

Parameter Value/
selection
Description
0 Switched off
1 Gradient Kelvin/minute
2 Gradient Kelvin/hour
Function
FnCt
Function

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)
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).
Tolerance band
ramp
toLP
Tolerance band ramp
2 x |
HYS1
|
=
10
...9999
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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