Adjusting The Superheat Controller - Siemens CPS 40 Installations- Und Bedienungsanleitung

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5.6 Adjusting the superheat controller

If the system wiring and all peripherals are okay, the plant
can be switched on. The default parameters for superheat
control (XP, TN and D) can be optimised as follows:
MA
MA
Start of plant
a) After switching on the plant, wait un
condition has been reached which requires two to fi
minute s. The drawing above shows the possible
graph of the superheat during the start-up transient
condition.
b) Determine the maximum deviation (MA) from the
∆T SP. Use display of superheating in
setpoint
regulation operation mode for this.
c) Increase XP (e.g. double) or decrease XP (e
half).
d) After changing XP, wait for at least two cycles an
then re-determine the deviation. The change in MA
determines further adjustments. Please read the table
below.
e ) Once you have determined the optimal value for XP, it
probably will not need any further changes.
f) Repeat steps c) to e) with TN in the place of XP.
g) Repeat steps c) to e) with D in the place of XP.
CPS40
∆T SP
Cycle time
til the steady state
CE1U3372XX / H 74 319 0555 0 a
Time
ve
.g. by
d
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22.09.2006