Adjusting The Superheat Controller - Siemens PolyCool Superheat CPS40 Manual De Instalación Y Servicio

MA became smaller
XP has been Increase XP again and continue with step d) until
increased MA begins to become larger. Then set XP back
to the value where MA was at its smallest value
(optimum value).
XP has been Decrease XP again and continue with step d)
decreased until MA begins to increase. Then set XP back to
the value where MA was at its smallest value
(optimum value).
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Siemens
Building Technologies
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 optimized as follows:
MA
MA
Start of plant
a) After switching on the plant, wait until the steady state condi-
tion has been reached which requires two to five minutes.
The drawing above shows the possible graph of the super-
heat during the start-up transient condition.
Determine the maximum deviation (MA) from the setpoint DT
b)
SP. Use display of superheating in regulation operation
mode for this.
c) Increase XP (e.g. double) or decrease XP (e.g. by half).
d) After changing XP, wait for at least two cycles and then re-
determine the deviation. The change in MA determines fur-
ther adjustments. Please read the table below.
e) Once you have determined the optimal value for XP, it prob-
ably 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.
Superheat - CPS40
Commissioning
DT SP
Cycle time
MA became larger
Reset XP to its original
value and then decrease
it. Continue with step d).
Reset XP to its original
value and then increase
it. Continue with step d).
Time
CE1U3372xx
2018-11-09