Notes on Controller Settings
4–137
IP244
C79000–B8576–C860–02
4.6 Determining the System Parameters for 2/3-Step
Controllers (when Main Control Byte 1, Bit 2 = 0)
The heating and cooling curves of temperature-controlled systems are plotted with a recorder (see
Fig. 4.6/1).
The procedure is as follows:
– main control byte 1, bit 2 = 0
– entry of non-critical control parameters
T
A
= 5 s (numerical value 5000)
K
R
= 1 (numerical value 100)
T
N
, T
D
= 0
Upper limit of the control zone = 30 _C
Lower limit of the control zone = 30 _C
HKV = 100 % (for 3-step controllers)
– Enter the setpoint temperature
➀.
! The module switches the heating on.
– Wait until the actual value has ”settled”
➁.
Note: the actual value does not need to have reached the setpoint.
– Enter setpoint temperature = 1 _C
➂.
! The module switches the cooling on.
Note:
➁ and ➂ only required with 3-step controllers.
The parameters are then obtained from the curve:
T
U
= delay time (in s)
S
K
= maximum slope of the cooling curve (in _C/s)
S
H
= maximum slope of the heating curve (in _C/s)
Time
! "#
Tempe-
rature
!
!!"
! "# "#
!!
!!"
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