Data Exchange with the Central Controller
IP244
C79000–B8576–C860–02
4–34
Approximate values (very general):
""# % ! % ! %#! *! !(# % ! % ! %#! *!
& $& )%#
+
%! + %! +
Notes: If the control zone is too restricted (0 to 4 C) the control action is similar to that
of a purely switching controller (bimetallic controller).
The control zone has nothing to do with the previously described tolerances. The
tolerances are simply for monitoring, whereas the upper and lower limits of the
control zone are controller parameters.
%
! %#! *!
# !#
! %#!#
!"#%!
%"! %
&$ !(#
! %#! *!
!! % (% ,$%" ! %#!#$ !# !! ,$%" ! %#!#$
"&% '# (% % ,$%" ! %#!#$
""# ! %#! *!
%"! %
"&$ &""#
! %#! *!
!(# ! %#! *!
%"! %
% % (% ,$%" ! %#!#$ !# % ,$%" ! %#!#$
"&% '# (% !! ,$%" ! %#!#$
Fig. 2.1/2 Upper and lower control zones
Examples
a) With zone control, bit 1 in control byte 2 = 0
ZONOB = 20 C
ZONUN = 30 C
Setpoint = 200 C
Control zone = 170 C to 220 C
b) No zone control active, bit 1 in control byte 2 = 1
ZONOB = 1600 C/h
ZONUN = 1600 C
Setpoint = 220 C
Control zone = 0 to maximum value (in C)
c) Setpoint ramp, bit 1 in control byte 2 = 1
ZONOB = 200 C/h
ZONUN = irrelevant
Setpoint = 300 C
Control zone = 0 to maximum value (in C)
The setpoint is reached in 1.5 hours following the ramp slope if the previous actual value was 0 C.
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