West Control Solutions N8800 - Manual (Page 30)

4.2 Configuration parameters
Configuration level
Configuration parameters 30 8800 process controller
Cntr
Name Value range Description Default
SP.Fn
Basic configuration of setpoint processing 0
0 set-point controller can be switched over to external set-point
(-> LOGI/ SP.E)
8 standard controller with external offset (SP.E)
C.tYP Calculation of the process value 0
0 standard controller (process value = x1)
1 ratio controller (x1/x2)
2 difference (x1 - x2)
3 Maximum value of x1and x2. It is controlled with the bigger
value. At sensor failure it is controlled with the remaining
actual value.
4 Minimum value of x1and x2. It is controlled with the smaller
value. At sensor failure it is controlled with the remaining
actual value.
5 Mean value (x1, x2). With sensor error, controlling is
continued with the remaining process value.
6 Switching between x1 and x2 (-> LOGI/ I.ChG)
7 O
2
function with constant sensor temperature
8 O
2
function with measured sensor temperature
C.Fnc Control behaviour (algorithm) 1
0 on/off controller or signaller with one output
1 PID controller (2-point and continuous)
2 ∆ / Y / Off, or 2-point controller with partial/full load
switch-over
3 2 x PID (3-point and continuous)
4 3-point stepping controller
5 3-point stepping controller with position feedback Yp
6 continuous controller with integrated positioner
C.dif
Output action of the PID controller derivative action 0
0 Derivative action acts only on the measured value.
1 Derivative action only acts on the control deviation
(set-point is also differentiated)
mAn
Manual operation permitted 0
0 no
1 yes (r LOGI / mAn)
C.Act
Method of controller operation 0
0 inverse, e.g. heating
1 direct, e.g. cooling
FAIL
Behaviour at sensor break 1
0 controller outputs switched off
1 y = Y2
2 y = mean output. The maximum permissible output can be
adjusted with parameter Ym.H. To prevent determination of
inadmissible values, mean value formation is only if the
control deviation is lower than parameter L.Ym.