West Control Solutions Pro-16 - Manual (Page 25)

Operation
9499-040-93811 / 59537-1 Page 25 of 88 Pro-16
The following variables are available ( ConF / Lim / Src .x ):
Variable ( Src .x) Remark Alarm type
Process value Absolute
Control deviation xw Process value - effective set-point. The effective
set-point Weff is used. E.g with a ramp, this is the
changing set-point rather than the target set-point. Relative
Control deviation xw +
suppression after start-
up or set-point change
with time limit The alarm output is suppressed after switch-on or
after a set-point change, until the process value is
within the limits for the first time. At the latest
after elapse of time 10 x
ti1 the alarm is
activated ( ti1 = integral time 1; parameter r
Cntr). If ti1 is switched off (ti1 = OFF),
this is considered as Î , i.e. the alarm is not
activated before the process value was within the
limits once.
Relative
Effective set-point
Weff The effective set-point Weff for control. Absolute
Correcting variable y y = controller output signal Absolute
Deviation from SP
internal Process value - internal set-point. The internal set-
point is used. E.g. with a ramp, this is the target
set-point instead of the varying effective set-point
Weff. Relative
Control deviation xw +
suppression after start-
up or set-point change
without time limit After switch-on or after a set-point change, the
alarm output is suppressed , until the process value
is within the limits for the first time. Relative
g
During alarm configuration, the following functions can be selected
( ConF / Lim / Fnc.x ):
Function ( Fnc.x) Remark
Switched off No limit value monitoring.
Measured value Process value monitoring. When exceeding the limit, an alarm is
generated.The alarm is reset automatically, when the process
value is "within the limits" (including hysteresis) again.
Measured value + latch Process value monitoring + latching of the alarm condition. When
exceeding the limit value, an alarm is output. A latched alarm
persists, until it is reset manually.