West Control Solutions Pro-8 - Manual (Page 26)

g
The variable to be monitored can be selected separately per configuration for
each alarm.
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 .
Operation
Alarm handling 26
Pro-8