West Control Solutions N8840 - Manual (Page 35)

Configuration level
8840 profiler 35 Configuration parameters
Lim
Name Value range Description Default
Fnc.1 Function of limit 1 1
0 switched off
1 measured value monitoring
2 Measured value monitoring + alarm status storage. A stored
limit value can be reset via error list, è -key, Ò-key or a
digital input ( -> LOGI/ Err.r)
3 signal change (change/minute)
4 signal change and storage (change/minute)
Src.1 Source of imit 1 1
0 process value
1 control deviation xw (process value - set-point)
2 control deviation xw (with suppression after start-up and
set-point change)
After switch-on or set-point changing, the alarm output is
suppressed, until the process value is within the limits for the first
time. At the latest after elapse of time 10 ti1the alarm is activated
(ti1 = integral time 1; parameter r Cntr)
If ti1 is switched off (ti1 = 0), this is interpreted as Î , i.e. the
alarm is not activated, before the process value was within the limits
once.
3 measured value INP1
4 measured value INP2
5 measured value INP3
6 effective setpoint Weff
7 correcting variable y (controller output)
8 control variable deviation xw (actual value - internal setpoint)
= deviation alarm to internal setpoint
9 difference x1 - x2 (utilizable e.g. in combination with process
value function “mean value” for recognizing aged
thermocouples
Fnc.2 Function of limit 2 0
0 switched off
1 measured value monitoring
2 Measured value monitoring + alarm status storage. A stored
limit value can be reset via error list, è -key, Ò-key or a
digital input ( -> LOGI/ Err.r)
3 signal change (change/minute)
4 signal change and storage (change/minute)