17
GB
manual mode starts with an output value equal to
the last value in the auto mode)
NOTE: If P40 is different from "bUmp" and an open
loop servomotor control with feedback
potentiometer is programmed, the instrument will
reach the P40 value using the feedback
indication.
P41 = Conditions for output safety value
When P5 is different from "sm.Ol" the P41 possible
selections are:
0 = No safety value ("Standard" effect)
1 = Safety value applied when overrange or
underrange condition is detected.
2 = Safety value applied when overrange
condition is detected.
3 = Safety value applied when underrange
condition is detected.
When P5 is equal to "sm.Ol" the P41 possible
selections are:
0 = No safety value ("Standard" effect)
4 = When an overrange or an underrange
condition is detected the instrument will close
the OUT 1 (s) relay contact.
5 = When an overrange or an underrange
condition is detected the instrument will close
the OUT 2 (t) relay contact.
6 = When an overrange or an underrange
condition is detected the instrument will revert
the "standard" effect.
NOTE: For "Standard effect" see chapter "Error
messages".
P42 = Output safety value
This parameter is skipped when P41 = 0, 4, 5 or
6.
This value can be set
- from 0 to 100 % when one control output is
configured
- from -100 % to 100 % when two control outputs
are configured.
P43 = Digital filter on the displayed value
It is possible to apply to the displayed value a
digital filter of the first order with a time constant
equal to :- 4 s for TC inputs
- 2 s for linear inputs
nO.Fl. = no filter
fltr. = filter enabled
P44 = Control action type
p.I.D. - the instrument operates with a PID algorithm.
p.I. - the instrument operates with a PI algorithm.
P45 = Operative set point alignement at
instrument start up.
0 = The operative set point will be aligned to SP or
SP2 according to the status of the logic inputs
1 and the set of P50.
1 = The operative set point will be aligned to the
measured value and then it will reach the
selected set point with a programmable ramp
(see Grd1 and Grd2 operative parameters).
NOTE: if the instrument detects an out of range or
an error condition on the measured value it will
ever operate as P45 = 0.
LFS-servo-1-02.p65 1/14/02, 3:44 PM17
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