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6 - Special functions
continued 6.1 START-UP FUNCTION
There are two possibilities:
A
Start-up Setpoint
lower than the local Setpoint.
The "Hold" phase starts when
the process variable PV
# s p. s U
achieves the
tolerance of 1 digit).
B
Start-up Setpoint
greater than or equal to the
local Setpoint.
When the process variable PV
achieves the local Setpoint (with a tol-
erance of 1 digit), the Start-up function
passes directly to the "Off" phase.
If, at the controller power-on, the
process variable PV is greater than
# s p. s U
the lowest between the
the working Setpoint , the next phase
("Hold" or "Off") will be executed
instead of the "Limy" phase.
D u r i n g
1285
" L i m y "
" H o l d " phas-
420
RUN
es the
is on.
Start-up
Setpoint
40
# s . p . s U
A
< local Setpoint SP
# s p. s U
power-on
(with a
PV
# s p. s U
OP=Op. H 5
with TC = 25%
1sec min.
st
1
"Limy" 2
≥ local Setpoint SP
# s . p . s U
B
and
power-on
PV
t h e
a n d
Ö
led
OP=Op. H 5
con TC = 25%
1sec min.
st
1
"Limy"
noise
1 digit
# t . h . s . U
40 digit
nd
rd
"Hold"
3
"Off"
noise
1 digit
40 digit
rd
3
"Off"
Setpoint SP
# t . h . s . U
# s p. s . U
st
nd
rd
1
"Limy" 2
"Hold"
3
"Off"
# s p. s . U
Setpoint SP
st
rd
1
"Limy"
3
"Off"
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