There are two possibilities:
A Start-up Setpoint
#sp.sU
lower than the local Setpoint.
The “Hold” phase starts when
the process variable PV
achieves the
#sp.sU
(with a
tolerance of 1 digit).
B Start-up Setpoint
#sp.sU
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
the lowest between the
#sp.sU
and
the working Setpoint , the next phase
(“Hold” or “Off”) will be executed
instead of the “Limy” phase.
D u r i n g t h e
“ L i m y ” a n d
“ H o l d ” phas-
es the
Ö
led
is on.
420
1285
RUN
Start-up
Setpoint
41
6 - Special functions
A
#s.p.sU
< local Setpoint SP
B
#s.p.sU
< local Setpoint SP
noise
Setpoint SP
PV
40 digit
1 digit
#t.h.s.U
#t.h.s.U
#sp.s.U
power-on
OP=
Op.H5
with TC = 25%
1sec min.
1
st
“Limy” 2
nd
“Hold”
3
rd
“Off”
1
st
“Limy” 2
nd
“Hold”
3
rd
“Off”
noise
Setpoint SP
PV
40 digit
1 digit
#sp.s.U
power-on
OP=
Op.H5
con TC = 25%
1sec min.
1
st
“Limy”
3
rd
“Off”
1
st
“Limy”
3
rd
“Off”
M4UK.ed6 20-05-2005 11:43 Pagina 41