6
SPECIAL
FUNCTIONS
Two special functions are available:
6.1 Start-up
6.2 Timer
In order to have the above func-
tions the product code digit
E
must
be
2
(see page 17)
For example: M4 3100-
2
000
To select these functions use the
parameter:
T i m e r / S t a r t - u p
operator mode
(see page 36).
A
Selecting Timer or Start-up,
the Soft-start function is dis-
abled, therefore the para-
meters
#st.Op
and
#st.tM
will not
be shown.
(see page 27)
#t.Mod
By means of this function it is pos-
sible to manipulate the control
output when the controller is
switched on.
To configure
S t a r t - u p
function the
p a r a m e t e r
“Timer/Start-
up operating
mode” must be set to
# 1
.
Three parameters are associated
to the Start-up function, they
appear on the second group.
(see page 27)
Start-up
Setpoint
(
s.p. l
…
s.p. H
)
Start-up
hold time
(0…500 min.)
Output
high limit
(5.0%…100.0% min)
#Op.Hs
#t.h.sU
#s.p.sU
t.Mod
1
The Start-up function includes
three phases:
1
st
“Limy” - The control output is
limited to the
#Op.Hs
2
nd
“Hold” - The process variable
is maintained to the Start-up
Setpoint for the time fixed by
the parameter
#t.h.s.U
3
rd
“Off” - When the
#t.h.s.U
time
is elapsed the process variable
is maintained to the working
Setpoint.
Whether the process variable, for
any reason (e.g. load change),
decreases at a value lower than (
#s.p.sU
- 40 digits), the Start-up
function starts again from the
“Limy” phase.
When the Start-up is in Hold phase,
if the local Setpoint becomes lower
than the Start-up Setpoint or if the
operating mode changes to man-
ual, the Start-up function passes
to the “Off” phase.
6.1
START-UP FUNCTION
6 - Special functions
40
M4UK.ed6 20-05-2005 11:43 Pagina 40
