39
6 - Special functions
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 Emust
be 2 (see page 17)
For example: M3 3100-2000
To select these functions use the
parameter:
Timer/Start-up
operator mode
(see page 35).
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
Start-up
function the
parameter
“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
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, the Start-up func-
tion passes to the “Off” phase.
6.1 START-UP FUNCTION continued on page 40
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