IC 40 · Edition 07.18
39
analogue
chart 2
analogue
chart 1
t [s]
high
low
closed
DI 1
DI 2
t [s]
t
1
t
2
Function
Operating mode 25
The adjustment angles for the “open” position of the
characteristic curves chart 1 and chart 2 can be set
mutually independently. The adjustment angle for the
“open” position of chart 2 may thus also be higher than
that of chart 1.
The burner continues to be operated in intermittent
mode so as to ensure a uniform temperature distribu-
tion even with low heat output.
DI 1
DI 2
Position
Off
Off
low/closed
On
Off
analogue chart 1
Off
On
low/closed
On
On
analogue chart 2
The opening speed is preset via the time t
1
for the entire
“low” to “high” setting travel.
Accordingly, the closing speed is set with t
2
for the en-
tire “high” to “low” setting travel.
The speeds are retained in both intermittent modes.
The “high” position can be selected correspondingly
lower in order to obtain longer running times (> 25.5 s).
The “high” position does not limit the adjustment angle
for the “open” position but only defines the speeds. The
adjustment angles for the “open” position are preset by
the current signal.
Consequently, “high” position may also be lower than
the “analogue chart” positions. If no analogue value is
preset, the actuator remains in “low” position (“closed”
position).
Possible parameter set for this operating mode:
P68030, see page 45 (Parameter sets).