BCU 580 · Edition 11.15
72
In the event of a fault, the actuator is moved to the position set
via cam S4 for minimum capacity via the output at terminal 54.
0°
90°
S4
S1
S3
Burner control range
Butterfly valve setting range
Control range
Move to ignition position
Ignition pos.
Min.
pos.
Closed
pos.
Max. pos.
MIN
MIN
MIN
MAX
MAX
MAX
The control system is enabled for operation via the control-
ler enable output (terminal 56). During the controller enable
procedure, the actuator can be adjusted infinitely between the
positions for maximum and minimum capacity by an external
three-point step controller or using bus signals. There is no
timeout active in this case.
If bus control is active (parameter 75), the controller enable out-
put (terminal 56) has a different function. The wiring between
the BCU and the 3-point step controller can be adjusted so
that the control range of the actuator is between the positions
for maximum and ignition capacity.
53
54
55
56
52
1
2
3
46
45
65
66
67
68
49
50
51
17
18
37
38
13
14
15
BCU 580..F1
3,15AT
µC
88
c
c
41
42
24V
DC
5 6
9
11 12
10
7
62 61
PE
L1
N
3 2 1
16
6
7
4
8
12 11
15
13
S3
S4
S11
S10
0°
90°
M
IC 20
PE
S1
S2
90°
➔
0°
0°
➔
90°
S1
Min
Max
3PS
The minimum position which can be reached is the closed
position.
0°
90°
S4
S2
S1
S3
Burner control range
CLOSED
Butterfly valve setting range
Control range
Move to ignition position
Ignition pos.
Max. pos.
OPEN
S4
S2
Min.
pos.
Closed
pos.
MIN
MIN
MAX
MAX
Manual mode
In Manual mode, the actuator can be moved between the
positions for maximum and minimum capacity in 3-point step
operation. No timeout is active when approaching these posi-
tions. The controller enable output (terminal 56) is not active
and not checked.
Parameters > Air control > Capacity control
▼
