Honeywell Krom Schroder BCU 580 - Page 76

BCU 580 · Edition 11.15l 76
Parameters
In the event of a fault, the actuator is moved to the posi-
tion 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
controller enable output (terminal 56). During the con-
troller enable procedure, the actuator can be adjusted
infinitely between the positions for maximum and mini-
mum 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 en-
able output (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 actua-
tor is between the positions for maximum and ignition
capacity.
53 54 55 56
52
1 2 3 4645
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 1210762 61
PE
L1
N
3 2 116 67 4812 1115 13
S3 S4
S11
S10
0° 90°
M
IC 20
PE
S1S2
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 ap-
proaching these positions. The controller enable output
(terminal 56) is not active and not checked.
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