BCU 580 · Edition 11.15l 75
Parameters
10.6 Air control
10.6.1 Capacity control
Parameter 40
The BCU is fitted with an interface for connecting air
actuators.
The BCU..F1/F2 activates a control element via the out-
puts for capacity control (terminals 53 to 56) for purg-
ing, cooling or starting the burner. This control element
moves to the required position for the relevant operat-
ing situation.
The BCU..F3 activates an air valve for purging, cooling
or starting the burner via the output at terminal 10. The
required air capacity is released by the air valve.
Using parameter 40, you can set which actuator is used
for capacity control (actuators IC 20, IC 40, RBW or air
valve).
Parameter 40 = 0: Off; no capacity control (no air actua-
tor).
Parameter 40 = 1: with IC 20.
The interface is configured to the requirements of ac-
tuators IC 20, IC 20..E, IC 50 or IC 50..E.
Alternatively, comparable three-point step actuators
may be used.
IC 20
53 54 55 56
52
65 66 67 68
49 50 51
17 18 37 38
13 14 15
BCU 580..F1
µC
88
c
c
41 42
24V
DC
5 6 9 11 1210762 61
PE
L1
N
3PS
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
The positions for maximum capacity, ignition capacity
and minimum capacity can be set using the actuator.
It is checked whether the relevant position has been
reached using terminal 52. If the position is not reached
within the timeout time of 255 s, the BCU will display
fault message A , A or
A (maximum, ignition or minimum capacity not
reached), see page 51 (Fault signalling).
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