BCU 580 · Edition 11.15
71
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 outputs for
capacity control (terminals 53 to 56) for purging, cooling or
starting the burner. This control element moves to the required
position for the relevant operating situation.
The BCU..F3 activates an air valve for purging, cooling or start-
ing 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 actuator).
Parameter 40 = 1: with IC 20.
The interface is configured to the requirements of actuators
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
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
3PS
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
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 ter-
minal 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
Parameters
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