BCU 560, BCU 565 · Edition 02.16
80
Parameters > Air control > Capacity control
IC 20 . .E
20 19 18
3 2 1
6
7
4
8
12 11
S3
S4
S1 0
OUT
0°
➔
90°
0°
90°
90°
➔
0°
IC 20..E
S1
S2
5
17 +
+
IN
OK
R
R
PE
A
D
A
D
R
1 2 3 4 5 6
ON
µC
13
15
16
M
PE
L1
N
S1
Min
Max
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 560..F1
3,15AT
µC
88
c
c
41
42
24V
DC
5 6
9
11 12
10
7
62 61
The positions for minimum capacity, maximum capacity and
ignition capacity can be set using the actuator. When the
appropriate position has been reached, this information is
signalled back via terminal 52. If no signal is received that the
position has been reached within the timeout time of 255 s,
a safety shut-down of the BCU will be performed and a fault
message (
A
,
A
or
A
) will be displayed, see page 50 (Fault
signalling). In addition, the actuator will be moved to the set
position for minimum capacity using the output at terminal 54.
The control system is enabled during 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 a controller
(0(4) – 20 mA, 0 – 10 V) using the setpoint device on terminals 17
and 18 or the bus signal. There is no timeout active in this case.
If bus control is active (parameter 75), the controller enable
output (terminal 56) has a different function.
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.
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