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12 .3 .3 UVD control
An additional voltage supply of 24 V DC is required to
operate the UV sensor for continuous operation UVD 1
in conjunction with burner control unit BCU 580. The
24 V DC voltage supply and the 0 – 20 mA current out-
put of the UV sensor must be wired separately.
The 0 – 20 mA current output is not required for normal
operation. The 0 – 20 mA current output can only be
used to display the flame signal. If it is used for the dis-
play in a control room for example, then the cable to the
control room must be screened.
Alternating pilot burner (Parameter 79 = 0):
ϑ1
62 61
Permanent pilot burner (Parameter 79 = 1):
L1
24 V
1
Luft
0 V
2
min
UVD1
3
4
5
6
0–20 mA
+
–
ϑ1
62 61
72 72
P73
BCU 580 · Edition 11.15l
I
5 6 7 8
9
10
11 12
c
c
24V
DC
3,15AT
88
5 6 7 8
9
10
11 12
c
c
µC
2
1
max. 1 A;
24 V DC,
N
250 V AC
V4
V3
V2
V1
2
mA
1
max. 1 A;
107
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