Actuators; Ic 20 - Honeywell Krom Schroder BCU 580 Technical Information

Project planning information

12 .4 Actuators

If actuators are used, the start gas rate of the burners
must be limited for SIL 3 applications in compliance
with the standard.
V1
VAS
Process control (PCC)
FCU 500
ϑ1 A
1 2
17 18 37 38
BCU 580..C0F2
42
46
µC
43
HT
49
P
50
57
53 55 51 52 5
02–04 06–08 04 06–08 04
ϑ1
1
ϑ2
2
t
BCU 580 · Edition 11.15l
p
u PZL GZL
2
V3
VAS 1
HT
V2
P
P69 P70
VAG
V4
P70 P70
VAS 1
P71
PLC
0,6 × I
N
L1 +24 V
ϑ2
3
4
41
1
2
13
14
15
9
8
10 16
µC
4
12
M
12
7
IC 40 + BVA
ϑ1

12 .4 .1 IC 20

The BCU..F1 checks the position to which the actuator
ϑ2
IC 20 has moved using terminal 52 (feedback) by lifting
the signal to terminal 53, 54 or 55, see page 129 (Lift-
ing).
To ensure this check is possible, BCU..F1 and actuator
IC 20 or equivalent three-point step actuators must be
wired as shown in the connection diagram.
P72 P72
P73
TZI/TGI
I
62 61 5 6 7 8 9 10 11 12
c
c
24V
DC
3,15AT
88
µC
BCU 580
max. 1 A;
24 V DC,
250 V AC
V4
V3
V2
V1
0 V N
108