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Honeywell BCU 370 User Manual
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BC
U 370 · Edi
ti
on 01.
19
77
Legend
10
Legend
88
Display
88
Bl
inking dis
play
Ready
Safet
y interlocks (limits)
Star
t-up signal
Co
ntr
oll
ed air fl
ow
Ignition transformer
Gas va
lve
Fl
ame signal
Ope
rat
ing signal
Fault signal
Rese
t
Input signal
Output s
ig
nal
Fl
ame s
imul
ation c
hec
k
p
Pre
s
sur
e sw
itc
h
(DL f
or air, DG for ga
s)
Ignition
/I
gnition posi
tion
Three
-point step cont
roller
M
Act
uator (
in connection diagram)
76
78
Table of Contents
Burner Control Unit BCU 370
1
Contents
2
Table of Contents
2
1 Application
4
Applications Example
6
Modulating-Controlled Forced Draught Burner
6
Tightness Control
6
Pilot Burner and Tightness Control
7
Controlling the BCU Via
8
Profibus Dp
8
Controlling the BCU and the Butterfly Valve Via
8
2 Certification
9
3 Function
10
Connection Diagrams
10
Bcu 370..I1
10
BCU 370 with Actuator IC 20
14
Capacity Control by Adjusting the Valve between the Open Position and a Separate Min Position
15
Bcu 370
16
Assignment of Connection Terminals
17
BCU 370 Program Sequence
19
Normal Start-Up
19
Quick Start, Butterfly Valve Waits in the Ignition
21
Position
21
Position
23
In the Closed Position
25
Controlled Air Flow
27
Tightness Control
28
Program Sequence
30
Profibus Dp
32
Safety-Related Control Signals
32
Bcsoft
33
Configuration, Master-Slave Procedure
33
Addressing
33
Network Technology
34
Configuration
34
Bus Communication
34
Program Status
36
Fault Message (Blinking)
37
Reaction to Process Faults
38
4 Parameters
40
Scanning the Parameters
42
Flame Control
42
Burner Flame Signal
42
Burner Switch-Off Threshold
42
UVS Check (1× in 24 Hours)
43
Behaviour During Start-Up
44
Minimum Burner Pause Time T
44
Burner Start-Up Attempts
44
Switch-On Delay Time T
45
Pre-Ignition Time T
45
St Safety Time on Start-Up, Burner/Pilot Burner VZ
45
Sa1
46
Fs1
46
Behaviour During Operation
48
Minimum Operating Time T
48
Controller Enable Signal Delay Time T RF
48
Safety Time During Operation T SB
48
Restart after Flame Failure During Operation
49
Last Fault Signal
49
V2 During Burner Operation
50
Monitoring/Tightness Control
51
Min. Gas Pressure Monitoring
51
Digital Input Function
51
Air Monitoring During Pre-Purge
52
Air Monitoring During Operation
53
Tightness Controll, Test Period T
54
Air Control
56
Valve Control
56
Pre-Purge
56
Quick Start Starts in
57
Pre-Purge Time T PV
58
Post-Purge Time T
59
Fan Run-Up Time T PN
60
Control Using PROFIBUS DP
61
Bus Control Activation
61
Bus Control Limitation
61
Manual Mode
63
Operating Time in Manual Mode
63
Fault Messages
64
The Last 10 Fault Messages
64
Password
64
User-Defined Password
64
5 Selection
65
Type Code
65
6 Project Planning Information
66
Cable Selection
66
Ionization Cable
66
UV Cable
66
Ignition Cable
66
Fan Control
67
Controlling the Butterfly Valve
67
Safety Interlock (Limits)
67
Too Many Remote Resets
67
Protecting the Ignition Unit from Overload
68
Wiring
68
Single-Electrode Operation with External Ignition
68
Unit
68
BCU Switched off
68
Note on EC Type-Examination or CSA and FM
69
Approval
69
Contact Fuses
69
Installation
69
Protective Circuits
69
Bcsoft
69
7 Flame Control
70
With Flame Rod
70
With UV Sensor
70
8 Accessories
71
High-Voltage Cable
71
Bcsoft
71
Opto-Adapter PCO 200
71
Radio Interference Suppressed Terminal Boots
71
Connection Kit BCU 370
71
Set of Stickers BCU 370
71
GSD Master Data File for BCU 370
72
9 Technical Data
73
Profibus Dp
74
Operating Controls and Dimensions
75
Converting Units
76
10 Legend
77
11 Glossary
78
Safety Shut-Down
78
Fault Lock-Out
78
Warning Signal
78
Timeout 25 S/250 S
78
12 Annex
79
Status and Fault Messages for PROFIBUS DP
79
Feedback
82
Contact
82
5
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Honeywell BCU 370 Specifications
General
Brand
Honeywell
Model
BCU 370
Category
Control Unit
Language
English
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