BCU 370 · Edition 01.19 39
Function
Process fault BCU 370’s reaction
Signal
(terminal)
Signal status During program step
Controlled shut-down
Timeout 25 s
Immediate fault lock-out
Safety shut-down
Start-up attempts
1)
Restart
2)
Fault message
DL (7) drops
08
Operation
8
drops
C1
Controlled air flow
P
ϑ (21)
drops
XX
All except t
SA1
+ t
SA2
drops
04
t
SA1
3)
drops
06
t
SA2
3)
Safety interlock (24) drops
XX
All
6)
50
Flame (13) pending
0
"no flow" state check
01
pending
1
Operating position check
01
pending
P1
Pre-purge time
01
pending
A2
Valve moves to Ignition position
01
pending
02
Waiting time
01
not pending after t
SA1
04
t
SA1
04
drops
05
t
FS1
05
drops
06
t
SA2
06
drops
07
t
FS2
07
drops
H8
Controller enable waiting time
08
drops
08
Operation
08
1}
According to parameter 07. If the last start-up attempt fails, a fault lock-out occurs.
2}
According to parameter 08. If the restart fails, a fault lock-out occurs.
3}
Safety time elapses completely.
4}
BCU restarts as soon as the signal is applied again.
5)
The program sequence is blocked.
6)
4) and 5)
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