Advertisement
Control sequence under fault conditions and lockout indication
Whenever a fault occurs, the sequence switch stops and with it the lockout indicator.
The symbol appearing above the reading mark indicates the type of fault:
No start
=
Interruption of
startup sequence
P
Lockout
Lockout
>
Interruption of
startup sequence
1
Lockout
I
Lockout
Lockout indicator
12/19
Building Technologies Division
Infrastructure & Cities Sector
One of the contacts is not closed (also refer to «Preconditions for burner startup»)
Extraneous light:
Lockout during or after completion of the control program
Examples:
– Nonextinguished flame
– Leaking fuel valves
– Faulty flame supervision circuit
No «OPEN» signal at terminal 8 from the changeover end switch «a»
Terminals 6, 7 and 15 are live until fault has been corrected
Does not apply to LAL1...:
No air pressure indication at the beginning of the air pressure check
Air pressure failure after the air pressure check
Defect in the flame supervision circuit
No positioning signal at terminal 8 from the auxiliary switch «m» for the low-fire posi-
tion
Terminals 6, 7 and 15 are live until fault has been corrected
No flame signal at the end of the safety time «TSA»
Flame signal has been lost during operation
LAL1
Burner control can immediately be reset after lockout:
– Do not press the lockout reset button for more than 10 seconds
The sequence switch always travels to the start position first
– After resetting
– After rectification of a fault that led to shutdown
– After each power failure
During this period of time, power is only fed to terminals 7 and 9...11.
Then, the LAL.... will program a new burner startup sequence
a-b
b-b´
b (b´)-a Postpurge program
LAL2..., LAL3...
Startup sequence
Idle steps
(with no contact confirmation)
CC1N7153en
23.05.2014
Advertisement
