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Program sequence
Define working sequence, timing, failure control program
1.Normal start up
As receiving the start-up signal, TBC2800 implements the flame
simulation during T1(waiting time). If it doesn't detect the flame
signal, T2(safety time on start-up) elapses along with driving the
gas valve and ignition transformer. After T2 pasts and the flame
signal is received, the operation signal contact between terminals
17 and 18 closes. The LED display indicates the current program
status 3 .
2 No flame signal during start-up
If no flame signal is detected during T2, the fault lock-out occurs,
i.e. the valve closes, the fault signal contact between terminals 12
and 13 closes. During the entire safety time on start-up T2, the
gas valve is open. The LED display blinks and indicates 2 .
Flame simulation
3.
As receiving the start-up signal, TBC2800 implements the flame
simulation during T1 (waiting time).
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If the flame is detected during T1, TBC2800 starts the flame simu-
lation delay time T5. If the flame disappears during T5, the burner
.
will start up. Otherwise the fault lock-out occurs. The LED display
blinks and indicates 1.
Lock-out immediately or restart once after flame fail
4.
They can be set according to the application requirements.
The immediate lock-out is default.
1). Lock-out immediately after fault
TBC2800 will perform the fault lock-out after flame failure during
operation T3. At the same time, the gas valve is closed. The fault
signal contact between terminals 12 and 13 closes. The LED dis-
play blinks and indicates 3.
2).Restart once after fault
TBC2800 will perform one time restart after flame failure during
operation T3. The gas valve is closed and the operating signal
contact is open. Now TBC2800 attempts to restart once. If it
fails, the fault
cates 2 . If the flame signal is detected within the safety time T2
on restart, The LED display indicates the current program
status 3 .
Switch-off in succession occurs during a start-up
5.
too often
If switch-off occurs more than three times in succession during a
start-up, an inadmissible quantity of non-combusted gas can
reach the combustion chamber during T2 via open gas valves. A
fault lock-out occurs. The LED display blinks 4.
2
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lock-out occurs.
The LED display blinks and indi-
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