Glossary; Waiting Time T W; Safety Time On Start-Up T Sa; Ignition Time T Z - Honeywell Krom Schroeder BCU 480 Manual

Glossary

11 Glossary
11 .1 Waiting time t
01 02
t W
t Z
t SA
Once the start-up signal ϑ has been applied, the wait-
ing time t starts to elapse. During this time, a self-test
W
is conducted to detect errors in internal and external
circuit components. If no malfunction is detected, the
burner will start up.
11 .2 Safety time on start-up t
This refers to the period of time between switching on
and switching off of the pilot gas valve V1, when no
flame signal is detected. The safety time on start-up
t (3, 5 or 10 s) is the minimum operating time of the
SA
burner and automatic burner control unit.
11 .3 Ignition time t
If no malfunction is detected during the waiting time
t , the ignition time t
W Z
supplied to the pilot gas valve V1 and the ignition trans-
former and the burner is ignited. The duration of the
BCU 480 · Edition 03.16l
W
02 88
1
L1
14
4
5
V1
9
6
V2
22-23
24-25
t
SA
Z
then starts to elapse. Voltage is
ignition time is either 2, 3 or 7 seconds depending on
safety time t selected.
SA
11 .4 Flame simulation/Flame simulation
delay time t
LV
01
t W
t LV
An extraneous signal (flame simulation) is a flame sig-
nal that is detected, although there should be no flame
according to the program sequence. If such an extrane-
ous signal is detected, the flame simulation delay time
t starts to elapse. If the flame simulation is discontin-
LV
ued during the flame simulation delay time t
can be initiated or operation continued. Otherwise, a
fault lock-out occurs.
01 88
1
L1
14
4
5
V1
9
6
V2
22-23
24-25
t
, start-up
LV
79