Siemens LME7 Series Basic Documentation page 79

14.5 Time tables and settings for program sequence PME73.820...
Type
TSA
tw
PME73.820...
max.
Requirements 2.5 3
Factory setting --- t3n+0.45 29.106+2.1
Max. 2.5 14 1237+2.1
Min. --- ---
Step size --- ---
Function parameter
1 Repetition in the event of loss of flame during operation
<2: None
= 2: 1 x
2 Valve proving
0: Inactive
1: active
Valve proving
3
0: During prepurge time (t1)
1: During postpurge time (t8)
4 Valve proving
0: According to P241.01
1: During prepurge time (t1) and postpurge time (t8)
5 Actuator position during prepurge time (t1) and postpurge time (t8)
0: Purging in low-fire
1: Purging in high-fire
6 Application with / without actuator
0: Without actuator
1: With actuator
Legend
tw Waiting time
TSA Safety time
t1 Prepurge time
t3 Preignition time
t3n Postignition time (P257 +0.3 seconds)
t4 Interval: End of safety time (TSA) - load controller (LR) release
t8 Postpurge time
1) Reaction time at change of signal by air pressure switch contact (open of air pressure switch (LP)) and response time in the event of loss of flame
2) Reaction time at change of signal by inputs (e.g. pressure switch-min (Pmin))
3) Flame detection time
4) Minimum time td1 + td2 + td3 + td4 if: Parameter P241.00 = 1 (ON), after mains ON, with lockout, P234 (postpurge time (t8)) = 0 (postpurging) or P241.01 = 0
5) Minimum time td1 + td2 + td3 + td4 if: Parameter P241.00 = 1 (ON) and P234 (postpurge time (t8)) >0 (postpurging) and P241.01 = 1
Building Technologies
HVAC Products
t1
t3 t3n t4
P225
P226 P257 P230
4)
min. approx. min.
min.
30 6 2.5 9
6.174 2.205+0.3 9.408
37.485 13.23+0.3 74.97
0+2.1 1.029 0+0.3 3.234
4.851 0.147 0.147 0.294
Parameter number
Basisdokumentation LME7...
14 PME73.820A2
Times in seconds
t8
t11 t12
P234 t10
P259 P260
5) approx.
approx. approx.
min.
15 15 300 300
19.404 13.818 300.762 300.762
1237 13.818 1237 1237
0 0 0 0
4.851 0.294 4.851 4.851
Factory setting
P240 0
P241.00 1
P241.01 1
P241.02 0
P515.00 1
P515.01 1
t10 Specified time air pressure switch (LP) state message (timeout)
t11 Opening time of actuator (timeout)
t12 Closing time of actuator (timeout)
td1 Test atmospheric pressure
td2 Test gas pressure
td3 Test space filling
td4 Test space evacuating
td1 td3
1) 2) 3) td2 td4
min. max.
--- --- --- 10 3
--- --- --- 10.29 2.646
1 0.45 0.45 37.485 2.646
0.3 0.3 --- 1.029 0
--- --- --- 0.147 0.147
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CC1P7105de
24.09.2009