Siemens LME71.000A1 - Time table and settings for program sequence PME71.901...

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Building Technologies Division Basic Documentation LME7... CC1P7105en
Infrastructure & Cities Sector 12 PME71.901... 29.11.2011
12.3 Time table and settings for program sequence PME71.901...
Type Times in seconds
PME71.901... tw
TSA
max.
t1
P225
4)
min.
t3
P226
min.
t3n
P257
ca.
t4
P230
min.
t8
P234
5)
min.
t10
P224
ca.
t11
ca.
t12
ca.
1) 2) 3)
td1
td2
min.
td3
td4
max.
Requirement 2.5 3 20 3 2.5 15 4 15 60 60 --- --- --- 10 3
Factory setting --- t3n+0.45 19.404+2.1 3.087 2.205+0.3 15.582 4.851 13.818 58.212 58.212 --- --- --- 10.29 2.646
Max. 2.5 14 1237+2.1 37.485 13.23+0.3 74.97 1237 13.818 --- --- 1 0.45 0.45 37.485 2.646
Min. --- --- 0+2.1 1.029 0+0.3 3.234 0 0 --- --- 0.3 0.3 --- 1.029 0
Step size --- --- 4.851 0.147 0.147 0.294 4.851 0.294 --- --- --- --- --- 0.147 0.147
Function parameter Parameter number Factory setting
Air pressure switch input
0 = inactive
1 = active
P235 0
Repetition in the event of loss of flame at the end of safety time
<2: None
= 2: 1 x
= 3: 2 x
= 4: 3 x
P240.00 0
Repetition in the event of loss of flame during operation
<2: None
= 2: 1 x
P240.01 0
Valve proving
0: inactive
1: active
P241.00 0
Valve proving
0: During prepurge time
1: During postpurge time
P241.01 1
Valve proving
0: According to P241.01
1: During prepurge time and postpurge time
P241.02 0
Legend
tw Waiting time t10 Specified time air pressure switch state message (timeout)
TSA Safety time t11 Opening time of actuator (timeout)
t1 Prepurge time t12 Closing time of actuator (timeout)
t3 Preignition time
t3n Postignition time (P257 +0.3 seconds) td1 Test atmospheric pressure
t4 Interval: End safety time - load controller release td2 Test gas pressure
t8 Postpurge time td3 Test space filling
td4 Test space evacuating
1) Response time to a change of signal by the air pressure switch (opens)
and response time in the event of loss of flame
2) Response time to a change of signal by the inputs
(e.g. pressure switch-min)
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) = 0 (postpurging) or P241.01 = 0
5) Minimum time td1 + td2 + td3 + td4 if: Parameter P241.00 = 1 (ON) and P234 (postpurge time) >0 (postpurging) and P241.01 = 1