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Building Technologies Division Basic Documentation LME39… CC1P7106en
4 Type summary (other types on request) 08.12.2017
Note on parameterization:
Use the AZL2… or ACS410 to always set the exact value of the required time (multiples of increments of 0.147 seconds, 0.294 seconds or 4.851 seconds).
When parameterizing minimum or maximum times, the possibility of a ±7% tolerance must be taken into consideration.
For minimum values: The value to be parameterized must be at least 7% greater. For maximum values: The value to be parameterized must be at least 7% smaller.
Example: Prepurge time shall be set to 30 seconds
Calculation: 30 seconds + 7% = 32.1 seconds
Value to be parameterized
(parameter 225): Must be equal to or greater than the calculated value (e.g. 32,34 seconds)
Example: Safety time shall be set via the change of postignition time to 5 seconds
Special case here: Safety time is set directly via the change of postignition time and flame detection time using the following formula:
TSA = t3n + tfz = P257 + 0.3 seconds + P228
Calculation: 5 seconds - 7% = 4.65 seconds
t3n = 4.65 seconds - 0.3 seconds - P228
t3n = 4.05 seconds (with tfz = 0.3 seconds)
Value to be parameterized
(parameter 257): Must be equal to or smaller than the calculated value (e.g. 3.969 seconds)
Legend tfz Flame detection time t4 Interval between ignition OFF and release fuel valve 2
TSA
Safety time
t8
Postpurge time
tw
Waiting time
t10
Specified time for air pressure signal
t1
Prepurge time
t11
Programmed opening time for actuator
t1´
Purge time
t12
Programmed closing time for actuator
t3
Preignition time
t22
2nd safety time
t3n
Postignition time (parameter 257 + 0.3 seconds)
1)
Maximum running time available for actuator. The actuator’s running time must be shorter, otherwise, the actuator will not reach the required position
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