Siemens LME7 Series Basic Documentation page 94

Key to phases
Building Technologies Division
Infrastructure & Cities Sector
Phase Function
number
LOC Lockout shutdown phase
OFF Standby, waiting for heat request
oP Part 1: Request load controller OPEN
Part 2: Switching point fuel valve 2a (2nd stage) ON by actuator
Part 3: High-fire reached
Part 4: Request losf controller CLOSE
Part 5: Switching point fuel valve 2a (2nd stage) OFF by actuator
Part 6: Low-fire eached
10 Actuator travels to the CLOSED position, home run
21 Safety valve ON, air pressure switch in no-load position
Check if POC is closed, actuator travels to the CLOSED position
22 Part 1: Fan motor ON
Part 2: Specified time air pressure switch
Message (timeout), stabilization of air pressure switch
24 Opening time of actuator (timeout)
30 Part 1: Prepurge time without flame simulation test
Valve proving when...
parameter 241 = 1 after power ON lockout, or
parameter 234 (postpurge time) = 0 seconds
Part 2: Prepurge time with flame simulation test (2.1 seconds)
36 Closing time of actuator (timeout)
38 Preignition time
40 Postignition time, parameter 257 + 0.3 seconds
42 Flame detection
44 Interval: End of ignition safety time and release of load controller
72 Opening time of actuator (timeout)
74 Part 1: Operation is ended, check if postpurging is programmed
Part 2: Postpurge time
Valve proving when...
parameter 241 = 1, and
parameter 234 (postpurge time) >0 seconds
80 Test space is evacuated
81 Atmospheric pressure test
82 Test space is filled
83 Gas pressure test
90 Pressure switch-min open → safety shutdown
*) During the actuator's running phases, the actuator's feedback signal must fir
be OFF, then ON
*1 Valve proving when P241 = 1 after mains ON, lockout or P234 (postpurge
time) = 0 seconds
*2 Valve proving when P241 = 1 and P234 (postpurge time) >0 seconds
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CC1P7105en
29.11.2011