Sequence Times; Standby; Startup - Siemens LMU54 Series Basic Documentation

Sequence times

Standby

Startup

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According to the sequence diagram, there is a permitted tolerance band with an upper
and a lower limit for each level (e.g.
N_XX_Delta».
«
The relevant sequence phases (refer to the sequence diagrams) are queried for these
limits.
Example: Ignition load
These limit values are complemented by
sequence diagrams).
NoG_Max» is the maximum speed that must never be reached.
«
speed that must be crossed when changing to standby.
Time Min. Max.
(s) (s)
TNB 0.2 21.0
TLO 0.2 51.0
TNN 0.2 51.0
THL1 0.2 51.0
THL2 0.2 51.0
tv 0 51.0
TBRE 0.2 51.0
TW1 0.2 51.0
tvz 0.2 5.0
TSA 1.8 9.8
2)
tsa1 0.2 9.6
2)
tsa2 0.2 TSA-tsa1
ti 0.2 10
tn 0 51.0
1)
Lockout position or start repetition, depending on the flame signal and the parameter;
various parameterization choices (refer to relevant description)
2)
With parameterization with abortion of safety time in the case of flame detection, the times
of «tsa1» and «tsa2» are derived from the time of establishment of flame. It should be
noted, however, that «TSA» can never be exceeded
The following phases (with associated times in parentheses) are relevant with one
startup / shutdown cycle:
• PH_STANDBY (unlimited): Burner control waits for a heat demand signal from the
controller
• PH_STARTVER: No external or internal release, relevant diagnostic code is delivered
The change from «Standby» to «Operation» is the startup triggered by a heat demand
signal from the controller.
If startup takes place with prepurging, startup will commence with the
phase; if no prepurging is used, with the
Basic Documentation LMU54... / LMU64...
3 Functions
N_ZL»), which is defined via parameter
«
upper limit = N_ZL» +
« «
lower limit = N_ZL» - N_ZL_Delta»
« «
NoG_Null» and
«
Response
Description
at end of
Lockout position Afterburn time
Lockout position Open LP
Lockout position Down to speed = 0
Lockout position First fan runup time
Lockout position Second fan runup time
Switching Prepurging
Lockout position Brake time until ignition load is reached
Waiting for internal sequence, speed
Lockout position
readjustment and optimization of
combustion
Switching Preignition time
1) Ignition safety time
1) Ignition safety time with ignition
1) Ignition safety time without ignition
Switching Interval operation
Switching Postpurging
PH_THL1_2» phase.
«
N_ZL_Delta»
NoG_Max» (refer to the
«
NoG_Null» is the low
«
PH_THL1_1»
«
CC1P7494en
07.11.2002