Siemens LMV 5 Series, Technical Instructions, Page: 81 / 374

LMV Series
Technical Instructions
LV5-1000
Menu Path Parameter Default Range Description
51.1 52.2 52.4
LEGEND - Password Access: (U)=User, (S)=Service, (O)=OEM, Shaded = Commonly Used, ** = Must Set, X = Has Function, / = Partial Function
LMV
Params & Display>
O2Contr/Alarm>
Gas/Oil Settings>
O2 Alarm
NumMinUntilDeact (S) 1 1-5
If the measured %O2 exceeds O2 MaxValue or goes lower than the O2 Alarm for a time
longer than
Time O2 Alarm
(O2 exceedances), then the O2 trim will deactivate. If parameter
OptgMode is set to 'O2 Control' during an exceedance, a lockout will occur. If parameter
OptgMode is set to 'ConAutoDeac' during an exceedance, then the O2 trim will temporarily
deactivate (burner keeps running on position control curves). If the measured %O2 comes
back between
O2 MaxValue and the O2 Alarm , then the O2 trim will attempt to reactivate.
This parameter determines how many times the O2 trim can deactivate and reactivate. This
parameter is valid only if
OptgMode is set to 'ConAutoDeac'. A setting of 1 = no repetitions,
a setting of 5 = 4 repetitions.
x x
Calc PI again (O) deact
activated
deactivated
If
Tau High-FireOEM
or
Tau Low-FireOEM
are manually adjusted, then the PI values need to
be recalculated based on the new Tau values. Setting this parameter to activated will
recalculate the high and low fire PI values. x x
Proportional band and integral component for O2 trim response. Automatically set based on
the Tau (delay time) measured at the
LowfireAdaptPtNo . Both the P and the I can be
manually adjusted, but this is typically not necessary.
This is the delay time that is automatically measured at LowfireAdaptPtNo . Delay time is
the amount of time that a fuel air ratio change at the burner takes to reach the O2 sensor in
the stack. The delay time is shorter at high fire and longer at low fire due to gas velocity
through the boiler.
x x
Tau Low-Fire (delay time at low fire) can be manually adjusted here if necessary, but manual
adjustment is typically not necessary.
x x
x x
x x
Read Only
Not Set
I Low-Fire (S)
Tau Low-Fire OEM (O)
Tau Low-Fire (U)
P High-Fire (S)
Params & Display>
O2Contr/Alarm>
Gas/Oil Settings>
Control Param>
PI
P Low-Fire (S)
Tau High-Fire (U)
0-500s
Not Set 1-60s
Not Set
3-500% x x
x x
x x
x x
Tau High-Fire (delay time at high fire) can be manually adjusted here if necessary, but
manual adjustment is typically not necessary.
This is the delay time that is automatically measured at high fire (the highest point in the
curve). See
Tau Low-Fire for explanation.
Proportional band and integral component for O2 trim response. Automatically set based on
the Tau (delay time) measured at high fire (the highest point in the curve). Both the P and
the I can be manually adjusted, but this is typically not necessary.
Not Set
3-500%
Not Set 0-500s
Not Set 1-60s
I High-Fire (S)
Tau High-FireOEM (O)
Read Only
SCC Inc. Page 23 Section 3
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