Manvar O2 Ctrl - Siemens LMV5 Series Technical Instructions

LMV Series
LEGEND - Password Access: (U)=User, (S)=Service, (O)=OEM, Shaded = Commonly Used, ** = Must Set, X = Has Function, / = Partial Function
Menu Path Parameter
CombEfficiency (U)
ManVar O2 Ctrl (U)
State O2 Ctrl (U)
Params & Display>
O2Contr/Alarm>
Process Data
Air-related Load (U)
Diag Reg State (U)
SCC Inc.
Default Range
Calculated combustion efficiency, based on wet O2 levels in the stack,
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combustion air temperature, and flue gas temperature.
This value represents how much the O2 control is trimming. Values less than 50% indicate
that the air-influenced actuators are farther closed than when the O2 was commissioned.
Values greater than 50% indicate that the air-influenced actuators are farther open than
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when the O2 was commissioned. When air temperature decreases (and air density
increases), this value should decrease. Conversely, when air temperature increases (and air
density decreases), this value should increase.
This displays the status of the O2 trim control.
1) deactivated - O2 trim is manually or automatically deactivated. System operates on ratio
control curve.
2) locked - the manipulated variable (amount of trim) is held at the last value.
3) LockTStart - trim is waiting to engage after lightoff. See NumberTauSuspend .
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4) InitContr - controller is being initialized (preparing to trim) and is still locked.
5) LockTLoad - the O2 trim is engaged but locked due to a load change. See parameter
LoadControlSuspend .
6) active - the O2 trim is active and adjusting the air rate in small steps to achieve the O2
setpoint.
7) LockTCAct - the O2 trim is engaged but locked due to an excursion from O2 setpoint.
This is the load-position of the air influenced actuators. If this number is less than the fuel
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related load at a given point, the air influenced actuators are trimming closed. If greater,
than the air influenced actuators are trimming open.
If State O2 Ctrl reads "locked", this diagnostic code reveals other information.
These diagnostic codes are:
0 = load is below load limit set in parameter O2 CtrlThreshold .
1 = the load controller is in auto-tune or in manual mode.
2 = the O2 sensor is being tested for response (the LMV5 does this periodically during
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operation).
3 = the fuel air ratio curves or the O2 trim curves are being programmed.
4 = the measured %O2 is below the %O2 set in the Low O2 Alarm curve.
5 = error in the PLL52 module.
6 = error in the precontrol.
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