Siemens LMV5 Quick Start Manual page 98

Menu Path Parameter
State O2 Ctrl
Params & Display>
O2ContrGuard>
Gas/Oil Settings>
Air-related Load
Process Data
Diag Reg State
LMV5 QSG Rev 4
U = User O = OEM
S = Service
This displays what mode the O2 trim control is in. The modes with the definitons are:
0 = Deactivated - the trim is manually or automatically deactivated.
1 = Locked - the starting sequence of the trim is stopped. See "Diag Reg State" for more information.
2 = LockTStart - this signifies that the trim is waiting to engage. The trim will engage 10 * tau LF (tau LF is a
time delay that is typically auto set at low fire) after the burner sucessfully lights off.
3 = InitContr - after the trim engages, this is the large reducton in air rate (closing the air damper or slowing
the VSD) that is done after the 10 * tau time expires.
4 = LockTLoad - signifies that the O2 trim is engaged but not actively trimming due to a load change.
5 = active - the O2 trim is active and adjusting the air rate in small steps to achieve the O2 setpoint.
6 = LockTCAct - a increase and then pause of the air rate due to the measured O2 being below the O2
setpoint. The length of the pause is 5* tau
This is the load-position that any of the air-influenced Actuators are at when the O2 trim on the LMV is
U
trimming. The load position of the fuel Actuators always matches the load displayed on the normal operation
screen. The air related load can be the same or less than the fuel related load (on the normal operation
screen) but can never be greater. This is because the air influenced Actuators always move back down their
respective curves.
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
2 = the O2 sensor is being tested for response (the LMV5 does this periodically during 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 O2 Monitor curve (rich curve).
5 = Error in the PLL52 module
6 = Error in the Precontrol
Sec 4 Pg 42
Descriptions / Notes
60-62
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