Using The O Alarm Functionality Without O Trim - Siemens LMV5 Series Technical Instructions

LMV Series
4. InitContr – O control is preparing to engage but is still locked
2
5. LockTLoad – O control is engaged but locked (in pre‐control) due to a load change
2
6. Active – O control is actively trimming based on setpoint and measured O
2
7. LockTCAct ‐ O control is engaged but locked due to an excursion from setpoint
2
If the state of the O control is shown as "locked", parameter Diag Reg State will show the reason why.
2
Diag Reg State
Menu path: Params & Display > O2 Contr/Alarm > Process Data
This parameter shows the reason that the O
0 – The load is below the load limit set by parameter O2 CtrlThreshold
1 – The load controller is in auto tune
2 – The O sensor is being tested for response (self‐check of O
2
3 – The fuel‐air ratio or O
2
4 – The measured % O is above the lean limit or below the rich limit
2
5 – There is an error in the PLL52 module
6 – There is an error in the pre‐control
Using the O Alarm Functionality without O
2
As was previously mentioned, the O
parameter OptgMode, which can be found using the following menu path:
Menu path: Params & Display > O2 Contr/Alarm > Gas/Oil Settings
The available operating modes are:
1. Man deact ‐ deactivates all O
2. O2 Limiter ‐ Only the O
MaxValue) is exceeded for a time longer than what is set for parameter Time O2 Alarm. Likewise, a
lockout will occur if the rich limit (O
parameter Time O2 Alarm. No trim functionality is active.
3. O2 Control ‐ The same as O2 Limiter, except O
will cause a lockout in the same way as the O2 Limiter mode.
4. ConAutoDeac – In this mode, exceeding the rich or lean limits will not cause an immediate lockout.
Exceeding the rich or lean limits will cause the O
time of 3 times Tau, the measured %O
the O trim will be deactivated. If the %O
2
trim can be automatically deactivated and reactivated the number of times allowed by parameter
NumMinUntilDeact. The maximum setting is 5. If more than 5 deactivations and reactivations
occur, then the O trim mode will be changed to "auto deact" until the O
2
re‐activated.
5. Auto deact ‐ indicates that the O
error codes in Section 7. Do not select this mode.
SCC Inc.
control is locked. Possible values are:
2
trim curves are being programmed
Trim
2
system can be run in different modes. The modes are set using
2
trim and O alarm functionality. %O
2 2
alarm is active. This means that a lockout will occur if the lean limit (O2
2
alarm curve) is exceeded for a time longer than what is set for
2
trim is now enabled. Exceeding rich or lean limits
2
will be re‐evaluated. If the %O
2
is lower than the rich alarm, a lockout will occur. The O
2
trim has been automatically deactivated for some reason. See
2
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sensor)
2
value can still be viewed.
2
trim to be temporarily deactivated. After a waiting
2
is higher than the rich alarm,
2
trim control is manually
2
Technical Instructions
Document No. LV5‐1000
value
2
2
Section 6