Siemens LMV5 Quick Start Manual page 143

Error Diag.
Device Display
code code
Any #
00
01
02
03
04
05
0A
0B
0C
0D
Internal Fault
16 LMV5
0E Basic Unit
0F
03
14
20
21
22
23
40
LMV5 QSG Rev 4
Meaning for the LMV5x system
Fault with Base Unit (LMV5) Ratio Control, O2 Trim, VSD
Basic unit has detected a plausibility fault in the ratio control
system.The diagnostic code describes the cause of the fault.
Ratio curve of the air actuator is not fully defined
Ratio curve of the fuel actuator is not fully defined
Ratio curve of auxiliary actuator 1 is not fully defined
Ratio curve of auxiliary actuator 2 is not fully defined
Ratio curve of auxiliary actuator 3 is not fullydefined
VSD curve is not fully defined
Calculated P-part outside the permissible range
Calculated I-part outside the permissible range
Calculated system delay time outside the permissible range
Calculated O2 setpoint outside the permissible range
Calculated O2 min. value outside the permissible range
Calculated O2 ratio value outside the permissible range
The load / point number predefined by the
AZL... lies outside the permissible range
Calculated standardized value lies outside the permissible
range
With hysteresis compensation: Permissible target positioning
range exceeded
The load / point number predefined by the AZL... lies outside
the permissible range
With a switch instruction, none of the defined cases was
satisfied
With the switch instruction, no defined ratio control phase has
been identified
Unplausible target positions
Sec 5 Pg 17
Corrective action
Insure that actuators that are addressed and activated
have their positions defined. Check curve points to see if
correct values have been entered for the actuator or
VSD. Readjust the ratio curve, if required
Check parameters ( P Low-Fire, I Low-Fire, Tau Low
Fire, P High-Fire, I High-Fire, Tau High-Fire) These
values nomally self-set when the delay time is
measured. Check the values of these parameters
against the maximum and minimum ranges. Readjust
O2 control curve if necessary.
The O2 control curve must be 1% O2 lower than the %
O2 measured at the ratio control curve, and 0.5% above
the O2 guard curve. Readjust curves.
If fault occurs sporadically improve EMC. If fault occurs
continously, replace LMV5
Check if the correct values have been entered for the
standardized values.
Readjust O2 trim control, if required, or repeat the
settings
If fault occurs sporadically improve EMC. If fault occurs
continously, replace LMV5
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