Siemens LMV37.4 Series Basic Documentation page 221

Error
Diagnostic code
code
7
15
20
21
22
23
24
25
128
255
83 #
Bit 0
Valency 1
Bit 1
Valency 2...3
Bit 2
Valency 4...7
Bit 3

Valency 8
Building Technologies Division
Industry Sector
Meaning for the LMV37.4... system
Invalid standardized speed
Speed deviation µC1 + µC2
Wrong phase of phase manager
Safety loop / burner flange open
Air actuator not referenced
VSD deactivated
No valid operating mode
Pneumatic air-fuel ratio control
Running command with no preceding standardization
No standardized speed available
Speed error VSD
Lower control range limitation
Upper control range limitation
Interrupt shutdown due to electromagnetic interference
Curve too steep in terms of ramp speed
Basic documentation LMV37.4...
29 Error code list
Remedy
The standardized speed measured does not lie in the permissible range
 motor turns too slowly or too fast
The speeds of microcomputer 1 and 2 deviated too much. This can be caused by wrong standardized
speeds (e.g. after restoring a data set to a new unit)
→ repeat standardization and check the air-fuel ratio
Standardization was made in a wrong phase. Permitted are only phases  12
 controller OFF, start standardization again
Safety loop or burner flange is open
 repeat standardization with safety loop closed
Air actuator has not been referenced or has lost its referencing.
1. Check if the reference position can be approached.
2. Check if actuators have been mixed up.
3. If error only occurs after the start of standardization, the actuator might be overloaded and
cannot reach its destination.
Standardization was started with VSD deactivated
 activate the VSD and repeat standardization
Standardization was started without valid operating mode
 activate valid operating mode and repeat standardization
Standardization was started with pneumatic air-fuel ratio control
 standardization with pneumatic air-fuel ratio control not possible
VSD is controlled but not standardized
 make standardization
Motor turns but is not standardized
 make standardization
Required speed has not been reached
Speed has not been reached because control range limitation has become active
 for measures, refer to error code 80
Speed has not been reached because control range limitation has become active
 for measures, refer to error code 80
Speed has not been reached due to too much electromagnetic interference on the sensor line
 for measures, refer to error code 81
Check speed differential between the curvepoints and the modulating operating ramp setting
(parameter 544).
1. Modulating operating ramp 32 seconds
Curve slope max. 10% for LMV37.4 ramp of 20 seconds (20% for 10 seconds or 40% for 5 seconds)
2. Modulating operating ramp 48 seconds
Curve slope max. 10% for LMV37.4 ramp of 30 seconds (20% for 15 seconds or 30% for 10 seconds)
3. Modulating operating ramp 64 seconds
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CC1P7546en
20.09.2013