Siemens LMV37.4 Series Basic Documentation page 244

Error
Diagnostic code
code
20
21
22
23
24
25
128
255
83 #
0
Bit 0
Valency 1
Bit 1
Valency 2...3
Bit 2
Valency 4...7
Bit 3

Valency 8
244/267
Building Technologies
Meaning for the LMV37.4
Wrong phase of phase manager
Safety loop / burner flange open
Air actuator not referenced
VSD deactivated
No valid operation mode
Pneumatic fuel-air ratio control
Running command with no preceding standardization
No standardized speed available
Speed error VSD
Speed error when trim function is active
Lower control range limitation of control
Upper control range limitation of control
Interruption via disturbance pulses
Curve too steep in terms of ramp speed
Basic documentation LMV37.4...
29 Error code list (all LMV2 types / LMV3 types)
Recommended measures or causes
standardized speeds (e.g. after restoring a data set to a new LMV37.4)
→ repeat standardization and check the fuel-air ratio
Standardization was made in a wrong phase. Permitted are only phases  12
 load 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 operation mode
 activate valid operation mode and repeat standardization
Standardization was started with pneumatic fuel-air ratio control
 standardization with pneumatic fuel-air ratio control not possible
Attention!
If speed supervision is required in the pneumatic fuel-air ratio control, the
relevant parameters must be set (parameters 667 / 668 / 669) before
standardization.
VSD is controlled but not standardized
 make standardization
Motor turns but is not standardized
 make standardization
Required speed has not been reached
Increase parameter 662 (neutral zone in speed supervision) and parameter 663 (close range in
speed supervision)
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
CC1P7546en
17.12.2018