Siemens LMV37.4 Series - Page 137

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Building Technologies Basic documentation LMV37.4... CC1P7546en
12 Fan control 17.12.2018
Value Error Remedy
 Motor turns too slowly or too fast
-15 Speed deviation µC1 + µC2 The speeds between µC1 and µC2 deviated too much.
This can be caused by wrong standardized speeds (e.g.
after restoring a data set to a new LMV37.4)
→ repeat standardization and check the fuel-air ratio
-20 Wrong phase of phase manager Standardization was made in a wrong phase
 permitted are only phases 12
 load controller OFF, start standardization again
-21 Safety loop / burner flange open Safety loop or burner flange is open
 repeat standardization with safety loop closed
-22 Air actuator not referenced Air actuator is not referenced or has lost its reference.
1. Check if the reference position can be approached.
2. Check if actuators have been mixed up.
3. If error only occurs after standardization was
started, the actuator is possibly overloaded and
cannot reach the required position.
-23 VSD deactivated
Standardization was started with VSD deactivated
 activate VSD and repeat standardization
-24 No valid operating mode
Standardization was started with no valid operating
mode
→ select a valid operating mode and repeat
standardization
-25 Pneumatic fuel-air ratio control
Standardization was started with pneumatic fuel-air ratio
control
→ standardization with pneumatic fuel-air ratio control is
not possible
The result of speed standardization (100% speed) can be read out via parameter. The
speeds acquired by the 2 microcontrollers can differ by about 1.5%, the reason being
slightly different resonator frequencies.
No. Parameter
522 Ramp up
523 Ramp down
642.0 Standardized speed
Index 0 = speed 1
642.1 Standardized speed
Index 1= speed 2 (internal monitoring)
642.2 Fuel 1: Standardized speed
Index 2 = speed 3
642.3 Fuel 1: Standardized speed
Index 3 = speed 4 (internal monitoring)
645 Configuration of analog output
0 = DC 0...10 V
1 = DC 2...10 V
2 = DC 0/2...10 V

Note!
Different standardized speeds for fuel 0 and 1 in dual fuel operation are only
necessary if the internal speed control of the LMV37.4 is active and the LMV37.4 is
operated in mixed operation electronic fuel-air ratio control / pneumatic fuel-air ratio
control.