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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 28 Error code list 01.12.2009
Error
code
Diagnostic code Meaning for LMV37.4... system Recommended measures
73 #
Internal error air-fuel control: Position calculation
multistep
23 Output invalid No valid output
26 Curvepoints undefined Adjust the curvepoints for all actuators
75 #
Internal error air-fuel ratio control: Data clocking
check
1 Current output different
2 Target output different
4 Target positions different
16 Different positions reached
Can be caused by different standardized speeds (e.g. after restore of data set) when the VSD is
activated
→ standardize again and check adjustment of the air-fuel ratio control system
76 # Internal error air-fuel ratio control
Make a reset; if error occurs repeatedly, replace the unit
Basic unit could not correct the difference in speed and reached a control range limit.
1. Basic unit is not standardized for this motor
→ repeat standardization.
Caution!
Settings of air-fuel ratio control must be checked!
80 # Control range limitation of VSD
2. Ramp time settings of the VSD are not shorter than those of the basic unit (parameters 522,
523).
3. Characteristic of the VSD is not linear. Configuration of the voltage input at the VSD must
accord with that of the basic unit (parameter 645).
4. VSD does not follow quickly enough the changes of the basic unit. Check settings of the VSD
(input filter, slippage compensation, hiding different speeds)
1 Control range limitation at the bottom VSD speed was too high
2 Control range limitation at the top VSD speed was too low
81
1 Interrupt limitation speed input
Too much electromagnetic interference on the sensor line
→ improve EMC
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