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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 11 Fan control 01.12.2009
Value Error Recommended measures
-6 Unplausible sensor signals
The required pulse pattern (60°, 120°, 180°) has not
been correctly identified.
1. Speed sensor does not detect all tappets of the
sensor disk
→ check the distance.
2. As the motor turns, other metal parts are detected
also, in addition to the tappets
→ improve mount-
ing.
3. Electromagnetic interference on the sensor lines
→
check cable routing, improve EMC.
-7 Invalid standardized speed
Standardized speed measured does not lie in the
permissible range.
1. Motor turns too slowly or too fast.
-15 Speed deviation µC1 + µC2
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 fuel-air ratio
-20 Wrong phase of phase manager
Standardization was made in a wrong phase.
1. Permitted are only phases
≤12 → controller OFF,
start standardization again.
-21 Safety loop / burner flange open
Safety loop or burner flange is open.
1. 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 star-
ted, 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 standardi-
zation
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.
Parameter
642.0 Standardized speed of μC1
642.1 Standardized speed of μC2
11.12 Control of fan motor with pneumatic air-
fuel ratio control
If the control of the fan motor is employed for burners with pneumatic air-fuel ratio con-
trol, only the control path is used. There is no need to connect a speed feedback signal
and to have speed control (for operating modes, refer to chapter
Selection of operating
mode
).
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