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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 11 Fan control 01.12.2009
Speed sensor
2
Figure 48: Speed sensor
Selection of fan motor
Motor supplier:
Selection of a motor
with a threaded hole M8 x 15 at the end of the fan motor’s drive
shaft.
Standard motor and machining (drilling hole and cutting thread M8 x 15).
11.7.2 Acquisition of speed with Hall generator
If the speed is acquired via a Hall generator, the requirements for safety-related applica-
tions are the same as those for the speed feedback signal via sensor disk.
Required is an asymmetric signal with the 3 pulses of 60°, 120° and 180° for the detec-
tion of the direction of rotation.
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