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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 11 Fan control 01.12.2009
11.7 Acquisition of speed
11.7.1 Acquisition of speed with proximity switch
The actual speed is acquired by an inductive proximity switch which scans a metal sen-
sor disk. The sensor disk must be attached directly to the motor’s drive shaft. Speed ac-
quisition is safety-related. To facilitate the detection of the direction of rotation and to be
able to make the plausibility check with only one sensor, a sensor disk with angular
steps of 60°, 120° and 180° is used. It generates 3 pulse intervals of different length.
Speed acquisition is designed for the connection of different types of sensors.
Caution!
With electronic air-fuel ratio control, speed acquisition is safety-related!
We recommend using the AGG5.310 accessory set.
The absolute speed can be read out via the AZL2...
No. Parameter
935 Absolute speed
The current speed in standardized form can be read out via the AZL2...
No. Parameter
936 Standardized speed
Motor speed: 300...6500 1/rpm
100% speed: 650...6500 1/rpm
Sensor: Inductive sensor to DIN 19234 (Namur) or
Open Collector (pnp) at U
CEsat <4 V, UCEmin >DC 15 V
Power supply: DC 10 V, max. 15 mA
Switching current: >10 mA
Cable length: Max. 100 m (sensor cable must be laid
separately!)
Sensor disk
Sensor disk and speed sensor can be ordered as accessory set AGG5.310.
Bild 228/1108
0,1
ø
4
,
3
(
2
x
)
Number of tappets: 3
Angular steps: 60°, 120°, 180°
Accuracy:
±2°
Figure 47: Sensor disk
Speed input X74.4
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