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Building Technologies Basic documentation LMV37.4... CC1P7546en
12 Fan control 17.12.2018
12.7 Acquisition of speed
12.7.1 Acquisition of speed with proximity switch
The actual speed is acquired by an inductive proximity switch which scans a metal
sensor disk. The sensor disk must be attached directly to the motor’s drive shaft. Speed
acquisition is safety-related. To facilitate the detection of the direction of rotation and to
be able to make the plausibility check with only 1 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 fuel-air 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...14000 rpm
100% speed: 650...14000 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. 3 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 84: Sensor disk
Speed input X74 pin 4
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