PRÜFTECHNIK VIB 5.300 EX Series, Operating Instructions Manual

Page: 120 / 172

5-4
VIBXPERT 11.2010
Measurement tasks
RPM measurements
Machine speed (rpm) is measured using the laser trigger sensor (VIB
6.631). The sensor works with red laser light that is emitted from the
sensor head. The bundled laser beam hits a measurement mark on a
rotating shaft and is reflected back with every rotation. Every time
the trigger optics detect the light reflection, the sensor emits an
electrical impulse. The device uses the rate of occurrence of the
voltage pulses to calculate the shaft speed*.
Laser trigger sensor (VIB 6.631)
(technical data: see the sensor catalog)
Laser / sensor
Permissible angle deviation :
± 45° (reflective marker)
± 15° (contrast marker)
Laser trigger sensor
Shaft
(top view)
Do not look into the laser beam! Risk of eye damage!
Do not open the housing!
Attention!
Installation and adjustment
• Mount the laser trigger sensor on the machine with the trigger
stand (VIB 6.632). The maximum distance to the shaft is 2 meters.
• Apply a suitable measurement marker to the stationary shaft (e.g.
a reflective tape - VIB 3.306).
• Connect the laser trigger sensor to the measurement device using
the trigger cable (VIB 5.432-2.9).
• To adjust the system, point the laser beam at the measurement
marker while the machine is stationary.
To switch on the laser, start a RPM measurement. The laser beam
should be as perpendicular as posssible to the shaft surface and
shaft axis. The maximum permissible angle deviation depends on
the type of measurement marker.
* If shaft speed < 0,1 Hz (= 6 rpm),
then change the 'Keyphaser - Timeout'
setting in the Device setup (p. 2-23).
WARNING!