Vibration Suppression (Hysteresis); Form Of Speed Output Signal - HBM T10FM Mounting Instructions

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7.5 Vibration suppression (hysteresis)

Low rotation speeds and higher relative vibrations between the rotor and the

stator can cause disturbance signals that reverse the direction of rotation.

Electronic suppression (hysteresis) to eliminate these disturbances is

connected at the factory. This suppresses disturbances caused by radial

stator vibration displacement of approx. 2 mm.

Fig. 7.7: Switch for switching off hysteresis

In the factory setting, two 90_ phase‐offset speed signals (5 V symmetrical,

complementary RS-422 signals) are available at the speed output (connector

2). You can double the pulse count set in each case by moving switch S6 to

the "On" position. Pin 3 then outputs the direction of rotation as a static

direction of rotation signal (pin 3 = +5 V, pin 7 = 0 V compared to pin 8), if the

shaft turns in the direction of the arrow (see Fig. 7.8). At a speed of 0 min

the direction of rotation signal has the last measured value.

HBM

Switch S5

T10FM

Hysteresis

Off

-1

A0894-5.2 en

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