HBM TIM-EC Montageanleitung Seite 35

Ф
M
(t)
Fig. 10.10 Required configuration for the CASMA filter to function
Fig. 10.10 shows the CASMA filter with the required input parameter. "M
measurement and "Ф" the angular velocity. "M
angular velocity. "Ф". With each pulse, the current torque measurement is accepted into
filter and the last value is cleared from the filter. Then the sum of the measured values in
the filter is divided by the number of values to be averaged (n), and the result is output.
With the "D" input, the angle of rotation pulses can be divided down via an internal divisor.
This can be necessary when working over a wide angle range and high angle resolution.
Information
The maximum number of measured values that can be averaged is n
you must ensure that this value is not exceeded. The number of n can be reduced by using
the divisor.
You must also ensure that the angle of rotation pulses do not arrive any faster than the
torque measurements. Otherwise the calculation of the moving average will be incorrect,
as the applied torque measurement will be taken into account more than once in the aver­
age value filter. This means that the maximum permissible rotational speed must be
defined and taken into account in the active CASMA filter.
In the TIM-EC, the CASMA filter is only available in signal path TP1. In signal path TP1, the
filter can be switched on ć or switched (OFF) to bypass mode.
TP1
Fig. 10.11 Signal path
TIM-EC
SETTINGS
CASMA filter
n
CASMA filter
D
" is the moving average subject to the
(Φ)
ON/OFF
TP1: PROFINET/UDP
M
(Φ)
" is the torque
(t)
= 4096 values. So
max
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