Filters To Eliminate Resonance Frequency - Fagor CNC 8060 Installation Manual

2.5.26
2.
CNC 8060
CNC 8065
(R : 1709)
EF
·188·

Filters to eliminate resonance frequency.

FILTER
Filter table.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
This parameter shows the tables to configure the frequency filters. Up to 3 different filters
may be defined for each axis or spindle, hence being possible to eliminate several resonance
frequencies.
Frequency filters may be applied to axes and spindles. The filters defined for the spindle will
only be applied when it works as a C axis or it is doing a rigid tapping.
The CNC offers several filters. The "anti-resonance" filter (notch filter) that limits a zone of
the passing band and the low-pass filters that eliminate the banding passing from a particular
frequency on.
One of them is usually used, although both types of filters can also be applied to the same
axis or spindle when the resonance frequency is within the bandwidth of a "low passing" filter.
In order to obtain a good part finish, it is recommended to set all the axes that interpolate
with each other with the same filter type and with the same frequency.
FILTER n
Filter configuration.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Each table has the following machine parameters to configure it.
FILTER
ORDER Filter order.
TYPE Filter type.
FREQUENCY Cut-off or center frequency.
NORBWIDTH Normal bandwidth.
SHARE Percentage of signal going through the filter.
ORDER
Filter order.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values: From 0 to 10 for low passing filter / from 0 to 5 for anti-resonance filter / from 0 to 50
for FAGOR low passing filter.
Default value: 0 (No filter is applied).
Associated variable: (V.)[ch].MPA.ORDER[nb].xn
Parameter included in the FILTER table.
The down ramp is dampened down; the higher the order the greater the drop. A higher order
implies more calculation; therefore, we recommend to consult our Technical support
department before modifying this parameter.
TYPE
Filter type.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values: Low Passing / Anti-resonance (notch filter) / Low passing FAGOR.
Default value: Low Passing.
Associated variable: (V.)[ch].MPA.TYPE[nb].xn
Parameter included in the FILTER table.
Usually, rigid and robust machines have a passing band of up to 30 Hz; i.e. they are capable
of responding up to this frequency. The rest of the machines may have resonance at lower
frequencies (10 Hz or less) that are generated on usual paths.
I n s ta ll a t io n ma n u a l.