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User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 38 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
The notch filters can be configured using the following parameters:
Parameter
Notes
Notch frequency 1
ID 0x08000100
Frequency f
0
of notch filter 1 and notch filter 2, in Hz.
The maximum value is:
f
0max
= 0.45*f
sample
where f
sample
is the servo rate in Hz (1/
Servo Update Time
(ID
0x0e000200))
Adjusting the notch filter frequency can be useful, particularly in the
case of very high loads. For further details, see “Adjusting the Notch
Filter(s) in Open-Loop Operation” (p. 136).
Notch frequency 2
ID 0x08000101
Notch Rejection 1
ID 0x08000200
Notch rejection value r for notch filter 1 and notch filter 2.
0 to 0.98
Recommended value is 0.05. A notch rejection value of 1 deactivates
the notch filter.
The notch rejection value determines the filter width of the notch
filter, i.e. it scales the damping done by the notch filter: The greater
the rejection value, the wider the frequency spectrum of the damping,
but the smaller the damping effect.
Notch Rejection 2
ID 0x08000201
Notch Bandwidth 1
ID 0x08000300
Bandwidth k of notch filter 1 and notch filter 2
≥
0.1
The notch filter bandwidth determines the effect of the low-pass
filtering: The smaller the bandwidth, the smaller the low-pass filter
frequency.
Notch Bandwidth 2
ID 0x08000301
Creep factor T1/sec
ID 0x08000400
Currently not used; provided for future applications.
Creep factor T2/sec
ID 0x08000401
Enable Notch in Open
Loop
ID 0x08000500
Enables usage of notch filter in open-loop operation. In closed-loop
operation, the notch filters are always enabled.
0 = disable notch filter in open-loop operation (default)
1 = enable notch filter in open-loop operation
Notch Filter
Calculation Method
ID 0x08000600
0 = bilinear
1 = zero-order hold
2 = frb (rejection rate is independent of bandwith)