HSP NTG-3000, Operating Instructions Manual

Page: 13 / 18

HSP GmbH Zum Handwerkerhof 2 90530 Wendelstein Tel. 09129 / 2852-0 Fax: 09129 / 2852-11 Web: www.hsshsp.de EMAIL: HSP@hsshsp.de
NTG-3000 Operating Instructions Version 2.11
Page 13 of 18
12.3 Filter parameters of the first and second filter level
The parameters of the first and second filter level must be parameterized over Profibus (see
section “Settings via PROFIBUS” in the description of protocol for data transmission).
12.4 Fixed filter parameters of the third filter level
The fixed parameters of the third filter level will be switched automatically according to the
parameter f
0
(rated frequency). Both sets of parameters for the third filter level are integral
part of the firmware and cannot be parameterized over PROFIBUS.
The third filter level (notch filter) is only activated when the basic frequency is parameterized
with 50 Hz or 60 Hz. In other cases the third filter level will be deactivated (filter input =
filter output).
12.4.1 Parameters at f
0
= 50 Hz, notch filter (third filter level)
b
2
= 0.961738506 b
1
= −1.899795818 b
0
= b
2
a
1
= −1.900784057 a
0
= 0.924465250
12.4.2 Parameters at f
0
= 60 Hz, notch filter (third filter level)
b2 = 0.9543227349 b
1
= −1.8748381111 b
0
= b
2
a
1
= −1.8762498820 a
0
= 0.9100572407