Programming
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page
D-161
8
9
10
A
B
C
D
E
1
2
3
4
5
6
7
PHASE ADVANCE
This selection implements a transfer function of the type 1 + s / 2*pi*f1
, which gives a phase
1 + s / 2*pi*f2
advance between the frequencies f1 to f2. When this function is selected, the values of f1 and f2 are set by the parameters
COMPENSATION F1 and COMPENSATION F2.
NOTCH FILTER
This selection will give a zero transmission notch at a frequency specified by parameter COMPENSATION F1. It has a
phase delay of 1 sample period. A sample period is 1/(2 * switching frequency). For example, if the switching frequency is
4kHz, a sample period is 125us.
Summary
“COMPENSAT’N
TYPE” Selection
Compensation Type
Action of
“COMPENSATION F1”
Action of
COMPENSATION F2”
NONE
Torque demand is transmitted
unchanged.
- -
MAX ATTENTUATION
First order filter with zero
transmission at Nyquist limit.
sets 3db cutoff frequency has no effect
MINIMUM PHASE
First order recursive filter with
minimum phase shift.
sets 3db cutoff frequency has no effect
PHASE ADVANCE Phase advance function.
Sets value of f1 (beginning
of phase advance).
Sets value of f2 (end of phase
advance).
NOTCH FILTER
Zero transmission notch at
selected frequency.
Sets frequency of zero
transmission notch.
has no effect
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