6 Specifications
6.12 All-pole sine filter
DA1 Variable Frequency Drives
08/18 MN04020005Z-EN
www.eaton.com
193
6.12 All-pole sine filter
All-pole sine filters make it possible to reduce differential-mode and
common-mode interference at the variable frequency drive output when
using extremely long motor cable lengths. This makes it possible to eliminate
the bearing currents, caused by common-mode voltage, between the motor
windings’ neutral point and earth potential, extending the motor’s lifespan.
DX-SIN3-…-A all-pole sine filters also require being connected to DC+ (or +)
and DC- (or -) on the internal DC link in DA1 variable frequency drives.
They can be used
•
for
fi
xed switching frequencies
≧
8 kHz (P2-24, double modulation),
•
Output voltage U
2max
to 500 V,
•
Rotating field frequencies (f
2
) of 0 to 60 Hz.
They make it possible to forego the use of screened motor cables.
￫
Please inquire for DX-SIN3-…-A all-pole sine filters for motor
currents of up to 180 A.
￫
DX-SIN3-…-A all-pole sine filters may be operated only with
fixed switching frequencies.
Accordingly, the switching frequency (P2-24) must be set to the
value set in parameter P6-02 (auto temperature management)
(P2-24 = P6-02).
Permissible switching frequencies for DA1 with DX-SIN3…:
1
≙
8 kHz; 2
≙
12 kHz
For the DA1 variable frequency drive, the set value with the
double-modulation procedure is the double value of the
effective value in the sine filter (1
≙
8 kHz
→
4 kHz;
2
≙
12 kHz
→
6 kHz).
