ABB ACS880-01 Series, Hardware Manual

Page: 63 / 224

Planning the electrical installation 63
Additional note for sine filters
Sine filters protect the motor insulation system. Therefore, du/dt filter can be replaced
with a sine filter. The peak phase-to-phase voltage with the sine filter is approximately
1.5 ·
U
N
.
Selecting the power cables
„
General rules
Select the input power and motor cables according to local regulations :
• Select a cable capable of carrying the drive nominal current. See section Ratings
(page 137 ) for the rated currents.
• Select a cable rated for at least 70
°
C maximum permissible temperature of
conductor in continuous use. For US, see Additional US requirements, page 68 .
• The inductance and impedance of the PE conductor/cable (grounding wire) must
be rated according to permissible touch voltage appearing under fault conditions
(so that the fault point voltage will not rise excessively when a ground fault
occurs).
• 600 V AC cable is accepted for up to 500 V AC. 750 V AC cable is accepted for
up to 600 V AC. For 690 V AC rated equipment, the rated voltage between the
conductors of the cable should be at least 1 kV.
Use symmetrical shielded motor cable (see page 66 ) for drive frame size R5 and
larger, or motors larger than 30 kW (40 hp). A four-conductor system can be used up
to frame size R4 with up to 30 kW (40 hp) motors, but shielded symmetrical motor
cable is always recommended. Ground motor cable shields 360° at both ends. Keep
the motor cable and its PE pigtail (twisted shield) as short as possible to reduce high-
frequency electromagnetic emissions.
Note: When continuous metal conduit is employed, shielded cable is not required.
The conduit must have bonding at both ends.
A four-conductor system is allowed for input cabling, but shielded symmetrical cable
is recommended.
Compared to a four-conductor system, the use of symmetrical shielded cable reduces
electromagnetic emission of the whole drive system as well as the stress on motor
insulation, bearing currents and wear.
The protective conductor must always have an adequate conductivity. The table
below shows the minimum cross-sectional area related to the phase conductor size
according to IEC 61439-1 when the phase conductor and the protective conductor
are made of the same metal.
ACS880-01 HW.book Page 63 Monday, July 1, 2013 4:51 PM