ABB ACS880-87LC-4000A/4021A-7, Hardware Manual

Page: 68 / 144

68 Electrical installation

Grid cable
Check the insulation of the grid cable according to local regulations before connecting it to
the converter.

Generator stator and generator cable
Check the insulation of the generator stator and cable as follows:
•
Check that all cables are disconnected from the converter output terminals U2, V2 and
W2.
•
Measure the insulation resistance between each phase conductor and the protective
ground conductor using a measuring voltage of 1000 V DC. The insulation resistance
of an ABB generator must exceed 100 Mohm (reference value at 25 °C or 77 °F). For
the insulation resistance of other generators, please consult the manufacturer’s
instructions.
•
Note: Make sure that there is no condensed moisture inside the generator casing. If
you suspect that there is moisture, dry the generator before measurement.
•
Note: When using permanent magnet generator, it must be stable at the time of the
measurement.

Integrated DC chopper and DC resistor (D150+D151)
Every converter equipped with integrated DC chopper and DC resistor is tested for
insulation between the main circuit and the chassis at the factory (2700 V rms 50 Hz for
1 second). Do not make any voltage tolerance or insulation resistance tests.
Connecting the grid cables/busbars

Connection diagram
ohm
G
3~
U1
V1
W1 PE
U<
PE
L1
L2
L3
PE