50 Electrical installation
Motor and motor cable
Check the insulation of the motor and motor cable as follows:
1. Check that the motor cable is connected to the motor and disconnected from the
drive output terminals U2, V2 and W2.
2. Measure the insulation resistance between each phase
conductor and the Protective Earth conductor using a
measuring voltage of 500 V DC. The insulation resistance
of an ABB motor must exceed 100 Mohm (reference value
at 25 °C or 77 °F). For the insulation resistance of other
motors, please consult the manufacturer’s instructions.
Note:
Moisture inside the motor casing will reduce the insulation resistance. If
moisture is suspected, dry the motor and repeat the measurement.
Checking the compatibility with IT (ungrounded) and
corner-grounded TN systems
WARNING!
Disconnect the internal EMC filter when installing the drive on an
IT system (an ungrounded power system or a high-resistance-grounded [over
30 ohms] power system), otherwise the system will be connected to ground potential
through the EMC filter capacitors. This may cause danger or damage the drive.
Disconnect the internal EMC filter when installing the drive on a corner-grounded TN
system, otherwise the drive will be damaged
Note:
When the internal EMC filter is disconnected, the drive is not EMC compatible
without an external filter.
1. If you have an IT (ungrounded) or corner-grounded TN system, disconnect the
internal EMC filter by removing the EMC screw. For 3-phase U-type drives (with
type designation ACS355-03U-), the EMC screw is already removed at the factory
and replaced by a plastic one.
ohm
U1
3~
M
V1
W1
PE
1
VAR
EMC
1
EMC
EMC screw in R0…R2.
In R3, the screw is a little further up.
EMC screw in R4, IP20
(behind cover in R4, NEMA 1)
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...