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74 Guidelines for planning the electrical installation
For connecting to power networks with a short rating from 65 kA up to 100 kA, the drive can
be ordered with option +F274, which adds an additional 100 kA rated input cubicle to the
input section of the drive.
Examining the compatibility of the motor and drive
Use asynchronous AC induction motors, permanent magnet synchronous motors, AC
induction servomotors or ABB synchronous reluctance motors (SynRM motors) with the
drive.
Select the motor size and drive type from the rating table on basis of the AC line voltage
and motor load. You can find the rating table in the appropriate hardware manual. You can
also use the DriveSize PC tool.
Make sure that the motor can be used with an AC drive. See
For basics of protecting the motor insulation and bearings in drive systems, see
the motor insulation and bearings (page
Note:
•
Consult the motor manufacturer before using a motor with nominal voltage that differs
from the AC line voltage connected to the drive input.
•
The voltage peaks at the motor terminals are relative to the supply voltage of the drive,
not to the drive output voltage.
Protecting the motor insulation and bearings
￭
The drive employs modern IGBT inverter technology. Regardless of frequency, the drive
output comprises pulses of approximately the drive DC bus voltage with a very short rise
time. The pulse voltage can almost double at the motor terminals, depending on the
attenuation and reflection properties of the motor cable and the terminals. This can cause
additional stress on the motor and motor cable insulation.
Modern variable speed drives with their fast rising voltage pulses and high switching
frequencies can generate current pulses that flow through the motor bearings. This can
gradually erode the bearing races and rolling elements.
du/dt filters protect motor insulation system and reduce bearing currents. Common mode
filters mainly reduce bearing currents. Insulated N-end (non-drive end) bearings protect the
motor bearings.
Requirements table
￭
These tables show how to select the motor insulation system and when a drive du/dt and
common mode filters and insulated N-end (non-drive end) motor bearings are required.
Ignoring the requirements or improper installation may shorten motor life or damage the
motor bearings and voids the warranty.
Requirements table (page
74).
74).
Protecting
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