Planning The Electrical Installation; Checking The Compatibility Of The Motor; Protecting The Motor Winding And Bearings - ABB ACS550-02 User Manual

ACS550-02/U2 User's Manual

Planning the electrical installation

Note: The installation must always be designed and made according to applicable
local laws and regulations. ABB does not assume any liability whatsoever for any
installation which breaches the local laws and/or other regulations. Furthermore, if
the recommendations given by ABB are not followed, the drive may experience
problems that the warranty does not cover.
Note: ACS550-U2 Installation Supplement [3AUA0000004067 (English)] provides
more information about the installation of ACS550-U2 drives.

Checking the compatibility of the motor

1. Select the motor according to the needs of the application.
2. Select the drive according to the rating tables in chapter
Use the DriveSize PC tool if the default load cycles are not applicable.
3. Check that the motor ratings lie within the allowed ranges of the drive control
program:
• motor nominal voltage is 1/2 ... 2 · U
• motor nominal current is 1/6 ... 2 · I
0 ... 2 · I
MOTOR CTRL MODE
4. Consult the motor manufacturer before using a motor in a drive system where the
motor nominal voltage differs from the AC power source voltage.
5. Ensure that the motor insulation system withstands the maximum peak voltage in the
motor terminals. See section
insulation system and drive filtering.
Example 1: When the supply voltage is 440 V, the maximum peak voltage in the
motor terminals can be approximated as follows: 440 V · 1.35 · 2 = 1190 V. Check
that the motor insulation system withstands this voltage.

Protecting the motor winding and bearings

The output of the drive comprises – regardless of output frequency – pulses of
approximately 1.35 times the mains network voltage with a very short rise time. This
is the case with all drives employing modern IGBT inverter technology.
The voltage of the pulses can be almost double at the motor terminals, depending on
the motor cable properties. This in turn can cause additional stress on the motor
insulation.
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in scalar control. The control mode is selected by parameter 9904
2hd
.
Requirements table
Technical data
of the drive
N
of the drive in vector control and
2hd
on page
16
Planning the electrical installation
15
on page 293.
for the required motor