36 Planning the electrical installation
Motor selection and compatibility
1. Select the motor according to the rating tables in
Technical data
(page 105). Use
the DriveSize PC tool if the default load cycles are not applicable.
2. Make sure that the motor ratings are in the allowed ranges of the drive control
program:
• motor nominal voltage is 1/2 ... 2 ·
U
N
of the drive
• motor nominal current is 1/6 ... 2 ·
I
2hd
of the drive in DTC control and
0 ... 2 ·
I
2hd
in scalar control. The control mode is selected by a drive
parameter.
3. Make sure that the motor voltage rating meets the application requirements:
See Note 7 below the
Requirements table
(page 38)
.
4. Consult the motor manufacturer before you use a motor in a drive system in
which the motor nominal voltage differs from the AC power source voltage.
5. Make sure that the motor insulation system withstands the maximum peak
voltage in the motor terminals. See the
Requirements table
(page 38) for the
required motor insulation system and drive filtering.
Example: When the supply voltage is 440 V and a drive with a diode supply is
operating in motor mode only, 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.
Resistor braking Motor voltage rating
no resistor braking is in use
U
N
frequent or long term brake cycles will be used
U
ACeq1
U
N
= rated input voltage of the drive
U
ACeq1
=
U
DC
/1.35
U
ACeq1
= the equivalent AC power source voltage of the drive in V AC.
U
DC
= the maximum DC link voltage of the drive in V DC.
For resistor braking:
U
DC
= 1.21 × nominal DC link voltage.
Note: Nominal DC link voltage is
U
N
× 1.35 in V DC.
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