Siemens SINAMICS G220 - Star Connection of the Motor or 87 Hz Delta Connection

4.12 Star connection of the motor or 87Hz delta connection
Overview
In the case of a 400‑V power supply, the motor can be operated on the converter in either a star
or a delta connection.
In a star connection, the motor is operated with its rated values.
In a delta connection, the motor is operated with a voltage and frequency above its rated
values.
Description of function
Star connection
I
I
1
8
8
1
I
0
0
1
I
3
3
1
9
+]
9
8
8
:
8
8
9
9
:
:
Figure4-4 Motor in star connection
In a star connection, the motor can be loaded with its rated torque M
N
in the range 0…rated
frequencyf
N
.
The rated voltageU
N
= 400V is available at the rated frequencyf
N
=50Hz.
The motor goes into 󹪝eld weakening above the rated frequency. In 󹪝eld weakening, the
available motor torque decreases proportionally with 1/f. In 󹪝eld weakening, the available
power remains constant.
Delta connection
I
I
1
෭෪I
1
8
8
1
෭෪8
1
෭෪3
1
9
9
+]+]
I
0
0
1
I
3
3
1
9
8
8
:
8
8
9
9
:
:
Figure4-5 Motor in delta connection with 87Hz characteristic
Application planning
4.12Star connection of the motor or 87Hz delta connection
SINAMICS G220 converter
76 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB