Configuring The Star/Delta Connection Of The Wall-Mounted Converter - Siemens SINAMICS G115D Operating Instructions Manual

Operating the motor in a delta connection with 87 Hz characteristic
The motor only goes into field weakening above 87 Hz.
The higher motor power when operated with an 87 Hz characteristic has the following
disadvantages:
• The converter must supply approximately 1.73x current. Select an converter based on its
rated current - and not its rated power.
• The motor temperature increases more significantly than when operated with f ≤ 50 Hz.
• The motor must have windings that are approved for a voltage > rated voltage U
• As the fan impeller rotates faster, the motor has a higher noise level than operation with
f ≤ 50 Hz.
4.10.2.2

Configuring the star/delta connection of the wall-mounted converter

The star/delta connection is implemented inside the terminal box of the motor. You can
configure the connection according to the circuit diagram of the motor.
Star connection
SINAMICS G115D distributed drive
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
4.10 Connecting the motor
In a delta connection, the motor is operated
with a voltage and frequency above its rated
values. As a consequence, the motor power is
increased by a factor
In the range f = 0 ... 87 Hz, the motor can out-
put its rated torque M .
N
The maximum voltage U = 400 V is available at
a frequency of f = × 50 Hz ≈ 87 Hz.
Delta connection
Wiring
≈ 1.73.
.
N
67