Siemens SINAMICS G110M Operating Instructions Manual page 77

Function description
Operating the motor in a star connection
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 a 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.
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL
4.3 Electrical Installation
In a star connection, the motor can provide its
rated torque M in the range 0 ... rated fre‐
N
quency f .
N
Rated voltage U = 400 V is available at a rated
N
frequency f = 50 Hz.
N
The motor goes into field weakening above the
rated frequency. In field weakening, the avail‐
able motor torque decreases proportionally
with 1/f. In field weakening, the available pow‐
er remains constant.
In a delta connection, the motor is oper‐
ated with a voltage and frequency above
its rated values. As a consequence, the
motor power is increased by a factor
√3 ≈ 1.73.
In the range f = 0 ... 87 Hz, the motor can
output its rated torque M
The maximum voltage U = 400 V is avail‐
able at a frequency of f = √3 × 50 Hz ≈
87 Hz.
Installation
.
N
.
N
75