Siemens SINAMICS G115D User Manual

Function description
Operating the motor in a star connection
I
I
1
8
8
1
I
0
0
1
I
3
3
1
9
+]
9
8
8
:
In a star connection, the motor can provide its
rated torque M
N
in the range 0…rated fre‐
quencyf
N
.
Rated voltage U
N
= 400 V is available at a rated
frequencyf
N
=50Hz.
The motor goes into 󹪝eld weakening above the
rated frequency. In 󹪝eld weakening, the avail‐
able motor torque decreases linearly with 1/f.
In 󹪝eld weakening, the available power re‐
mains constant.
Operating the motor in a delta connection with 87Hz characteristic
9
8
8
:
I
I
1
8
I
0
0
1
I
3
9
9
+]
+]
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 ≈1.73.
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.
The motor only goes into 󹪝eld 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 signi󹪝cantly than when operated with f≤50Hz.
• The motor must have windings that are approved for a voltage> rated voltage U
N
.
• As the fan impeller rotates faster, the motor has a higher noise level than operation with
f≤50Hz.
Wiring
5.10Connecting the motor
SINAMICS G115D Wall Mounted distributed drive
76 Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA

Siemens SINAMICS G115D Specifications

General

Brand	Siemens
Model	SINAMICS G115D
Category	DC Drives
Language	English