Special Insulation For Higher Line Supply Voltages At Converter-Fed Operation - Siemens SINAMICS G130 Engineering Manual

Motors
Engineering Information
11.8

Special insulation for higher line supply voltages at converter-fed operation

For information about Siemens standard motor ranges, please refer to catalog D 81.1 SIMOTICS Low-Voltage
Motors.
SIMOTICS TN series N-compact 1LA8 / 1PQ8 / 1LL8 trans-standard motors are equipped with standard insulation
which is designed to allow them to operate without restrictions on SINAMICS converters at line supply voltages of up
to 500 V. For operation at higher line supply voltages, motors with higher insulation strength must be selected, or
filters such as dv/dt or sine-wave filters must be provided at the converter output.
SIMOTICS TN series N-compact 1LA8 / 1PQ8 / 1LL8 trans-standard motors are available with special insulation for
converter-fed operation at line supply voltages of > 500 V to 690 V. They do not require filters to be installed at the
converter output. These motors are identified by an "M" in the 10th position of the order number, e.g. 1LA8315-
2PM80.
The converter-optimized motors from the SIMOTICS FD range are equipped as standard with insulation that has
been specially designed for converter-fed motors. For drives operating on low line voltages up to 500 V, this
insulation is the same as the standard insulation used in SIMOTICS TN series N-compact motors, and for operation
on higher line voltages of > 500 V, it is the same as the special insulation installed in SIMOTICS TN series
N-compact motors.
SIMOTICS TN series H-compact 1LA4 and 1PQ4 trans-standard motors and SIMOTICS TN series H-compact PLUS
trans-standard motors are intended exclusively for converter-fed operation and are thus provided as standard with
special insulation for converter-fed operation on line voltages up to 690 V.
SIMOTICS M series 1PL6, 1PH7 and 1PH8 compact asynchronous motors in frame size 280 or larger are also
available with special insulation for converter-fed operation on line voltages up to 690 V.
SIMOTICS HT series HT-direct 1FW4 synchronous motors can only be fed by converters and are thus equipped as
standard with special insulation for converter-fed operation on line voltages up to 690 V.
The table below shows the permissible voltage stress limits for SIMOTICS TN series N-compact 1LA8, 1PQ8 and
1LL8 trans-standard motors with standard insulation (A) and for SIMOTICS TN series N-compact 1LA8, 1PQ8 and
1LL8 trans-standard motors with special insulation for converter-fed operation on line voltages up to 690 V (B).
The ratio between insulating material and copper inside the slots is less favorable with special insulation than with
standard insulation, resulting in a slight reduction in the rated output power of motors with special insulation.
Winding insulation
A = standard insulation
B = special insulation
1)
Valid for SIMOTICS TN series N-compact trans-standard motors 1LA8 / 1PQ8 / 1LL8
Permissible voltage limits for SIMOTICS TN series N-compact trans-standard motors
Permissible voltage limits V
A = standard insulation
B = special insulation
SINAMICS Engineering Manual – November 2015
526/528
Ó Siemens AG
Line supply voltage
V
Line
≤ 500 V
> 500 V to 690 V
for SIMOTICS TN series N-compact trans-standard motors
PP
1)
Phase-to-phase
V
PP permissible
1500 V
2250 V
1)
Phase-to-ground
V
PE permissible
1100 V
1500 V
1)