Siemens SINAMICS G130 Engineering Manual page 137

Note:
The peak values V at the motor specified in the tables apply to switching operations without superimposed effects.
PP
These account for the vast majority of all switching operations. Only when very short pulses occur within the pulse
pattern generated by the inverter which is a very rare event, the peak values V
specified in the tables by up to a maximum of 10 to 15%. Because they are so rare, these short pulses and the higher
peaks values V at the motor which are attributable to them are not relevant to the design of the drive system and
PP
can therefore be ignored during the configuring process.
The peak values V of the phase-to-phase voltage specified in the tables combined with the value T
PP
the voltage edges), which is stated at the beginning of this section, are the basis for selecting the correct motor
insulation. They thus determine whether motors with standard insulation or special insulation are required for
converter-fed operation. This applies irrespective of whether the motors are supplied by Siemens or another
manufacturer.
For further details about Siemens standard and trans-standard motors, please refer to chapter "Motors" and to
catalog D 81.1 SIMOTICS Low-Voltage Motors.
This section of the manual will merely discuss correct selection of the motor insulation of SIMOTICS TN series
N-compact trans-standard motors when combined with SINAMICS converters, because these are the motors which
are most commonly operated on the converters described in this engineering manual and clearly demonstrate the
relationship between motor insulation and converter-fed operation.
Selection of the correct winding insulation for SIMOTICS TN series N-compact trans-standard motors
The table below shows the permissible voltage stress limits for trans-standard N-compact motors of type 1LA8, 1PQ8
and 1LL8 with standard insulation (A) and for trans-standard N-compact motors of type 1LA8, 1PQ8 and 1LL8 with
special insulation for converter-fed operation on line voltages up to 690 V (B).
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
Line supply voltage ≤ 500 V
For drives with SIMOTICS TN series N-compact trans-standard asynchronous motors of type 1LA8 / 1PQ8 / 1LL8
and line supply voltages of ≤ 500 V, motors with standard insulation and a permissible voltage rating of V
are adequate (text in blue boxes).
If we compare the peak values V
Infeeds / Smart Infeeds or Active Infeeds (text in blue boxes), then we see that these values V
irrespective of the reflection factor.
In braking operation with a braking unit, the values V
with line supply voltages of ≤ 500 V (text in blue boxes) only in cases where the reflection factor r < 2 with line
voltages of 460 V, 480 V and 500 V. This applies in the case of G130, G150, S150 and S120 Chassis and Cabinet
Modules due to the drive power rating of > 75 kW (according to diagram: Reflection factor as a function of drive
power rating).
Line supply voltage > 500 V to 690 V
For drives with SIMOTICS TN series N-compact trans-standard asynchronous motors of type 1LA8 / 1PQ8 / 1LL8
and line supply voltages of > 500 V, motors with special insulation and a permissible voltage rating of V
are required (text in yellow boxes).
If we compare the peak values V
Infeeds / Smart Infeeds or Active Infeeds (text in yellow boxes), then we see that these values V
> 1500 V irrespective of the reflection factor.
In braking operation with a braking unit, the values V
insulation of 2250 V with line supply voltages of > 500 V only in cases where the reflection factor is r < 2 with line
voltages of 690 V. This applies in the case of G130, G150, S150 and S120 Chassis and Cabinet Modules due to the
drive power rating of > 75 kW (according to diagram: Reflection factor as a function of drive power rating).
Fundamental Principles and System Description
1)
Line supply voltage
V
Line
≤ 500 V
> 500 V to 690 V
which occur at line supply voltages of ≤ 500 V in the tables for drives with Basic
PP
generally remain below the permissible upper limit of 1500 V
PP
which occur at line supply voltages of > 500 V in the tables for drives with Basic
PP
generally remain below the permissible upper limit for special
PP
SINAMICS Engineering Manual – November 2015
Engineering Information
at the motor can exceed the levels
PP
1)
Phase-to-phase Phase-to-ground
V
PP permissible
1500V
2250 V
PP
Ó Siemens AG
(rise time of
r
1)
V
PE permissible
1100 V
1500 V
= 1500 V
PP
are always ≤ 1500 V
= 2250 V
PP
are always
PP
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