SIEMENS
6/7
Siemens MD 50.8 · 2017
Motor options
Electrical design
Windings and insulation
6
■
Inverter operation
All motors used in SIMOGEAR geared motors are equipped with
innovative insulation systems, consisting of high-quality enamel
wires and insulating sheet materials in conjunction with highly
temperature-resistant impregnations.
The motors can be operated with SINAMICS G and SINAMICS S
converters and inverters (controlled and uncontrolled infeed)
provided that the permissible voltage peaks listed in the relevant
table are not exceeded.
Continuous operation while utilizing the admissible voltage toler-
ances must be avoided and is not recommended according to
IEC 60034-1 2011 Chapter 7.3.
Preferred supply system configurations are TT systems and
TN systems with neutral-point grounding. In the case of a fault
when connected to an IT supply system (ground fault), the insu-
lation is excessively stressed. In this case, the process should
be terminated as quickly as possible (t < 2 h), and the fault
resolved. We do not recommend operation on TN supply
systems with transition-point grounding.
Note:
When motors are operated on SINAMICS inverters additional
losses occur which, depending on the admissible winding over-
temperature, can make it necessary to reduce the torque. The
admissible torque values can be obtained from the SIZER
engineering tool. The lowest frequency specified there is 5 Hz.
For stationary inverter operation at lower frequencies, particu-
larly in the case of frame sizes < 100, it is necessary to inquire at
the Quotation Center.
For inverter operation with the outputs specified in the catalog, the
motors are utilized according to temperature class 155 (F), i.e. in
this case neither a service factor > 1 nor an increased coolant
temperature is possible.
■
Impulse Voltage Insulation Class (IVIC) – category C (strong)
The insulation system of the motors meets the requirements of
EN 60034-18-41:2014 according to the stress category C
(strong).
The insulation systems of the motors are optimized for operation
on SINAMICS inverters. The admissible voltage peaks specified
in the table must not be exceeded.
Thanks to the high-quality insulation systems, the requirements
of IVIC C are significantly exceeded; see the comparison in the
table. This also means that significantly more stringent require-
ments can be met by the system operator.
The table below shows a comparison between the maximum ad-
missible peak-peak voltage at the motor terminal as stipulated
by EN 60034-18-41 and the peak-peak voltage tolerance of
SIMOTICS insulation systems.
The following applies for the voltage rise time:
T
a
> 0.3 ± 0.2 μs
The voltages specified are peak-peak values (Vpk/pk).
■
Example of how to design a drive system for a line voltage of 400 V in compliance with the specifications for the motor
and inverter
When SIMOGEAR geared motors are operated on SINAMICS
inverters, reflections may cause voltage peaks in excess of the
upper tolerance limits. These effects may also be influenced by
the design and length of the cables used.
A = standard power cable (NYCWY)
B = power cable with symmetrical shield (e.g. Protoflex)
In the example below, various motor configurations are
assessed on the basis of the following general conditions:
•
Configuration with a single motor:
Each motor has its own Motor Module with a separate infeed
for each module
•
Configuration with multiple motors:
Each motor has its own Motor Module; these modules are
interconnected via a common DC link which is supplied by an
Active Line Module combined with an Active Interface Module
(AIM).
•
TN system
U
k
= 5 %
•
U
DC Link
= 1.5 x
U
Line
with a
modulation depth ALM
max
< 0.97 and
U
DC,max
•
Motor Modules in booksize format
•
Active Line Module (ALM) with matching Active Interface
Module (AIM)
•
No parallel connection of Active Line Modules
•
Pulse frequencies set to factory defaults
On this basis, the maximum recommended cable lengths [m]
are:
Provided that the cables do not exceed the recommended
lengths and on the basis of the specified general conditions, it
can be assumed that the system will operate in compliance with
the product specifications.
Other lengths of cable may be used, but the potential voltage
peaks and front times must be checked separately according to
the table for compliance with the product specifications.
Line voltage
U
rated
400 V
480 V
Standard
IVIC C
Siemens
IVIC C
Siemens
Û
phase-ground
1 680
2 200
2 016
2 200
Û
phase-phase
2 360
3 000
2 832
3 000
Rated
power
kW
Rated voltage
U
Line
= 400 V ± 10 %
(DC link voltage
U
DC Link
= 640 V
DC
)
Multi-motor operation
Single-motor operation
Cable type A
Cable type B
Cable type A
Cable type B
0.09 ... 4
50
1)
50
1)
50
1)
50
1)
5.5 ... 7.5
55
70
1)
70
1)
70
1)
11 ... 18.5
50
75
100
1)
100
1)
22 ... 45
100
1)
100
1)
55 ... 90
85
1)
Cable length limitation by SINAMICS Motor Module
© Siemens AG 2017