Replacement Of Simovert P And Simovert A Converter Ranges By Sinamics; General; Replacement Of Converters In Simovert P 6Se35/36 And 6Sc36/37 Ranges By Sinamics - Siemens SINAMICS G130 Engineering Manual

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Replacement of SIMOVERT P and SIMOVERT A converter ranges by SINAMICS

General

The converters of the SIMOVERT P and SIMOVERT A ranges that were in production up till about 1995 are reaching
the end of their life cycle and the spare parts supply is becoming increasingly problematic. As a result, more and
more of them are being replaced by the new SINAMICS converters.
However, the series 1LA6 and 1LA1 motors fed by the converters are often not replaced at the same time.
In contrast to the older range of converters, the SINAMICS converters are equipped with modern, fast-switching
IGBTs in the motor-side inverter. The consequences for the older 1LA6 and 1LA1 motors driven by these new
converters are
•
higher voltage stress on the motor winding,
•
higher bearing currents in the motor bearings.
When SINAMICS converters are combined with old motors of the 1LA6 or 1LA1 range, therefore, a number of points
need to be considered if the motors are to be protected against damage in operation on SINAMICS units.

Replacement of converters in SIMOVERT P 6SE35/36 and 6SC36/37 ranges by SINAMICS

Properties of the SIMOVERT P converter
Like the new SINAMICS units, SINAMICS P converters are PWM converters with a voltage-source DC link. The
motor-side inverter on models of type 6SE35/36 for line supply voltages of ≤ 500 V is equipped with transistors and of
type 6SC36/37 for line supply voltages of 600 V to 690 V with GTOs (Gate Turn-Off Thyristors).
Drive with SIMOVERT P 6SE35/36 or 6SC36/37 voltage-source DC link converter
The voltage rate of rise and the pulse frequencies for SIMOVERT P converters are relatively low.
•
Transistorized frequency converter 6SE35/36:
•
GTO converter 6SC36/37:
The voltage stress on the motor winding and the bearing currents in the motor bearings are therefore significantly
lower in drives with a SIMOVERT P converter than in systems operating on a SINAMICS converter with IGBTs in the
inverter.
Properties of 1LA6 and 1LA1 motors operating on SIMOVERT P converters
•
The motors feature high-leakage rotor designs (special model for SIMOVERT P: With frame size 315L
and higher on 1LA6 motors and generally on 1LA1 motors).
•
The insulation system on 1LA6 motors is comparable to the standard insulation on modern motors, while
the insulation system on 1LA1 motors is comparable to the special insulation on modern motors designed
for converter-fed operation at 690 V (see chapter "Motors").
•
1LA6 motors have no insulated bearing at the non-drive end. Due to their bigger frame size, 1LA1 motors
do have an insulated bearing at the non-drive end.
General Engineering Information for SINAMICS
dv/dt = 1 kV/μs to 3 kV/μs,
dv/dt ≈ 200 V/μs,
SINAMICS Engineering Manual - May 2008
Engineering Information
Pulse frequency f = 1 kHz
P
Pulse frequency f = 500 Hz
P
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