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

General Engineering Information for SINAMICS
Engineering Information

3.8 Replacement of SIMOVERT P and SIMOVERT A converter ranges by SINAMICS

3.8.1

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, motors from the 1LA6, 1LA8 and 1LA1 ranges which are fed by these SIMOVERT P and SIMOVERT A
converters are in many cases not replaced at the same time as the converters.
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, 1LA8 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, 1LA8 or 1LA1 ranges, therefore, a number of
points need to be considered if the motors are to be protected against damage in operation on SINAMICS units.
3.8.2

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, 1LA8 and 1LA1 motors operating on SIMOVERT P converters
·
The motors feature either standard rotor design or special high-leakage rotor design for SIMOVERT P:
These special rotors are found on 1LA6 motors of frame sizes 315L or higher, on 1LA8 motors designated
with the letters "PS" in the order number, and on 1LA1 motors in general.
·
The insulation system on 1LA6 motors is comparable to the standard insulation on modern motors. This
also applies to 1LA8 motors as these were not equipped with special insulation for converter-fed operation
at 690 V until the SIMOVERT Masterdrives product range was launched. The insulation system on 1LA1
motors is comparable to the modern special insulation for converter-fed operation at 690 V (see chapter
"Motors").
·
Motors in the 1LA6 range are not fitted with an insulated bearing at the NDE (non-drive end). This also
applies in general to motors in the 1LA8 series as they were not equipped with insulated NDE bearings for
converter-fed operation until the the SIMOVERT Masterdrives product range was launched. Due to their
higher frame sizes motors in the 1LA1 range are fitted with an insulated bearing at the NDE.
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Ó Siemens AG
dv/dt = 1 kV/ms to 3 kV/ms,
dv/dt ≈ 200 V/ms,
Pulse frequency f = 1 kHz
P
Pulse frequency f = 500 Hz
P