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IS215UCVEM09A Gas turbine module

If synchronous motors are operated with speeds that require a VPM, the star–delta contactors must be protected using a safe power supply so that in case of fault, this contactor remains reliably switched on until the motor has reached uncritical speeds (EMC voltage)! This must be proved in a risk evaluation of the machine/plant constructor!The connection diagram for Y/Δ changeover 611 universal HRS can be engineered, based on the previous examples. For a description of the function, refer to the separate Configuration Manuals and documentation for SIMODRIVE 611 universal.The main contactors must be dimensioned/selected, harmonized and coordinated with the rated motor current and the overload factor. The following table showing the assignment between 1PM4/6 motor/main contactors and auxiliary contactors can be used to provide configuration support:The inductance value of a series reactor or the necessary drive converter pulse frequency can be estimated using the following formula. However, it must be taken into account that when the inverter clock cycle frequency is increased, the module current must be reduced;

Series reactor in the motor lead 

For special motors with a low leakage inductance (where the controller settings are not adequate) it may be necessary to provide a series reactor as 3–arm iron reactor (not a Corovac reactor) and/or increase the inverter clock cycle frequency of the converter. Motors with a low leakage inductance are, from experience, motors that can achieve high stator frequencies (maximum motor stator frequency > 300 Hz) or motors with a high rated current (rated current > 85 A). The voltage rate–of–rise (gradient) of the drive converter has typical values such as: du/dt up to 7 kV/μs For third–party motors where the insulation is unknown or not designed for this voltage rate–of–rise, a series reactor should be used, independent of the selected pulse frequency.

If a motor is changed–over 

from delta to star operation and vice versa, and auxiliary and main contactors are required for each motor. The motor contactors must be mutually interlocked. The changeover is only made when the pulses are inhibited using select terminal signals. When the changeover command is issued, the motor data set is re–loaded and the auxiliary contactors are controlled via the selector relay. Parallel operation of several induction motors, refer to Chapter 8.12.1. The voltage drop across a series reactor depends on the motor current and the motor frequency. If an unregulated infeed is used, the maximum rated motor voltage depends on the line supply voltage available. If these guide values are not observed, then this can have a negative impact on the power (lower power) in the upper speed range.