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SINAMICS S: Why the pulse Hertz Rate r1801 decreases

Greetings to all!
We use 2 x 6sl3320-1tg41-0aa0 in parallel. It operates an electric motor of 1300 kW. The p1800 parameter is set to 2.5 kHz, but during operation in r1801, 1.66 kHz is displayed. At that time, the motor module does not work with overload, as the description of the parameter p1800 says. Why then the pulse frequency is reduced?

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