Description of function
In the following circumstances, the motor cannot accelerate to its speed setpoint after starting:
• Load moment of inertia is too high
• Load torque is too large
• Ramp-up time p1120 is too short
To improve the startup behavior of the motor, the converter boosts the voltage at low speeds.
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Figure14-81 Voltage boost
At p1610 = 0%, the motor starts with the current for an unloaded motor.
At p1610 = 100%, the motor starts with a current corresponding to the rated torque.
During acceleration and deceleration, the converter adds p1611 to p1610 and converts the
resulting total torque into a current setpoint.
Parameters
The following list contains the parameters of the "Optimize motor startup for Standard Drive
Control operating mode" function.
Number Name Unit
r0071 Maximum output voltage [Vrms]
p0310[0...n] Rated motor frequency [Hz]
p0320[0...n] Motor rated magnetizing current/short-circuit current [Arms]
p1401[0...n].0...30 Flux control conguration
p1610[0...n] Starting torque static (without encoder) [%]
p1611[0...n] Acceleration starting torque (encoderless) [%]
p1616[0...n] Current setpoint smoothing time [ms]
r1751.0...22 Motor model status
Functions
14.10Closed-loop drive control
SINAMICS G220 converter
468 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
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