Permanent-Magnet Synchronous Motors - Siemens SINAMICS S120 Function Manual

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Active loads

Active loads that can be used to reverse the drive, e.g., hoisting gear, must be started in the

open-loop speed control mode. In this case, bit p1750.6 must be set to 0 (open-loop controlled

operation when the motor is blocked). The static (steady state) torque setpoint p1610 must be

greater than the maximum occurring load torque.

Loads that can drive the motor

For applications with high regenerative load torques at low speeds, p1750.7 can also be set to

1. As a result, the speed changeover limits of the motor model are increased and a faster

changeover can be made into open-loop controlled operation.

Permanent-magnet synchronous motors

Permanent-magnet synchronous motors (PMSM) are always started and reversed in the open-

loop controlled mode. The changeover speeds are set to 10% as well as 5% of the rated motor

speed. Changeover is not subject to any time condition (p1758 is not evaluated). Prevailing

load torques (motor or regenerative) are adapted in open-loop operation, facilitating constant-

torque crossover to closed-loop operation even under high static loads. Whenever the pulses

are enabled, the rotor position is identified.

Closed-loop controlled operation down to f = 0 Hz

The actual rotor position can be continuously determined down to 0 Hz (standstill). With

Siemens 1FW4 and 1PH8 torque motors, the load can be maintained at standstill or, from

standstill, the motor can accelerate any load up to rated torque.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Zero point and starting in the open-loop controlled mode at low speeds

6.2 Vector control without encoder (SLVC)

Vector control