Flying Restart For A Synchronous Reluctance Motor - Siemens SINAMICS S120 Function Manual

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6.17 Flying restart

If the measured voltage amplitude undershoots the 1% limit of the converter rated voltage, the

flying restart with voltage measurement is deactivated and the rotating frequency sought.

Flying restart for a synchronous reluctance motor

Function description

Unplanned movement of the motor when flying restart is activated

When the "flying restart" (p1200) is activated, the drive can still be accelerated by the search

current despite the fact that it is at standstill and the setpoint is "0"; this can result in death,

severe injury or material damage.

● Ensure that nobody is in the danger zone and that the mechanical parts can move freely.

With encoderless operation of a synchronous reluctance motor, using the "Flying restart"

function, the position and speed of the rotor can be determined with almost no delay. To

increase the quality of the function, a motor data identification routine (p1900, stationary

measurement) must be carried out. The motor properties are measured so that the flying restart

function can optimally determine the speed and the position.

Proceed as follows to configure the function:

1. Activate the "Flying restart" function using p1200 = 1 especially for loads which may coast

down after the power is interrupted.

This prevents sudden loads in the entire mechanics.

2. Contrary to an induction motor, for a synchronous reluctance motor, the system does not

wait a specific demagnetization time (see. "Flying restart for an induction motor

(Page 266)"). Flying restart can be activated for the rotating machine immediately after

switching off.

3. For a synchronous reluctance motor, immediately after the speed has been determined,

magnetization starts (p0346).

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

Drive functions