Flying Restart - Siemens SINAMICS S120 Function Manual

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Vector control

6.17 Flying restart

Flying restart

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.

After power ON, the "flying restart" function automatically connects a Motor Module to a motor

which may already be turning. This function can be activated during operation with/without

To start the "Flying restart" function, proceed as follows:

1. The function should be activated via p1200 especially for loads which may coast after power

interruption.

This prevents sudden loads in the entire mechanics.

2. With an induction motor, the system waits for a demagnetization time to elapse before the

search is carried out.

De-magnetizing time

● The demagnetization time can reduce the voltage at the motor terminals. At the pulse

● An internal demagnetization time is calculated. In addition, you can define a de-

● In operation without an encoder, a search is carried out initially for the current speed. The

● When operated with an encoder (actual speed value is sensed), the search phase is

enable, this avoids high equalizing currents due to a phase short-circuit.

excitation time via parameter p0347. The system waits for the longer of the two times to

search starts at the maximum speed plus 25%. A Voltage Sensing Module (VSM) is

required for permanent-magnet synchronous motors (for additional information, see

SINAMICS S120 Control Units Manual and SINAMICS S120/S150 List Manual in

parameter p1200).

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

Drive functions