Flying Restart - Siemens SINAMICS S120 Function Manual

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Vector control

4.20 Flying restart

Flying restart

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 or

without an encoder.

Sequence for the normal flying restart

1. The "Flying restart" function should be activated via p1200 especially for loads which may

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

3. For an induction motor, immediately after the speed has been determined, magnetization

4. The current speed setpoint in the ramp-function generator is then set to the current actual

Dangerous acceleration of the motor with activated flying restart

When the flying restart (p1200) function is active, the drive may still be accelerated by the

detection current despite the fact that it is at standstill and the setpoint is 0!

For this reason, death or serious injury can occur if personnel enter the working area of

motors in this condition.

Do not enter the working area of the motors.

coast after power interruption.

This prevents sudden loads in the entire mechanics.

search is carried out. The demagnetization time can reduce the voltage at the motor

terminals. At the pulse enable, this avoids high equalizing currents due to a phase short-

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

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

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

The 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).

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

starts (p0346).

speed value.

The ramp-up to the final speed setpoint starts with this value.

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

Drive functions