Flying Restart For A Synchronous Reluctance Motor - Siemens SINAMICS S120 Function Manual
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5.17.2
Flying restart for a synchronous reluctance motor
With encoderless control 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.
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 hazardous zone - and that the mechanical system can
Sequence
1. Activate the "Flying restart" function using p1200 = 1 especially for loads which may coast
down after the power is interrupted.
This avoids the complete mechanical system from being subject to sudden loads.
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 271)"). 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).
4. The actual speed setpoint is then set in the ramp-function generator to the speed actual
value.
Ramp-up (acceleration) to the final speed setpoint starts from this value.
Bit r1205.21 indicates whether flying restart is active.
5. The search current and the search speed can be set using parameters p1202 and p1203
to optimize the flying restart.
Note
If the search current is changed (p1202), then a stationary measurement must be carried
out to accept the change. After changing the parameter, the measurement is configured
(p1909.22 = 1) so that it is as short as possible. The bit is only reset if a motor data
identification routine has been carried out.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
WARNING
freely move.
Vector control
5.17 Flying restart
275
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