Siemens SINAMICS S150 NEMA, Operating Instructions Manual

Page: 533 / 862

Functions, monitoring and protective functions
9.3 Drive functions
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
531
Fast flying restart with voltage acquisition via VSM10
The time for the connection to a rotating induction motor can be shortened when the terminal
voltage of the motor is measured.
Settings for the fast flying restart with voltage acquisition:
1.
Select the voltage measurement for the fast flying restart: p0247.5 = 1.
2. Activate the flying restart: p1200 > 0.
The following status bits indicate the characteristic of the flying restart:
1.
For V/f control: r1204.15
2. For vector control: r1205.18, r1205.19, r1205.20
Note
Voltage amplitude must not be too small
If the measured voltage amplitude undershoots the 1% limit of the converter rated voltage,
the flying restart with voltage measurement is deactivated and the motor speed sought.
9.3.6.2 Flying restart with encoder
Description
The flying restart function behaves differently with V/f control and vector control:
● V/f characteristic (p1300 < 20):
Flying restart without an encoder (see Chapter "Flying restart without an encoder")
● Vector control with a speed encoder:
Since the speed is known from the start, the motor can be magnetized immediately at the
appropriate frequency. The duration of magnetization is specified in p0346. Once the
excitation build-up time has elapsed, the ramp-function generator is set to the actual
speed value and the motor ramped up to the current setpoint speed.
WARNING
Unexpected movement of the motor when flying restart is activated
When the flying restart (p1200) function is active, the drive may still be accelerated by
the search current despite the fact that it is at standstill and the setpoint is 0!
For this reason, death, serious injury, or considerable material damage can occur if
personnel enter the working area of a motor in this state.
•
Observe the general safety instructions.
• Ensure that the EMERGENCY STOP functions are always fully functional.