Flying Restart With Encoder - Siemens SINAMICS G150 Operating Instructions Manual

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, entering the area around the drive when it is in this condition can cause
death, serious injury, or considerable material damage.
Flying restart without encoder for long cables
In the case of long motor cables, the procedure described above can lead to problems
during a flying restart. In such cases, the following settings can improve the flying restart
function:
● Enter the cable resistance in parameter p0352 before motor data identification.
● Set the parameter p1203 to at least 300%.
Note
To optimize the flying restart, a trace recording should be used to check the function. If
necessary, you can improve the result by making settings for parameters p1202 and p1203.
9.2.6.2

Flying restart with encoder

Description
The flying restart function behaves differently with V/f control and vector control:
● V/f characteristic (p1300 < 20):
● Vector control with encoder:
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
WARNING
With this setting, flying restart takes longer than for values below 300%.
Flying restart without encoder (see "Flying restart without 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
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, entering the area around the drive when it is in this condition can cause
death, serious injury, or considerable material damage.
Functions, Monitoring, and Protective Functions
9.2 Drive Functions
441