Vector control
5.22 Bypass
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
285
A reactor is used to de-couple the drive converter from the line supply - the uk value for the
reactor is 10% +/- 2%.
Figure 5-26 Circuit example: Bypass with synchronization with overlap
Note
As a result of the overlap, when synchronizing back to the converter, the DC link voltage can
increase; in the worst case scenario this can result in a fault trip. It is possible to activate an
overvoltage protectio
n function, which, when a Vdc max threshold r1242 is reached, the
pulses are inhibited; as a consequence, the DC link voltage stops increasing. When the
pulses are inhibited, the motor coasts down, which is why it must be restarted on
-the-fly. As
ence, overvoltage protection is only active if the "Flying restart" function was
= 1).
The bypass function with synchronization with overlap (p1260 = 1) can only be activated
using a control signal. Activation using a speed threshold is not possible.
To Next Page
Loading...
