34 Chapter 5 - Electrical Connections
User Manual
5.8. Braking
DVS drives provide DC braking as a standard function. The DC braking function applies a DC current to two of the motor
phases to generate braking torque. The machines kinetic energy is dissipated inside the motor in the form of heat.
The DC braking function cannot provide intermediate braking [e.g. rapid braking from 1400 to 1200 rpm],
but only braking to zero speed from already low speeds. If required, braking current can be measured
from phase U.
M
3 ~
M
3 ~
Energy
Machine
Energy
U
DC
-
+
Inverter
U V
W
/2
Figure 5.8.7: Principle of functioning of DC braking
5.9. Safety delay before work on the drive
After disconnecting a DVS drive from the mains supply, always respect a minimum delay of 60 seconds before starting any
work on its internal parts.
