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User’s manual
At the return of the mains, it will need to wait for the time of soft start for the gradual recharging of
capacitors for the motor to be able to resume.
2.3.1.2.4 EMERGENCY BRAKE (C34=3)
This particular control is adapted to those applications in which the machine may be stopped with an
emergency brake in case of mains breaks.
Under this circumstance, the linear ramps becomes qualified and the ramp time is imposed with the
parameter P30. When the minimum speed is reached, alarm A10 of minimum voltage starts and the
motor is left rotating in free evolution. If in the meantime the mains returns, the emergency brake will
be not interrupted.
2.3.1.3 BRAKING MANAGEMENT
The drive is in a position to work on four quadrants, therefore is also in a position to manage the
motor recovery Energy. There are three different, possible controls:
2.3.1.3.1 RECOVERY MAINS ENERGY
To be able to restore the kinetic Energy into the mains, it is necessary to use another OPEN drive ,
specifically the AC/DC Active Front End (AFE). A Power Factor Controller deals with the position to
have a power factor close to unity. Specific documentation is sent back from specific details. This
solution is adapted to those applications in which the additional cost justifies another drive with a lot
of energy that is recovered in the mains or for particular thermal dissipation problems in the use of a
braking resistor.
AC/DC
AFE
OPEN drive
Drive
OPEN drive
Motor
Mains
Inductor
U
V
+
-
U
V
+
-
time
speed
Break
mains
Return
mains
Minimum speed (P52)
540V
C34=3
Emergency brake
DC bus voltage
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