38
If the alarm condition starts, there is the possibility to enable, setting C35=1 the alarms to an
automatic reset at the mains restore
2.3.1.2.3 OVERCOMING MAINS BREAKS OF A FEW SECONDS
WITH FLYING RESTART (C34=2)
This operating procedure is adapted to those applications in which it is fundamental to not go into
alarm in the case of mains break out and is temporarily prepared to disable the power in order for the
motor to resume when the mains returns.
The qualification of such a function is obtained setting C34=2.
When there is a mains break or if the voltage of the Bus goes below the threshold set in P97r (425
V), the drive is immediately switched off, the motor rotates in free evolution and the Bus capacitors
slowly discharges. If the mains returns in a few seconds, a fast recovery of the motor is carried out in
a way in which the working regulation of the machine is resumed.
time
speed
Break
mains
Return
mains
Minimum voltage
allowed (P106)
540V
400V
C34=2
Free motor
DC bus voltage
Time of soft start
time
speed
DC bus voltage
Break
mains
Return
mains
Minimum voltage
allowed (P106)
540V
400V
C34=1
Recovery of Kinetic Energy
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