1. The power is back before the energy from DC /moment of inertia from load is too low. The
frequency converter will perform a controlled ramp down when par. 14-11
Mains Voltage
at Mains Fault
level has been reached.
2. The frequency converter will perform a controlled ramp down as long as energy in the DC
link is present. After this point the motor will be coasted.
Kinetic back-up:
The frequency converter will perform a Kinetic back-up. If par. 2-10
Brake Function
is
Off
[0] or
AC
brake
[2] , the ramp will follow the Over Voltage Ramping. If par. 2-10
Brake Function
is [1]
Resistor
Brake
the ramp will follow the setting in par. 3-81
Quick Stop Ramp Time
.
Kinetic Back-up [4]: The frequency converter will keep on running as long as there is energy in the
system due to the moment of inertia produced by the load.
Kinetic Back-up [5]: The frequency converter will ride through on speed as long as the energy is
present from moment of inertia from the load. If the DC voltage goes below par. 14-11
Mains Voltage
at Mains Fault
the frequency converter will perform a trip.
3 Parameter descriptions FC 300 Programming Guide
196
MG.33.M8.02 - VLT
®
is a registered Danfoss trademark
3
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