14-10 Mains Failure
Option: Function:
[0] * No function The energy left in the capacitor
bank is used to drive the motor,
but is discharged.
[1] Ctrl. ramp-
down
The frequency converter performs a
controlled ramp down.
Parameter 2-10 Brake Function must
be set to [0] O.
[3] Coasting The inverter turns o and the
capacitor bank backs up the control
card. Backing up control card
ensures a faster restart when mains
is reconnected (at short power
zags).
[4] Kinetic back-
up
The frequency converter rides
through by controlling speed for
generative operation of the motor
utilising the moment of inertia of
the system as long as sucient
energy is present.
[5] Kinetic back-
up, trip
The dierence between kinetic
back-up with and without trip is
that the latter always ramps down
to 0 RPM and trips, regardless of
whether mains returns or not.
The function does not detect if
mains returns. This is the reason for
the relatively high level on the DC
link during ramp down.
A Normal operation
B Mains failure
C Kinetic back-up
D Trip
Illustration 3.40 Kinetic Back-up
Trip
[6] Alarm
[7] Kin. back-up,
trip w
recovery
This option is valid in VVC
+
only.
Kinetic back-up with recovery
combines the features of kinetic
back-up and kinetic back-up with
trip. This feature makes it possible
to select between kinetic back-up
14-10 Mains Failure
Option: Function:
and kinetic back-up with trip, based
on a recovery speed, congurable
in parameter 14-15 Kin. Back-up Trip
Recovery Level. If mains does not
return, the frequency converter
ramps down to 0 RPM and trips. If
mains returns while in kinetic back-
up at a speed above the value in
parameter 14-15 Kin. Back-up Trip
Recovery Level, normal operation is
resumed. This is equal to [4] Kinetic
Back-up. The DC level during [7] Kin.
back-up, trip w recovery is
parameter 14-11 Mains Fault Voltage
Level x 1.35.
Ref
U
DC
14-15
A B C D EA
130BC922.10
U
DC
[V]
n [RPM]
t [S]
t [S]
14-11*1.35
A Normal operation.
B Mains failure.
C Kinetic back-up.
D Mains return.
E Normal operation: ramping.
Illustration 3.41 Kinetic Back-Up,
Trip with Recovery where Mains
Returns above
Parameter 14-15 Kin. Back-up Trip
Recovery Level
If mains return while in kinetic
back-up at a speed below
parameter 14-15 Kin. Back-up Trip
Recovery Level, the frequency
converter ramps down to 0 RPM
using the ramp and then trips. If
the ramp is slower than the system
ramping down on its own, the
ramping is done mechanically and
U
DC
is at the normal level (U
DC, m
x
1.35).
Parameter Descriptions Programming Guide
M0010001 Danfoss A/S © 10/2019 All rights reserved. 147
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