14-10 Mains Failure
Option:
Function:
the relatively high level on the DC-
link during ramp down.
14-11*1.35
Ref
790 V
0
A
B
C
D
130BC920.10
U
n [RPM]
t [S]
DC
UDC
[V]
t [S]
A Normal operation
B Mains failure
C Kinetic back-up
D Trip
Illustration 4.41 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
and kinetic back-up with trip, based
on a recovery speed, configurable
in
parameter 14-15 Kin. Back-up Trip
. 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]
Kinetic back-up
is
parameter 14-11 Mains Fault Voltage
Level
x 1.35.
14-10 Mains Failure
Option:
Function:
Ref
U
DC
14-15
A B C D
E
A
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 4.42 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).
14-11*1.35
Ref
U
DC
A B C D
E
F
130BC923.10
0
U
DC
[V]
n [RPM]
t [S]
t [S]
A Normal operation
B Mains failure
C Kinetic back-up
D Mains return
E Kinetic back-up, ramping to trip
F Trip
Illustration 4.43 Kinetic Back-Up,
Trip with Recovery, Trip Slow
Ramp where Mains Returns
below
, in this
Illustration a Slow Ramp is Used
Parameter Descriptions
VLT® AutomationDrive FC 361
130
Danfoss A/S © 03/2019 All rights reserved.
MG06J202
4
4
Summary of Contents for VLT AutomationDrive FC 361
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