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14-10 Mains Failure
Option:
Function:
[5] Kinetic
back-up,
trip
The difference between kinetic back-up with and
without trip is that the latter will always ramp
down to 0 RPM and trip, regardless of whether
mains return or not.
The function is made so that it will not even
detect if mains return, this is the reason for 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]
Illustration 3.55
A = Normal Operation
C = Kinetic back-up
B = Mains failure
D = Trip
Table 3.24
[6] Alarm
[7] Kin.
back-up,
trip w
recovery
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
14-15 Kin. Backup Trip Recovery Level
. In order to
make it possible to detect if mains return. If mains
do not return, the frequency converter ramps
down to 0 RPM and trips. If mains return while in
kinetic back-up at a speed above the value in
14-15 Kin. Backup Trip Recovery Level
, normal
operation is resumed. This is equal to [4] Kinetic
Back-up. The DC-level during [7] Kinetic back-up is
par. 14-11 * 1,35.
14-11*1.35
Ref
UDC
14-15
A
B
C
D
E
A
130BC922.10
U
n [RPM]
t [S]
DC [V]
t [S]
Illustration 3.56 [7] Kinetic Back-Up, trip with
recovery where mains return above
.
14-10 Mains Failure
Option:
Function:
A = Normal Operation D = Mains return
B = Mains failure
E = Normal operation:
ramping
C Kinetic back-up
Table 3.25
If mains return while in kinetic back-up at a speed
below
14-15 Kin. Backup 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 will ramp down on its own, the
ramping will be done motoric and U
DC
will be at
the normal level (U
DC, m
*1.35).
14-11*1.35
Ref
UDC
A
B
C
D
E
F
130BC923.10
0
U
n [RPM]
t [S]
DC [V]
t [S]
Illustration 3.57 [7] Kinetic Back-Up, trip with
recovery, trip slow ramp where mains return
below
14-15 Kin. Backup Trip Recovery Level
. In
this illustration a slow ramp is used.
A = Normal Operation D = Mains return
B = Mains failure
E = Kinetic back-up,
ramping to trip
C Kinetic back-up
F = Trip
Table 3.26
If the ramp is quicker than the system will ramp
down on its own, the ramping will be done
generatoric. This results in a higher U
DC
which is
limited using the brake chopper/ resistor brake.
14-11*1.35
UDC
0
UDC
Ref
A
B
C
D
E
F
130BC924.10
U
n [RPM]
t [
s
]
DC [V]
t [
s
]
Illustration 3.58 [7] Kinetic Back-Up, trip with
recovery where mains return below
. In this illustration a
quick ramp is used.
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
MG33ME02 - VLT
®
is a registered Danfoss trademark
131
3
3
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