Danfoss VLT AutomationDrive FC 302 Programming Manual page 147

Parameter Descriptions
14-10 Mains Failure
Note:
Options [1], [2], [5], [7] are not active when the option [2] Torque
is selected in parameter 1-00 Configuration Mode.
Option: Function:
U [V]
DC
U
14-11*1.35
n [RPM]
Ref
14-15
A Normal Operation
B Mains failure
C Kinetic back-up
D Mains return
E Normal operation: ramping
Illustration 3.55 [7] Kinetic Back-Up, trip with
recovery where mains return above
parameter 14-15 Kin. Backup Trip Recovery
Level.
If mains return while in kinetic back-up at a
speed below parameter 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 ramps down
on its own, the ramping is done motoric and U
is at the normal level (U
U [V]
DC
U
14-11*1.35
n [RPM]
Ref
A Normal Operation
B Mains failure
C Kinetic back-up
D Mains return
E Kinetic back-up, ramping to trip
F Trip
Illustration 3.56 [7] Kinetic Back-Up, trip with
recovery, trip slow ramp where mains return
below parameter 14-15 Kin. Backup Trip
Recovery Level. In this illustration a slow ramp
is used.
If the ramp is quicker than the system's ramp
down on, the ramping is done generatoric. This
results in a higher U
brake chopper/resistor brake.
®
VLT AutomationDrive FC 301/302 Programming Guide
A B C D A E
DC
t [S]
t [S]
DC
*1.35).
DC, m
A B C D E F
DC
t [S]
0
t [S]
which is limited using the
DC
MG33MI02 - Rev. 2013-11-20
14-10 Mains Failure
Note:
Options [1], [2], [5], [7] are not active when the option [2] Torque
is selected in parameter 1-00 Configuration Mode.
Option: Function:
A
U DC [V]
U DC
U DC
14-11*1.35
n [RPM]
Ref
0
A Normal Operation
B Mains failure
C Kinetic back-up
D Mains return
E Kinetic back-up ramping to trip
F Trip
Illustration 3.57 [7] Kinetic Back-Up, trip with
recovery where mains return below
parameter 14-15 Kin. Backup Trip Recovery
Level. In this illustration a quick ramp is used.
Limitation:
See the introduction text in
parameter 14-10 Mains Failure
B C D E F
t [s]
t [s]
145
3 3