Danfoss VLT AutomationDrive FC 301 Programming Manual page 234

Parameter Descriptions
14-10 Mains Failure
Options [1] Ctrl. ramp-down, [2] Ctrl. ramp-down, trip, [5] Kinetic
back-up, trip, [7] Kin. back-up, trip w recovery are not active when
the option [2] Torque is selected in parameter 1-00 Configuration
Mode.
3 3
Option:
232
®
VLT AutomationDrive FC 301/302
Function:
A B C D E F
U [V]
DC
U
DC
14-11*1.35
t [S]
n [RPM]
Ref
0
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 3.61 Kinetic Back-Up,
Trip with Recovery, Trip Slow
Ramp where Mains Returns
below Parameter 14-15 Kin. Back-
up Trip Recovery Level.
In this Illustration a Slow Ramp
is used.
If the ramp is quicker than the
ramp-down speed of the
application, the ramping generates
current. This results in a higher U
which is limited using the brake
chopper/resistor brake.
Danfoss A/S © 10/2019 All rights reserved.
14-10 Mains Failure
Options [1] Ctrl. ramp-down, [2] Ctrl. ramp-down, trip, [5] Kinetic
back-up, trip, [7] Kin. back-up, trip w recovery are not active when
the option [2] Torque is selected in parameter 1-00 Configuration
Mode.
Option:
14-11 Mains Fault Voltage Level
,
Range:
DC
Size [100 - 800 V] This parameter defines the
related
*
Function:
A B C D E F
U DC [V]
U DC
U DC
14-11*1.35
t [s]
n [RPM]
Ref
0
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 3.62 Kinetic Back-Up,
Trip with Recovery where Mains
Returns below
Parameter 14-15 Kin. Back-up Trip
Recovery Level.
In this Illustration a Quick Ramp
is used.
Function:
threshold voltage at which the
function in parameter 14-10 Mains
Failure is activated. Select the
detection level depending on the
supply quality. For a supply of 380
V, set parameter 14-11 Mains Fault
Voltage Level to 342 V. This results
in a DC detection level of 462 V
(parameter 14-11 Mains Fault Voltage
Level x1.35).
M0013101