Danfoss VLT AutomationDrive FC 302, Programming Manual, Page: 195 / 346

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: 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 3.60 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 mechan-
ically 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 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
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: Function:
current. 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
]
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
14-11 Mains Fault Voltage Level
Range: Function:
Size
related
*
[100
- 800
V] This parameter defines the 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).
NOTICE
Converting from VLT 5000 to FC 300:
Even though the setting of the mains
voltage at mains fault is the same for
VLT 5000 and FC 300, the detection
level is different. Use the following
formula to obtain the same detection
level as in VLT 5000:
Parameter 14-11 Mains Fault Voltage
Level
(VLT 5000 level) = value used in
VLT 5000 x1.35/sqrt(2).
Parameter Descriptions Programming Guide
MG33MP02 Danfoss A/S © 10/2018 All rights reserved. 193
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