14-10 Line Failure
Option: Function:
NOTE!
For flying start in Line Failure: For flying start
to work best, the advanced motor data,
parameters 1-30 thru 1-35, must be correct.
[0]
*
No
function
This selection does not present a danger to the
adjustable frequency drive, but a trip lock would
normally be the result of the short voltage
interruptions.
[1] Ctrl. ramp-
down
This selection will keep the output frequency
following the motor speed. The IGBT will not lose
the connection to the motor, but will follow the
slow. This is particularly useful in pump
applications where the inertia is low and the
friction is high. When line power is restored, the
output frequency will ramp the motor up to the
reference speed (if the line power interruption is
prolonged, the controlled ramp-down might take
the output frequency all the way down to 0 rpm,
and when line power is restored, the application
is ramped up from 0 rpm to the previous
reference speed via the normal ramp-up).
[2] Ctrl. ramp-
down, trip
[3] Coasting Centrifuges can run for an hour without power
supply. In those situations, it is possible to select a
coast function at line power interruption,
together with a flying start which occurs when
line power is restored.
[4] Kinetic
backup
Kinetic backup will maintain the DC level as long
as possible, by converting the mechanical energy
from the motor to the DC level supply. Fans
normally can extend line power interruptions for
several seconds. Pumps can normally only extend
the interruptions for 1-2 seconds or fractions of
seconds. Compressors only for fractions of
seconds.
[5] Kinetic
backup,
trip
[6] Alarm
14-11 Mains Voltage at Mains Fault
Range: Function:
Application
dependent
*
[180 -
600 V]
This parameter defines the threshold
voltage at which the selected function in
14-10 Mains Failure should be activated.
The detection level is at a factor sqrt(2) of
the value in 14-11 Mains Voltage at Mains
Fault.
NOTE!
Note for converting between VLT
5000 and FC 300:
Even though the setting of the AC
Line Voltage at Line Power 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:
14-11 (VLT 5000 level) = Value used
in VLT 5000 * 1.35/sqrt(2).
14-12 Function at Mains Imbalance
Operating under severe line imbalance conditions reduces the
lifetime of the motor. Conditions are considered severe if the motor
operates continuously near nominal load (such as when a pump or
fan runs near full speed).
Option: Function:
[0]
*
Trip Trips the adjustable
frequency drive.
[1] Warning Issues a warning.
[2] Disabled No action
14-14 Kin. Backup Time Out
Range: Function:
60 s
*
[0 - 60 s] This parameter defines the Kinetic Backup
Timeout in flux mode when running on low
voltage grids. If the supply voltage does not
increase above the value defined in P14-11 + 5%
within the specified time, the drive will then
automatically run a controlled ramp-down profile
prior to stop.
Parameter Descriptions FC 300 Programming Guide
MG.33.MA.22 - VLT
®
is a registered Danfoss trademark 3-121
3
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