14-10 Mains Failure
Option:
Function:
NOTE!
For the best kinetic backup performance,
the advanced motor data parameters,
1-30 Stator Resistance (Rs)
to
1-35 Main
Reactance (Xh)
, must be accurate.
[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
back-up
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
back-up,
trip
[6]
Alarm
[7]
Kin. back-
up, trip w
recovery
14-11 Mains Voltage at Mains Fault
Range:
Function:
Size
related
*
[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
14-11 Mains
Voltage at Mains Fault
+ 5% within the specified
time, the drive will then automatically run a
controlled ramp-down profile prior to stop.
Parameters for configuring auto reset handling, special trip
handling and control card self test or initialization.
14-20 Reset Mode
Option:
Function:
Select the reset function after
tripping. Once reset, the Adjustable
frequency drive can be restarted.
Parameter Descriptions
FC 300 Programming Guide
MG33MD22 - VLT
®
is a registered Danfoss trademark
3-129
3
3
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20872-Danfoss-131H4490-VLT-Automation-VT-Drive-VFD-FC302-460V-25-HP.aspx
