Danfoss VLT AutomationDrive FC 300 Programming Manual page 141

Parameter Descriptions
14-10 Mains Failure
Option:
3 3
[2] Ctrl. ramp-
down, trip
[3] Coasting
[4] Kinetic
back-up
[5] Kinetic
back-up,
trip
[6] Alarm
14-11 Mains Voltage at Mains Fault
Range:
Size [180 -
related 600 V]
*
140
FC 300 Programming Guide
Function:
loose the connection to the motor, but will follow
the speed down. This is particularly useful in
pump applications, where the inertia is low and
the friction is high. When the mains is restored,
the output frequency will ramp the motor up to
the reference speed (if the mains interruption is
prolonged, the controlled ramp down might take
the output frequency all the way down to 0 rpm ,
and when the mains is restored, the application is
ramped up from 0 rpm to the previous reference
speed via the normal ramp up).
Centrifuges can run for an hour without power
supply. In those situations it is possible to select a
coast function at mains interruption, together
with a flying start which occurs when the mains is
restored.
Kinetic back up 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 the mains 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.
Function:
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 faktor 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 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: 14-11 (VLT 5000
level) = Value used in VLT 5000 * 1,35/
sqrt(2).
MG.33.MB.02 - VLT
14-12 Function at Mains Imbalance
Operation under severe main imbalance conditions reduces the
lifetime of the motor. Conditions are considered severe if the motor
is operated continuously near nominal load (e.g. a pump or fan
running near full speed).
Option:
[0] Trip
*
[1] Warning
[2] Disabled
14-14 Kin. Backup Time Out
Range: Function:
60 s [0 - 60 This parameter defines the Kinetic Backup Time
*
s] Out 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.
3.15.3 14-2* Trip Reset
Parameters for configuring auto reset handling, special trip
handling and control card self test or initialisation.
14-20 Reset Mode
Option:
[0] Manual reset
*
[1] Automatic reset x 1
[2] Automatic reset x 2
[3] Automatic reset x 3
[4] Automatic reset x 4
[5] Automatic reset x 5
[6] Automatic reset x 6
[7] Automatic reset x 7
[8] Automatic reset x 8
[9] Automatic reset x 9
[10] Automatic reset x 10
[11] Automatic reset x 15
[12] Automatic reset x 20
[13] Infinite auto reset
[14] Reset at power-up
®
is a registered Danfoss trademark
Function:
Trips the frequency
converter
Issues a warning
No action
Function:
Select the reset function after tripping.
Once reset, the frequency converter
can be restarted.
Select Manual reset [0], to perform a
reset via [RESET] or via the digital
inputs.
Select Automatic reset x 1...x20 [1]-[12]
to perform between one and twenty
automatic resets after tripping.
Select Infinite Automatic Reset [13] for
continuous resetting after tripping.