Danfoss VLT AutomationDrive FC 301 Programming Manual page 241

Parameter Descriptions
14-55 Output Filter
Option: Function:
control principles. For flux control
principle, program
parameter 14-56 Capacitance Output
Filter and
parameter 14-57 Inductance Output
Filter (these parameters have no
effect in VVC
modulation pattern is set to SFAVM,
which gives the lowest acoustic
noise in the filter.
14-56 Capacitance Output Filter
Compensation function of the LC filter requires the per phase
equivalent star-connected capacitance of the filter (3 times the
capacity between 2 phases when capacitance is delta
connection).
Range: Function:
Size [0.1 - 6500 Set the capacitance of the output
related uF] filter. The value can be found on
*
the filter label.
NOTICE
This is required for correct
compensation in flux mode
(parameter 1-01 Motor Control
Principle).
14-57 Inductance Output Filter
Range: Function:
Size [0.001 - 65 Set the inductance of the output
related mH] filter. The value can be found on
*
the filter label.
NOTICE
This is required for correct
compensation in flux control
principle
(parameter 1-01 Motor Control
Principle).
14-59 Actual Number of Inverter Units
Range: Function:
Size [ 1 - 1 ] Set the actual number of power
related units.
*
3.14.6 14-6* Auto Derate
This group contains parameters for derating the frequency
converter if there is high temperature.
M0013101
Programming Guide
14-60 Function at Over Temperature
Option:
+
and U/f ). The
[0]
[1]
3.14.7 No Trip at Inverter Overload
In some systems, the frequency converter has not been
sized properly to yield the current needed in all points of
the operational flow-head characteristic. At these points,
the motor needs a current higher than the rated current of
the frequency converter. The frequency converter can yield
110% of the rated current continuously for 60 s. If still
overloaded, the frequency converter normally trips
(causing the motor to stop by coasting) and issues an
alarm.
Illustration 3.64 Output Current in Overload Condition
If the motor is unable to run continuously with the
demanded capacity, run it at reduced speed for a while.
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Function:
If either heat sink or control card
temperature exceeds a factory-
programmed temperature limit, a
warning is activated. If the
temperature increases further, select
whether the frequency converter
should trip (trip lock) or derate the
output current.
Trip The frequency converter trips (trip
*
lock) and generates an alarm. Cycle
power to reset the alarm. The
motor restarts when the heat sink
temperature has dropped below
the alarm limit.
Derate If the critical temperature is
exceeded, the output current is
reduced until the allowable
temperature has been reached.
Current
% of rated
110
105
100
95
~ ~
60s
Desired current>100%
Inverter
load
counter
100
98
90.7
Warning
Time
Time
Warning
239
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