Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 113

Parameter Description
14-55 Output Filter
Option: Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
NOTICE
Reset the frequency converter after
selecting [2] Sine-Wave Filter Fixed.
CAUTION
OVERHEATING OF FREQUENCY
CONVERTER
Always set parameter 14-55 Output Filter to
[2] Sine-wave fixed when using a sine-wave
filter. Failure to do so can result in
overheating of the frequency converter,
which can result in personal injury and
equipment damage.
Select the type of output filter connected.
[0] No This is the default setting and should be used with
Filter dU/dt filters or high frequency common mode (HF-
*
CM) filters.
[1] Sine- This setting is for backwards compatibility. It does
Wave not limit the range of the switching frequency.
Filter
[2] Sine This parameter sets a minimum allowed limit to the
Wave switching frequency and ensures that the filter is
Filter operated within the safe range of switching
Fixed frequencies. Operation is possible with all control
principles. The modulation pattern is set to SFAVM,
which gives the lowest acoustic noise in the filter.
14-59 Actual Number of Inverter Units
This parameter is only relevant for high-power frequency
converters.
Range: Function:
Size related [ 1 - 1] Sets the actual number of operating
*
inverter units.
3.12.7 14-6* Auto Derate
This group contains parameters for derating the frequency
converter in case of high temperature.
14-60 Function at Over Temperature
Option: 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.
MG16H202
Programming Guide
14-60 Function at Over Temperature
Option:
[0] Trip
*
[1] Derate If the critical temperature is exceeded, the output
3.12.8 No Trip at Inverter Overload
In some pump 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 pump 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 pump to stop by coasting) and
issues an alarm.
Current
% of rated
Inverter
load
counter
Illustration 3.43 Output Current in Overload Condition
If the pump is unable to run continuously with the
demanded capacity, run it at reduced speed for a while.
Select parameter 14-61 Function at Inverter Overload to
automatically reduce pump speed until the output current
is below 100% of the rated current (set in
parameter 14-62 Inv. Overload Derate Current).
Parameter 14-61 Function at Inverter Overload is an
alternative to letting the frequency converter trip.
The frequency converter estimates the load on the power
section with an inverter load counter, which causes a
warning at 98% and a reset of the warning at 90%. At the
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Function:
The frequency converter trips (trip lock) and
generate an alarm. Cycle power to reset the alarm.
The motor restarts when the heat sink temperature
has dropped below the alarm limit.
current is reduced until the allowable temperature
has been reached.
110
105
100
95
~ ~
60s
Desired current>100%
100
98
90.7
Warning Warning
3 3
Time
Time
111