Danfoss VLT Brook Crompton Motor FCM 300 Design Manual page 57

Programming
stopping of the motor, e.g. in the case of leaks in the
water supply System.
Use Boost Time-Out, par. 472, to set the boost time-out. If
the boost set-point cannot be reached within the specified
time, the frequency converter will continue in normal
operation (Not entering sleep mode).
Description of choice:
Set the required Boost setpoint as a percentage of the
resulting reference under normal operation. 100%
corresponds to the reference without boost (supplement).
407 Wake up frequency
Value:
Par 404 Sleep frequency - par. 202 f
Function:
When the theoretical output frequency exceeds the preset
value, the frequency converter restarts the motor.
Description of choice:
Set the required frequency.
411 Switching frequency
Value:
1.5-14.0 kHz
Unit dependent
Function:
The setting determines the switching frequency of the
inverter. If the switching frequency is changed, this may
help to minimise possible acoustic noise from the motor.
Description of choice:
When the motor is running, the switching frequency is
adjusted in parameter 411 until the frequency has been
obtained at which the motor is as low-noise as possible.
See also parameter 446 - switching pattern. See
4.1.6 Thermal Protection and Derating
412 Variable switching frequency
Value:
Not possible (DISABLE)
Variable switching freq. (VAR. CARRIER FREQ.)
Temperature dep. sw. freq. (TEMP. DEP. FREQ.)
Function:
This function makes it possible to change the switching
frequency depending on the load. However, the maximum
switching frequency is determined by the value set in
parameter 411.
Description of choice:
Select [0] Not possible if a permanent switching frequency
is desired. Set the switching frequency in parameter 411.
If [1] Variable switching frequency is selected the switching
frequency will decline at an increasing output frequency.
This is used in applications with square torque character-
istics (centrifugal pumps and fans) in which the load
declines depending on the output frequency.
®
VLT DriveMotor FCM Series
If [2] Temperature dependent switching frequency is selected,
the switching frequency will decline at an increasing
inverter temperature, see Illustration 3.23.
50 Hz
MAX
[1500-14000]
This parameter allows connection of the overmodulation
function for the output voltage.
[0] Off means that there is no overmodulation of the
output voltage, which means that torque ripple on the
motor shaft is avoided. This can be a good feature, e.g. on
grinding machines.
[1] On means that an output voltage can be obtained
which is greater than the mains voltage (up to 5%).
[0]
[1]
[2]
Parameters 414 and 415 are used to scale the feedback
range to physical values used by the user. The setting will
also be the bounds of the reference (parameters 204 and
205).
Used together with Process, closed loop mode (parameter
100).
Is only active when parameter 203 has been set to [0] Min-
Max.
®
MG03BA02 - VLT is a registered Danfoss trademark
Illustration 3.23
413 Overmodulation function
Value:
Off (OFF)
On (ON)
Function:
Description of choice:
414 Minimum feedback
Value:
-100,000,000 - FB (par. 415)
HIGH
0.000
Function:
Description of choice:
415 Maximum feedback
Value:
(par. 414) FB - 100,000,000
LOW
3 3
[0]
[1]
[-100000000 -]
[0]
[- 100000000]
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