Danfoss VLT AQUA Programming Manual page 75

®
VLT AQUA Drive Programming Guide
4-62 Bypass Speed To [RPM]
Array [4]
0 RPM
4-63 Bypass Speed To [Hz]
Array [4]
*
0 Hz
2.6.5. Semi-Automatic Bypass Speed Set-up
The Semi-Automatic Bypass Speed Setup can be used to facilitate the programming of the fre-
quencies to be skipped due to resonances in the system.
The following process is to be carried out:
1.
2.
3.
4.
5.
6.
If the frequencies for a certain resonance band are not registered in the right order (frequency
values stored in
have the same numbers of registrations for the
be cancelled and the following message is displayed:
completely determined. Press [Cancel] to abort
*
[0 - par. 4-13 RPM] Some systems call for avoiding certain output speeds due to
resonance problems in the system. Enter the upper limits of the
speeds to be avoided.
[0 - par. 4-14 Hz] Some systems call for avoiding certain output speeds due to
resonance problems in the system. Enter the upper limits of the
speeds to be avoided.
Stop the motor.
Select Enabled in par. 4-64,
Hand On
Press on the Local Control Panel to start the search for frequency bands causing
resonances. The motor will ramp up according to the ramp set.
When sweeping through a resonance band, press
leaving the band. The actual frequency will be stored as the first element in the par. 4-62,
By Pass Speed To [RPM] or par. 4-63,
each resonance band identified at the ramp up (maximum four can be adjusted).
When maximum speed has been reached, the motor will automatically begin to ramp
down. Repeat the above procedure when speed is leaving the resonance bands during
the deceleration. The actual frequencies registered when pressing
par. 4-60, By Pass From [RPM]
When the motor has ramped down to stop, press
Feature
will automatically reset to Off. The frequency converter will stay in
Off Auto On
mode until or are pressed on the Local Control Panel.
By Pass Speed To
are higher than those in
®
MG.20.O2.02 - VLT is a registered Danfoss trademark
Semi-Auto by-pass Feature
.
OK
on the Local Control Panel when
By Pass Speed To [Hz]
or par. 4-61, By Pass From [Hz]
OK
. The par. 4-64,
By Pass Speed From
By Pass From By Pass To
and
Collected speed areas overlapping or not
.
2. Parameter Description
(array). Repeat this for
OK
will be stored in
.
Semi-Auto By-pass
Hand On
) or if they do not
, all registrations will
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