4-62 Bypass Speed To [RPM]
Array [4]
Range:
Function:
Size related
*
[ 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.
4-63 Bypass Speed To [Hz]
Array [4]
Range:
Function:
Size related
*
[ 0.0 - 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.
3.6.4 Semi-Automatic Bypass Speed Set-up
The Semi-Automatic Bypass Speed Setup can be used to
facilitate the programming of the frequencies to be
skipped due to resonances in the system.
The following process is to be carried out:
1.
Stop the motor.
2.
Select Enabled in
.
3.
Press
Hand On
on the LCP to start the search for
frequency bands causing resonances. The motor
will ramp up according to the ramp set.
4.
When sweeping through a resonance band, press
OK
on the LCP when leaving the band. The actual
frequency will be stored as the first element in
or
(array). Repeat this for each resonance
band identified at the ramp-up (maximum four
can be adjusted).
5.
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
OK
will be stored in
or
6.
When the motor has ramped down to stop, press
OK
. The
will
automatically reset to Off. The frequency
converter will stay in
Hand
mode until
Off
or
Auto
On
are pressed on the LCP.
If the frequencies for a certain resonance band are not
registered in the right order (frequency values stored in
By
Pass Speed To
are higher than those in
By Pass Speed From
)
or if they do not have the same numbers of registrations
for the
By Pass From
and
By Pass To
, all registrations will be
cancelled and the following message is displayed:
Collected
speed areas overlapping or not completely determined. Press
[Cancel] to abort
.
4-64 Semi-Auto Bypass Set-up
Option:
Function:
[0]
*
Off
No function
[1]
Enabled Starts the Semi-Automatic Bypass set-up and
continue with the procedure described above.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CC.02 - VLT
®
is a registered Danfoss trademark
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