Danfoss VLT AQUA Drive FC 202 Programming Manual page 67

Parameter Description
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.
Carry out following process
1. Stop the motor.
2. Select Enabled in parameter 4-64 Semi-Auto Bypass
Set-up.
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 is stored as the first element in
parameter 4-62 Bypass Speed To [RPM] or
parameter 4-63 Bypass Speed To [Hz] (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 automatically begins to ramp down.
Repeat the above procedure when speed is
leaving the resonance bands during the
deceleration. The actual frequencies registered
when pressing OK are stored in
parameter 4-60 Bypass Speed From [RPM] or
parameter 4-61 Bypass Speed From [Hz].
6. When the motor has ramped down to stop, press
OK. Parameter 4-64 Semi-Auto Bypass Set-up
automatically resets to Off. The frequency
converter stays in Hand mode until Off or Auto
On is 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.
MG20O702
Programming Guide
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
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