Danfoss VLT AQUA Drive FC 200 Programming Manual page 67

Parameter Description
4-61 Bypass Speed From [Hz]
Array [4]
Range: Function:
Size related [ 0 - par. Some systems call for avoiding
*
4-14 Hz] certain output speeds due to
resonance problems in the system.
Enter the lower limits of the speeds
to be avoided.
4-62 Bypass Speed to [RPM]
Array [4]
Range:
Size related [ 0 - par. 4-13 Some systems call for avoiding
*
RPM] 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 - par. Some systems call for avoiding
*
4-14 Hz] certain output speeds due to
resonance problems in the system.
Enter the upper limits of the
speeds to be avoided.
3.6.5 Semi-Automatic Bypass Speed Set-up
The Semi-Automatic Bypass Speed Set-up 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 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 will be stored as the first element in
4-62 Bypass Speed to [RPM] or 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 will automatically begin to ramp down.
®
VLT AQUA Drive Programming Guide
Function:
®
MG20O622 - VLT is a registered Danfoss trademark
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 4-60 Bypass
Speed From [RPM] or 4-61 Bypass Speed From [Hz].
6. When the motor has ramped down to stop, press
OK. The 4-64 Semi-Auto Bypass Set-up will
automatically reset to Off. The adjustable
frequency drive 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 Start the Semi-Automatic Bypass set-up and
continue with the procedure described above.
3 3
3-41