4-61 Bypass Speed From [Hz]
Array [4]
Range: Function:
Application
dependent*
[Application dependant] Some systems call for avoiding 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: Function:
Application
dependent*
[Application dependant] 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:
Application
dependent*
[Application dependant] 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.
3.6.5 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 par. 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 par. 4-62
Bypass Speed To [RPM]
or par. 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. 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 par. 4-60
Bypass Speed From
[RPM]
or par. 4-61
Bypass Speed From [Hz]
.
6. When the motor has ramped down to stop, press
OK
. The par. 4-64
Semi-Auto Bypass Set-up
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.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
76
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3
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