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.
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 current 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 current 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 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 canceled
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
3-46
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3
To Next Page
Loading...
Need help?
General
