Semi-Automatic Bypass Speed Set-Up; Bypass Speed From; Bypass Speed To - Danfoss VLT Programming Manual

3 Parameter Description
4-61 Bypass Speed From [Hz]
Array [4]
Range:
Application [Application dependant]
dependent*
4-62 Bypass Speed To [RPM]
3
Array [4]
Range:
Application [Application dependant]
dependent*
4-63 Bypass Speed To [Hz]
Array [4]
Range:
Application [Application dependant]
dependent*

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
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
in par. 4-62 Bypass Speed To [RPM]
(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
[RPM] or par. 4-61
6. When the motor has ramped down to stop, press
converter will stay in
If the frequencies for a certain resonance band are not registered in the right order (frequency values stored in
in By Pass Speed From ) or if they do not have the same numbers of registrations for the
and the following message is displayed:
4-64 Semi-Auto Bypass Set-up
Option:
[0] * Off
[1] Enabled
76
Function:
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.
Function:
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.
Function:
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.
Semi-Auto Bypass Set-up
.
OK
on the LCP when leaving the band. The actual frequency will be stored as the first element
or par. 4-63 Bypass Speed To [Hz]
Bypass Speed From [Hz] .
OK . The par. 4-64
Hand mode until Off or Auto On are pressed on the LCP.
Collected speed areas overlapping or not completely determined. Press [Cancel] to abort
Function:
No function
Starts the Semi-Automatic Bypass set-up and continue with the procedure described above.
MG.11.C9.02 - VLT
®
VLT
(array). Repeat this for each resonance band identified at the ramp-up
OK will be stored in par. 4-60
Semi-Auto Bypass Set-up will automatically reset to Off. The frequency
By Pass Speed To
By Pass From and By Pass To
® is a registered Danfoss trademark
HVAC Drive Programming Guide

Bypass Speed From

are higher than those
, all registrations will be cancelled
.