Danfoss VLT Automation VT Drive FC 322 Programming Manual page 72

2 Parameter Description
2.6.4 4-6* Speed Bypass
Define the Speed Bypass areas for the ramps.
Some systems call for avoiding certain output frequencies or speeds, due to resonance problems in the system. A maximum of four frequency or speed
ranges can be avoided.
2
4-60 Bypass Speed From [RPM]
Array [4]
Range:
Application [Application dependant]
dependent*
4-61 Bypass Speed From [Hz]
Array [4]
Range:
Application [Application dependant]
dependent*
4-62 Bypass Speed To [RPM]
Array [4]
Range:
Application [Application dependant]
dependent*
4-63 Bypass Speed To [Hz]
Array [4]
Range:
Application [Application dependant]
dependent*
2.6.5 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
Bypass Speed To [RPM]
in par. 4-62
(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
70
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Function:
Function:
Function:
Function:
Semi-Auto Bypass Set-up
.
OK on the LCP when leaving the band. The actual frequency will be stored as the first element
Bypass Speed To [Hz]
or par. 4-63
Bypass Speed From [Hz]
.
OK . The par. 4-64
Hand Off Auto On
mode until or are pressed on the LCP.
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
(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
Programming Guide
Bypass Speed From