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.
4-60 Bypass Speed From [RPM]
Array [4]
Range:
Function:
Application
dependent*
[Application dependant]
4-61 Bypass Speed From [Hz]
Array [4]
Range:
Function:
Application
dependent*
[Application dependant]
4-62 Bypass Speed To [RPM]
Array [4]
Range:
Function:
Application
dependent*
[Application dependant]
4-63 Bypass Speed To [Hz]
Array [4]
Range:
Function:
Application
dependent*
[Application dependant]
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
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.
2 Parameter Description
VLT
p
Automation VT Drive FC322
Programming Guide
70
MG.20.W1.22 - VLT
p
is a registered Danfoss trademark
2
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