Danfoss VLT AQUA Drive FC 202 Programming Manual page 77

Parameter Description
3.6.3 4-6* Speed Bypass
Some systems require that certain output frequencies or
speeds are avoided due to resonance problems in the
system. A maximum of 4 frequency or speed ranges can
be avoided.
4-60 Bypass Speed From [RPM]
Array [4]
Range: Function:
Size related [ 0 - par. Some systems require that certain
*
4-13 RPM] output frequencies or speeds are
avoided due to resonance problems
in the system. Enter the lower limits
of the speeds to be avoided.
4-61 Bypass Speed From [Hz]
Array [4]
Range: Function:
Size related [ 0 - par. Some systems require that certain
*
4-14 Hz] output frequencies or speeds are
avoided 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:
Size related [ 0 - par. Some systems require that certain
*
4-13 RPM] output frequencies or speeds are
avoided 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:
Size related [ 0 - par. Some systems require that certain
*
4-14 Hz] output frequencies or speeds are
avoided due to resonance problems
in the system. Enter the upper limits
of the speeds to be avoided.
MG20OB02
Programming Guide
3.6.4 Semi-Automatic Bypass Speed Set-up
Use the semi-automatic bypass speed set-up to facilitate
the programming of the frequencies to be skipped due to
resonances in the system.
Carry out the following process:
1.
2.
3.
4.
5.
6.
If the frequencies for a certain resonance band are not
registered in the right order, all registrations are canceled
and the following message is shown: Collected speed areas
overlapping or not completely determined. Press [Cancel] to
abort. Registration in wrong order is when frequency
values stored in parameter 4-62 Bypass Speed To [RPM] are
higher than the values in parameter 4-60 Bypass Speed
From [RPM], or if they do not have the same numbers of
registrations for the Bypass From and Bypass To.
4-64 Semi-Auto Bypass Set-up
Option:
[0] Off
*
[1] Enabled Starts the semi-automatic bypass set-up and
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Stop the motor.
Select [1] Enabled in parameter 4-64 Semi-Auto
Bypass Set-up.
Press [Hand On] on the LCP to start the search for
frequency bands causing resonances. The motor
ramps up according to the ramp set.
When sweeping through a resonance band, press
[OK] on the LCP when leaving the band. The
actual frequency is stored as the first element in
parameter 4-62 Bypass Speed To [RPM] or
parameter 4-63 Bypass Speed To [Hz] (array).
Repeat this step for each resonance band
identified at the ramp-up (maximum 4 can be
adjusted).
When maximum speed has been reached, the
motor automatically begins to ramp down.
Repeat the above procedure when speed is
leaving the resonance bands during the
deceleration. The actual frequencies registered
when pressing [OK] are stored in
parameter 4-60 Bypass Speed From [RPM] or
parameter 4-61 Bypass Speed From [Hz].
When the motor has ramped down to stop, press
[OK]. Parameter 4-64 Semi-Auto Bypass Set-up
automatically resets to Off. The frequency
converter stays in hand-on mode until [Off] or
[Auto On] is pressed on the LCP.
Function:
No function.
continues with the procedure described in
chapter 3.6.4 Semi-Automatic Bypass Speed Set-up.
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