Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 66

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
3 3
be avoided.
4-60 Bypass Speed From [RPM]
Array [4]
Range:
Size related
*
4-13 RPM]
4-61 Bypass Speed From [Hz]
Array [4]
Range:
Size related
*
4-14 Hz]
4-62 Bypass Speed To [RPM]
Array [4]
Range:
Size related
*
4-13 RPM]
4-63 Bypass Speed To [Hz]
Array [4]
Range:
Size related
*
4-14 Hz]
64
Function:
[ 0 - par. Some systems require that certain
output frequencies or speeds are
avoided due to resonance problems
in the system. Enter the lower limits
of the speeds to be avoided.
Function:
[ 0 - par. Some systems require that certain
output frequencies or speeds are
avoided due to resonance problems
in the system. Enter the lower limits
of the speeds to be avoided.
Function:
[ 0 - par. Some systems require that certain
output frequencies or speeds are
avoided due to resonance problems
in the system. Enter the upper limits
of the speeds to be avoided.
Function:
[ 0 - par. Some systems require that certain
output frequencies or speeds are
avoided due to resonance problems
in the system. Enter the upper limits
of the speeds to be avoided.
Danfoss A/S © 05/2016 All rights reserved.
®
VLT Refrigeration Drive FC 103
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 following process:
1.
2.
3.
4.
5.
6.
If the frequencies for a certain resonance band are not
registered in the right order (frequency values stored in
parameter 4-62 Bypass Speed To [RPM] are higher than
those 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, all registrations are
canceled and the following message is shown: Collected
speed areas overlapping or not completely determined. Press
[Cancel] to abort.
4-64 Semi-Auto Bypass Set-up
Option:
[0] Off
*
[1] Enabled Starts the semi-automatic bypass set-up and
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 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 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.
MG16H202