Danfoss Metasys N2 Programming Guide

4-61 Bypass Speed From [Hz]
Array [4]
Range: Function:
Size related* [ 0 - par.
4-14 Hz]
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.
4-62 Bypass Speed To [RPM]
Array [4]
Range: Function:
Size related* [ 0 - par.
4-13 RPM]
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.
4-63 Bypass Speed To [Hz]
Array [4]
Range: Function:
Size related* [ 0 - par.
4-14 Hz]
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.
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. Stop the motor.
2.
Select [1] Enabled in parameter 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
ramps 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 is stored as the
rst element in
parameter 4-62 Bypass Speed To [RPM] or
parameter 4-63 Bypass Speed To [Hz] (array).
Repeat this for each resonance band
identied at
the ramp-up (maximum 4 can be adjusted).
5. 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].
6. When the motor has ramped down to stop, press
[OK]. Parameter 4-64 Semi-Auto Bypass Set-up
automatically resets to
O. The frequency
converter stays in Hand mode until [O] or [Auto
On] is pressed on the LCP.
If the frequencies for a certain resonance band are not
registered in the right order (frequency values stored in
Bypass Speed To are higher than those in Bypass Speed
From), or if they do not have the same numbers of
registrations for the Bypass From and Bypass To, all
registrations are cancelled and the following message is
displayed: Collected speed areas overlapping or not
completely determined. Press [Cancel] to abort.
4-64 Semi-Auto Bypass Set-up
Option: Function:
[0] * O No function.
[1] Enabled Starts the semi-automatic bypass set-up and
continues with the procedure described above.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
68 Danfoss A/S © 03/2015 All rights reserved. MG11CE02
33

Danfoss Metasys N2 Specifications

General

Brand	Danfoss
Model	Metasys N2
Category	DC Drives
Language	English