Danfoss VLT DriveMotor FCP 106 Programming Manual page 53

Parameters
4-63 Bypass Speed To [Hz]
Range: Function:
0 Hz [ 0 - 500 Some systems call for avoiding certain
*
Hz] output speeds due to resonance problems
in the system. Enter the upper limits of the
speeds to be avoided.
4.5.5 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.
Procedure:
1. Stop the motor.
NOTICE
Smaller frequency converters have a ramp time of 3
seconds which can make it difficult to set the bypass
speeds. Adjust the ramp times in parameter 3-41 Ramp 1
Ramp Up Time and parameter 3-42 Ramp 1 Ramp Down
Time.
2. Select [1] Enabled in parameter 4-64 Semi-Auto
Bypass Set-up.
3. Press [Hand On] to start the search for frequency
bands causing resonances. The motor ramps up
according to the ramp set.
NOTICE
Terminal 27 Digital Input parameter 5-12 Terminal 27
Digital Input has coast inverse as default setting. This
means that [Hand On] does not start the motor if there
is no 24 V to terminal 27, so connect terminal 12 to
terminal 27.
4. 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
4-63 Bypass Speed To [Hz] (array). Repeat this for
each resonance band identified at the ramp-up
(maximum of 3 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 4-61 Bypass
Speed From [Hz].
6. When the motor has ramped down to stop, press
[OK]. The 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.
®
VLT DriveMotor FCP 106 and FCM 106 Programming Guide
If the frequencies for a certain resonance band are not
registered in the right order (frequency values stored in
4-63 Bypass Speed To [Hz] are higher than those in
4-61 Bypass Speed From [Hz]) or if they do not have the
same numbers of registrations for the 4-61 Bypass Speed
From [Hz] and 4-63 Bypass Speed To [Hz], all registrations
are canceled 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:
[0]
*
[1]
MG03N102 - Rev. 2013-12-02
Function:
Off
Enable
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