4-58 Missing Motor Phase Function
Option:
Function:
Displays an alarm in the event of a missing
motor phase.
[0]
Disabled
No alarm is displayed if a missing motor phase
occurs.
[2]
*
Trip 1000 ms
NOTE
This parameter cannot be adjusted while the motor is
running.
3.6.3 4-6* Speed Bypass
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:
Size related
*
[0 - par. 4-13 RPM]
4-61 Bypass Speed From [Hz]
Array [4]
Range:
Function:
Size related
*
[0.0 - par. 4-14 Hz]
4-62 Bypass Speed To [RPM]
Array [4]
Range:
Function:
Size related
*
[0 - par. 4-13 RPM]
4-63 Bypass Speed To [Hz]
Array [4]
Range:
Function:
Size related
*
[0.0 - par. 4-14 Hz]
3.6.4 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
.
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
or
(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
or
.
6.
When the motor has ramped down to stop, press
OK
. The
will automat-
ically reset to Off. The frequency converter will stay
in
Hand
mode until
Off
or
Auto On
are pressed on
the LCP.
If the frequencies for a certain resonance band are not
registered in the right order (frequency values stored in
By
Pass Speed To
are higher than those in
By Pass Speed From
) or
if they do not have the same numbers of registrations for the
By Pass From
and
By Pass To
, all registrations will be 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]
*
Off
No function
[1]
Enabled Starts the Semi-Automatic Bypass set-up and
continue with the procedure described above.
Parameter Description
VLT
®
HVAC Drive Programming Guide
56
MG.11.CB.02 - VLT
®
is a registered Danfoss trademark
3
3
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