Danfoss VLT FC 102 Programming Manual page 87

Parameter Descriptions
The table details the motor check at start for different
motor modes.
Option Motor U/f
VVC
Check at
Start
[0] Off No function
[1] Check for missing motor phase before
1)
On
start is executed or enables 3-phase
detection for U/f and VVC
4-58.
Table 3.12 Motor check at start for different motor types
1): When the motor check is done at start and a missing
motor phase is detected, the motor starts at trip 100 ms.
This means that parameter 4-58 Missing Motor Phase
Function is set to option [1] On.
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 [ 0 - par. 4-13 Some systems require that certain
related 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 [ 0 - par. 4-14 Some systems require that certain
related 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 [ 0 - par. 4-13 Some systems require that certain
related RPM] output frequencies or speeds are
*
avoided due to resonance problems
in the system. Enter the upper
limits of the speeds to be avoided.
M0010001
Programming Guide
Flux Flux
+
open closed
loop loop
+
in parameter
Danfoss A/S © 10/2019 All rights reserved.
4-63 Bypass Speed To [Hz]
Array [4]
Range: Function:
Size [ 0 - par. 4-14 Some systems require that certain
related Hz] 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 setup to facilitate
the programming of the frequencies to be skipped due to
resonances in the system.
Carry out the 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 1
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).
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 Off. The frequency
converter stays in hand-on mode until [Off] or
[Auto On] is pressed on the LCP.
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.
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