The table details the motor check at start for dierent
motor modes.
Option Motor
Check at
Start
U/f
VVC
+
Flux
open
loop
Flux
closed
loop
[0] O No function
[1]
On
1)
Check for missing motor phase before
start is executed or enables 3-phase
detection for U/f and VVC
+
in parameter
4-58.
Table 3.12 Motor check at start for dierent 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
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 lower limits
of the speeds to be avoided.
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 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
st
element in
parameter 4-62 Bypass Speed To [RPM] or
parameter 4-63 Bypass Speed To [Hz] (array).
Repeat this step for each resonance band
identied 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-on 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, 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.
Parameter Descriptions Programming Guide
M0010001 Danfoss A/S © 10/2019 All rights reserved. 85
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