Danfoss VLT 5000 Series Operating Instructions Manual page 122

229 Frequency bypass, bandwidth
(FREQ BYPASS B.W.)
Value:
0 (OFF) - 100%
Function:
Some systems call for some output frequencies to be
avoided because of resonance problems in the system.
In parameters 230-233 these output frequencies can
be programmed for bypassing (Frequency bypass).
In this parameter (229), a bandwidth can be defined
on either side of these frequency bypasses.
The frequency bypass function is not active if par.
002 is set to Local and par. 013 is set to LCP
ctrl/Open loop or LCP+dig ctrl/Open loop.
Description of choice:
The bypass bandwidth is set as a percentage
of the bypass frequency which is selected
in parameter 230-233.
The bypass bandwidth indicates max. variation
of the bypass frequency.
Example: A bypass frequency of 100 Hz and a
bypass bandwidth of 1% are selected. In this case
the bypass frequency can vary between 99.5 Hz
and 100.5 Hz i.e. 1% of 100 Hz.
230 Frequency bypass 1 (FREQ. BYPASS 1)
231 Frequency bypass 2 (FREQ. BYPASS 2)
232 Frequency bypass 3 (FREQ. BYPASS 3)
233 Frequency bypass 4 (FREQ. BYPASS 4)
Value:
0.0 - parameter 200
Function:
Some systems call for some output frequencies to be
avoided because of resonance problems in the system.
Description of choice:
Enter the frequencies to be avoided.
See also parameter 229.
234 Motor phase monitor
(MOTOR PHASE MON)
Value:
Enable (ENABLE)
Disable (DISABLE)
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.51.A9.02 - VLT is a registered Danfoss trademark
Function:
In this parameter it is possible to select monitoring
of the motor phases.
0 (OFF) %
Description of choice:
If Enable is selected, the frequency converter
will react on a missing motor phase which will
result in alarm 30, 31 or 32.
If Disable is selected, no alarm is given if a motor phase
is missing. The motor can be damaged/overheated if it
runs on only two phases. It is therefore recommended
to keep the missing motor phase function ENABLED.
0.0 Hz
[0]
[1]
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VLT 5000 Series
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