Danfoss VLT 7000 Series, Руководство пользователя

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VLT® 7000 Booster
215 Current limit, I
LIM
(CURRENT LIMIT)
Value:
0.1 - 1.1 x I
VLT,N
✭
1.1 x I
VLT,N
[A]
Function:
This is where the maximum output current I
LIM
is set.
The factory setting corresponds to the rated output
current. Current limit should not be used for motor
protection; parameter 117 is for motor protection.
Current limit is for protection of the frequency converter.
If the current limit is set within the range of 1.0-1.1
x I
VLT,N
(the rated output current of the frequency
converter), the frequency converter can only handle a
load intermittently, i.e. for short periods at a time. After
the load has been higher than I
VLT,N
, it must be ensured
that for a period the load is lower than I
VLT,N
. Please
note that if the current limit is set to less than I
VLT,N
, the
acceleration torque will be reduced correspondingly.
If the drive is in current limit and a stop command
is initiated with the stop button on the LCP key
pad, the drive output is immediately turned off
and the motor will coast to a stop.
Description of choice:
Set the required maximum output current I
LIM
.
216 Frequency bypass, bandwidth
(FREQUENCY BYPASS B.W.)
Value:
0 (OFF) - 100 Hz
✭
Disable
Function:
Some systems call for some output frequencies to be
avoided because of mechanical resonance problems.
The frequencies to avoid can be programmed in
parameters 217-220 Frequency bypass .
In this parameter (216 Frequency bypass, bandwidth ),
a definition can be given of a bandwidth around
each of these frequencies.
Description of choice:
The bypass bandwidth is equal to the programmed
bandwidth frequency. This bandwidth will be centered
around each bypass frequency.
217 Frequency bypass 1
(BYPASS FREQ. 1)
218 Frequency bypass 2
(BYPASS FREQ. 2)
219 Frequency bypass 3
(BYPASS FREQ. 3)
220 Frequency bypass 4
(BYPASS FREQ. 4)
Value:
0 - 120/1000 HZ
✭
120.0 Hz
The frequency range depends on the selection made
in parameter 200 Output frequency range .
Function:
Some systems call for some output frequencies
to be avoided because of mechanical resonance
problems in the system.
Description of choice:
Enter the frequencies to be avoided.
221 Warning: Low current, I
LOW
(WARN. LOW CURR.)
Value:
0.0 - par. 222 Warning: High current I
HIGH
,
✭
0.0A
Function:
When the motor current is below the limit, I
LOW
,
programmed in this parameter, the display shows a
flashing CURRENT LOW, provided Warning [1] has
been selected in parameter 409 Function in case of no
load . The frequency converter will trip if parameter 409
Function in case of no load has been selected as Trip [0].
The warning functions in parameters 221-228 are
not active during ramp-up after a start command,
ramp-down after a stop command or while
stopped. The warning functions are activated when
the output frequency has reached the resulting
reference. The signal outputs can be programmed
to generate a warning signal via terminal 42 or
45 and via the relay outputs.
Description of choice:
The lower signal limit I
LOW
must be programmed within
the normal working range of the frequency converter.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.70.A1.02 - VLT is a registered Danfoss trademark
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