VLT® 7000 Booster
401 Automatic restart time
(AUTORESTART TIME)
Value:
0 - 600 sec.
✭ 10 sec.
Function:
This parameter allows setting of the time from
tripping until the automatic reset function begins. It
is assumed that automatic reset has been selected
in parameter 400 Reset function.
Description of choice:
Set the desired time.
407 Switching frequency
(SWITCHING FREQ.)
Value:
Depends on the size of the unit.
Function:
The preset value determines the switching frequency of
the inverter, provided Fixed switching frequency [1] has
been selected in parameter 408 Interference reduction
method. If the switching frequency is changed, this may
help to minimise possible acoustic noise from the motor.
NB!:
The output frequency of the frequency converter
can never assume a value higher than 1/10
of the switching frequency.
Description of choice:
When the motor is running, the switching frequency
is adjusted in parameter 407 Switching frequency,
until the frequency has been achieved at which
the motor is as quiet as possible.
NB!:
Switching frequencies higher than 4.5 kHz
implement automatic derating of the maximum
output of the frequency converter. See
Derating of high switching frequency.
408 Interference reduction method
(NOISE REDUCTION)
Value:
✭ASFM (ASFM)
[0]
Fixed switching frequency
(FIXED SWITCHING FREQ.)
[1]
LC filter fitted (LC-FILTER CONNECTED)
[2]
Function:
Used to select different methods for reducing the
amount of acoustic interference from the motor.
Description of choice:
ASFM [0] guarantees that the maximum switching
frequency, determined by parameter 407, is used at
all times without derating of the frequency converter.
This is done by monitoring the load.
Fixed switching frequency [1] makes it possible to set a
fixed high/low switching frequency. This can generate
the best result, as the switching frequency can be set
to lie outside the motor interference or in a less irritating
area. The switching frequency is adjusted in parameter
407 Switching f requency. LC-filter fitted [2] is to be
used if an LC-filter is fitted between the frequency
converter and the motor, as the frequency converter
will otherwise not be able to protect the LC-filter.
409 Function in case of no load
(FUNCT. LOW CURR.)
Value:
Trip (TRIP)
[0]
✭Warning (WARNING)
[1]
Function:
This parameter can be used e.g. for monitoring the
V-belt of a fan to make sure it has not snapped. This
function is activated when the output current goes
below parameter 221 Warning: Low current.
Description of choice:
In the case of a Trip [1], the frequency converter
will stop the motor.
If Warning [2] is selected, the frequency converter
will give a warning if the output current drops
below the threshold value in parameter 221
Warning: Low current, I
LOW
.
410 Function at mains failure
(MAINS FAILURE)
Value:
✭Trip (TRIP)
[0]
Autoderate & warning
(AUTODERATE & WARNING)
[1]
Warning (WARNING)
[2]
Function:
Select the function which is to be activated if the mains
imbalance becomes too high or if a phase is missing.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.70.A1.02 - VLT is a registered Danfoss trademark
78
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