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VLT
®
6000 HVAC Series
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 frequency. 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.
Note:
ASFM
has no function for VLT 6402-6602,
380-460 V and 6102-6652, 525-600 V.
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.
Description of choice:
At
Trip
[0] the frequency converter will stop the motor
within a few seconds (depending on drive size).
If
Autoderate & warning
[1] is selected, the drive
will export a warning and reduce the output current
to 30 % of I
VLT,N
to maintain operation.
At
Warning
[2] only a warning will be exported when
a mains failure occurs, but in severe cases, other
extreme conditions might result in a trip.
NB!:
If
Warning
has been selected, the life
expectancy of the drive will be reduced
when the mains failure persists.
NB!:
At phase loss, the cooling fans cannot be
powered and the frequency converter might
trip on overheating. This applies to:
IP 00/IP 20/NEMA 1
•
VLT 6042-6062, 200-240 V
•
VLT 6152-6602, 380-460 V
•
VLT 6102-6652, 525-600 V
IP 54
•
VLT 6006-6062, 200-240 V
•
VLT 6016-6602, 380-460 V
•
VLT 6016-6652, 525-600 V
411 Function at overtemperature
(FUNCT. OVERTEMP)
Value:
✭
Trip (TRIP)
[0]
Autoderate & warning
(AUTODERATE & WARNING)
[1]
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.61.A5.02 - VLT is a registered Danfoss trademark
118