NB!
Switching frequencies higher than 4.5 kHz
implement automatic derating of the max-
imum 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 fre-
quency, 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 gener-
ate 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 fre-
quency 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 be-
low 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 cur-
rent, 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 ex-
treme conditions might result in a trip.
NB!
If Warning has been selected, the life ex-
pectancy 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
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.61.B5.02 - VLT
®
is a registered Danfoss trademark 143
Programming
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