Danfoss VLT 8000 AQUA series Operating Instructions Manual page 134

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)
Fixed switching frequency
(FIXED SWITCHING FREQ.)
LC filter fitted (LC-FILTER CONNECTED)
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 reduce acoustic noise in the motor.
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 8502-8652,
380-480 V and VLT 8052-8652, 525-690 V.
409 Function in case of no load
(FUNCT. LOW CURR.)
Value:
Trip (TRIP)
Warning (WARNING)
Function:
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
= factory setting. () = display text [] = value for use in communication via serial communication port
134
VLT
below the threshold value in parameter 221
Warning: Low current, I
410 Function at mains failure
(MAINS FAILURE)
Value:
Trip (TRIP)
Autoderate & warning
(AUTODERATE & WARNING)
[0]
Warning (WARNING)
Function:
[1]
Select the function which is to be activated if the mains
[2]
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 to maintain operation.
VLT,N
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 8042-8062, 200-240 V
• VLT 8152-8652, 380-480 V
• VLT 8052-8652, 525-690 V
IP 54
• VLT 8006-8062, 200-240 V
[0]
• VLT 8016-8652, 380-480 V
[1]
• VLT 8016-8072, 525-600 V
• VLT 8052-8652, 525-690 V
411 Function at overtemperature
(FUNCT. OVERTEMP)
Value:
Trip (TRIP)
Autoderate & warning
(AUTODERATE & WARNING)
MG.83.A2.02 - VLT is a registered Danfoss trademark
®
8000 AQUA
.
LOW
[0]
[1]
[2]
[0]
[1]