Danfoss VLT 5000 Series Operating Instructions

VLT
®
5000 Series
Programming
Description of choice:
This function is only active in extended units, since
it requires the connection of external 24 V DC and a
brake resistor or discharge resistor; otherwise, the
data selection is limited to Disable [0].
This function can be activated by selecting a digital
input signal for Mains failure inverted . Select Disable if
this function is not required. Select Enable and connect
24 V DC external supply and a brake/discharge resistor.
See section Quick discharge.
409 Trip delay torque
(TRIP DELAY TORQ.)
Value:
0 - 60 sec. (OFF)
✭ OFF
Function:
When the frequency converter registers that the
output torque has increased up to the torque limits
(parameters 221 and 222) in the set time, cutting out
is effected when that time has passed.
Description of choice:
Select how long the frequency converter is to be
able to run at the torque limit before cutting out. 60
sec. = OFF means that the time is infinite; however,
the thermal monitoring will still be active.
410 Trip delay-inverter
(INV.FAULT DELAY)
Value:
0-35sec.
✭ Depends on type of unit
Function:
When the frequency converter registers an
overvoltage in the set time, cutting out is effected
after that time has passed.
Description of choice:
Select how long the frequency converter is to be able
to run at overvoltage before cutting out.
NB!:
If this value is reduced from the factory
setting, the unit may report a fault when the
mains voltage is turned on.
411 Switching frequency
(SWITCH FREQ.)
Value:
✭Depends on the unit output.
Function:
The set value determines the switching frequency of
the frequency converter. 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 411 until the frequency has been
obtained at which the motor is as low-noise as possible.
See also parameter 446 - switching pattern. See
derating in the Design Guide.
NB!:
Switching frequencies higher than 3.0 kHz (4.5
kHz for 60°C AVM) lead to automatic derating of
the maximum output of the frequency converter.
412 Output frequency dependent switching
frequency
(VAR CARRIER FREQ)
Value:
✭Not possible (DISABLE)
[0]
Possible (ENABLE)
[1]
Function:
This function makes it possible to increase the
switching frequency at a falling output frequency. Used
in applications with square torque characteristics
(centrifugal pumps and fans) in which the load
declines depending on the output frequency. However,
the maximum switching frequency is determined
by the value set in parameter 411.
Description of choice:
Select Not possible [0] if a permanent switching
frequency is desired.
Set the switching frequency in parameter 411. If
Possible [1] is selected the switching frequency will
decline at an increasing output frequency.
✭ = factory setting. () = display text [] = value for use in communication via serial communication port
MG.51.A9.02 - VLT is a registered Danfoss trademark
141

Danfoss VLT 5000 Series Specifications

General

Brand	Danfoss
Model	VLT 5000 Series
Category	DC Drives
Language	English