Danfoss VLT 5000 Series Operating Instructions Manual page 151

If the feedback has been fitted to the gearshaft, a gear
ratio must be set - otherwise the frequency converter
will not be able to detect an encoder loss.
For a gear ratio of 1:10 (gearing down of motor
rpm), set the parameter value to 10.
If the encoder has been fitted directly on the motor
shaft, set the gear ratio to 1.00.
Please note, that this parameter only has influence
on the encoder loss function.
Description of choice:
Set the required value.
454 Dead time compensation
(DEADTIME COMP.)
Value:
Off (OFF)
On (ON)
Function:
The active inverter dead time compensation which is
part of the VLT 5000 control algorithm (VVC+) is causing
instability at standstill when working in closed loop
control. The purpose of this parameter is switching off
the active dead time compensation to avoid instability.
Description of choice:
Select Off [0] to inactivate the dead time compensation.
Select On [1] to activate the dead time compensation.
455 Frequency range monitor
(MON. FREQ. RANGE)
Value:
Disable
Enable
Function:
This parameter is used if warning 35 Out of frequency
range must be turned off in the display in process
control closed loop. This parameter does not
affect the extended status word.
Description of choice:
Select Enable [1] to enable the readout in the display
if warning 35 Out of frequency range occurs. Select
Disable [0] to disable the readout in the display if
warning 35 Out of frequency range occurs.
= factory setting. () = display text [] = value for use in communication via serial communication port
150
VLT
457 Phase loss function
(PHASE LOSS FUNCT)
Value:
Trip (TRIP)
Warning (WARNING)
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).
At Warning [1] 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
[0]
expectancy of the drive will be reduced
[1]
when the mains failure persists.
NB!:
At phase loss, the internal cooling fans
of some drive types cannot be powered.
In order to avoid overheating, an external
power supply can be connected.
IP00/IP20/NEMA
- VLT 5032-5052, 200-240 V
- VLT 5122-5552, 380-500 V
- VLT 5042-5602, 525-690 V
- IP54
- VLT 5006-5052, 200-240 V
- VLT 5016-5552, 380-500 V
- VLT 5042-5602, 525-690 V
See also Electrical Installation.
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[1] 483 Dynamic DC link compensation
(DC LINK COMP.)
Value:
Off
On
Function:
The frequency converter includes a feature, which
ensures that the output voltage is independent of
any voltage fluctuation in the DC link, e.g. caused
by fast fluctuation in the mains supply voltage. The
benefit is a very steady torque on motor shaft (low
torque ripple) under most mains conditions.
MG.51.A9.02 - VLT is a registered Danfoss trademark
®
5000 Series
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