VLT
®
5000 Series
quency than 1.6 Hz, the Process regulator will not
react.
445
445 Flying start
(FLYING START)
Value:
✭Off (DISABLE)
[0]
On (ENABLE)
[1]
Function:
This function makes it possible to ‘catch‘ a motor,
which is spinning freely because of a mains drop-out
.
Description of choice:
Select Disable if this function is not required. Select
Enable if the VLT frequency converter is to be able
to ‘catch’ and catch and control a spinning motor.
See also the explanation of this function offered on
page 73.
446
446 Switching pattern
(SWITCH PATTERN)
Value:
60
AVM (60
AVM)
[0]
✭SFAVM (SFAVM)
[1]
Function:
Choose between two different switching patterns:
60
AVM and SFAVM.
Description of choice:
Select 60
AVM if the option of using a switching fre-
quency up to 14/10 kHz is required. Derating of the
rated output current I
VLT.N
is effected from a switch-
ing frequency of 4.5 kHz.
Select SFAVM if the option of using a switching fre-
quency up to 5/10 kHz is required. Derating of the
rated output current I
VLT.N
is effected from a switch-
ing frequency of 3.0 kHz.
447
447 Torque, speed feedback Torque compensa-
tion
(TOR-SF COMP.)
Value:
-100 - 100%
✭ 0%
Function:
This parameter is only used if Torque control, speed
feedback [5] has been selected in parameter 100.
Torque compensation is used in connection with cali-
bration of the VLT frequency converter. By adjusting
parameter 447, Torque compensation , the output
torque can be calibrated.
See section Setting of parameters, torque regulation,
speed feedback .
Description of choice:
Set the required value.
448
448 Torque, speed feedback Gear ratio with en-
coder
(TOR-SF GEARRATIO)
Value:
0.001 - 100.000
✭ 1.000
Function:
This parameter is only used if Torque control, speed
feedback [5] has been selected in parameter 100. If
an encoder has been fitted to the gearshaft, a gear
ratio must be set - otherwise the VLT frequency
converter will not be able to calculate the output fre-
quency correctly.
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.
Description of choice:
Set the required value.
449
449 Torque, speed feedback Friction loss
(TOR-SF FRIC. LOSS)
Value:
0.00 - 50.00% of rated motor torque
✭ 0.00%
Function:
This parameter is only used if Torque control, speed
feedback [5] has been selected in parameter 100.
Set the friction loss as a fixed percentage loss of
rated torque. In motor operation, the friction loss will
be added to the torque, while in generating opera-
tion it will be deducted from the torque.
See section Setting of parameters, torque regulation,
speed feedback .
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.51.A1.02 - VLT is a registered Danfoss trade mark
154
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