VLT
®
5000 Series
Select Torque control, speed feedback , if an en-
coder feedback signal is to be generated. This is
relevant in winder and extruder applications.
Torque control, speed feedback, is selected if it is to
be possible to change the speed direction, while at
the same time maintaining the torque reference.
Set the following parameters in order shown:
Torque control, speed feedback:
Parame-
ter:
Setting: Data value:
100 Configuration Torque control, speed feedback [5]
200 Output frequency, range/direc-
tion
201 Output frequency, low limit
202 Output frequency, high limit
203 Reference/feedback range
204 Minimum reference Only if [0] in par. 203
205 Maximum reference
414 Minimum feedback
415 Maximum feedback
306 Encoder feedback, input B [24]
307 Encoder feedback, input A [25]
329 Encoder feedback, pulse/rev
421 Speed PID low-pass filter time
448 Gear ratio
447 Torque regulation, speed feed-
back
449 Friction loss
After Torque control, speed feedback , has been
selected, the VLT frequency converter should be cal-
ibrated to ensure that the current torque equals the
torque of the VLT frequency converter. For this to be
ensured, a torque gauge must be fitted to the shaft
so as to enable accurate adjustment of parameter
447, Torque compensation , and parameter 449,
Friction loss . It is recommended to run an AMA be-
fore torque calibration. Proceed as follows before
beginning to use the system:
1. Fit a torque gauge to the shaft.
2. Start the motor with a positive torque reference
and a positive direction of rotation. Read the
torque gauge.
3. Using the same torque reference, change the di-
rection of rotation from positive to negative. Read
the torque and adjust it to the same level as for
the positive torque reference and direction of ro-
tation. This can be done by means of parameter
449, Friction loss.
4. Using a warm motor and approx. 50% load, set
parameter 447, Torque compensation , to match
the torque gauge. The VLT frequency converter
is now ready for operation.
MG.51.A1.02 - VLT is a registered Danfoss trade mark
81
Application configuration
To Next Page
Loading...
