Parameter Settings - Danfoss VLT 5000 Operating Instructions Manual

Parameter settings

Now determine the parameter settings fitting this application. The following list of parameters can be
determined right away:
P701
P702 - P711
P712
P713
P714
P720
P721
P722
P723
P724
P728
P734
P747
P777
P778
Timing of the electromechanical brake (P715-P718)
If the application is not equipped with an electromechanical brake, P716-P718 are not very important.
Then, however, it is very important to set P715 to "0" to enable the drive also at standstill.
This application is equipped with mechanical brakes to allow it to stop rapidly even if the drive is some-
how prevented from stopping the motor (damaged motor cables, damaged or short circuited motor,
inverter overload and so on).
P716-P718 is provided to time the interaction between the mechanical brake and the drive. A description
of these parameters can be found in the parameter list above. In this application the default values of
P716 and P717 is used (200 ms) but the P718 setting is changed to 30 seconds to minimize wear of the
brake.
Setting P732 and P733
Distances are measured in quad-counts (QC) but defined in millimetres. Therefore, it is necessary to
measure how many QC correspond to how many millimetres. To do this the cart is first moved as far to
the left as possible by activating the "Manual jog negative" input (terminal 54). The position is then
marked on the application and the corresponding value of P795 is noted. Then the cart is moved as far
to the right as possible by activating the "Manual jog positive" input (terminal 53). The travelled distance
in mm is now measured from the position of the mark to the position of the cart. Likewise the distance in
QC is calculated by subtracting the current value of P795 from the noted value of P795.
In this example it is measured that 871380 QC correspond to 4000 mm.
To prevent eventually overflow the parameters values are a factor 10 smaller than the measured QC
and mm so P732 is set to "87138" and P733 is set to "400". Positions will now be displayed and entered
in millimetres. Settings like P732 set to "43569" and P733 set to "200" will also give the positions in
millimetres.
38
Positioning Controller
Default ("Positioning mode")
Determined during optimising of the PID controller
Default ("1")
Incremental encoder used ("0")
Encoder resolution ("4096")
Trapeze ramps is used for fastest response ("0")
Default (encoder mounted directly on motor) ("1")
Default (encoder mounted directly on motor) ("1")
Default ("100")
Default ("1500")
Default ("0")
Default ("0")
Default ("0")
Default ("0")
"0" – no password protection required
MG.50.P3.02 - VLT is a registered Danfoss trademark