Setting The Parameters - Danfoss VLT 5000 Operating Instructions Manual

Setting the parameters

For this work we recommend you to have the description of parameters at hand. See the VLT
5000/VLT5000Flux Operating Instructions.
NOTE: It is very important that the VLT is optimized for the motor before optimizing the
Synchronizing controller. First you record the motor data and perform an AMA (Automatic Motor
Adaptation) if possible and then you can start programming your synchronization functions.
Parameter 205
Parameter 221
Parameter 222
Parameter 701
Parameter 709
MG.10.N4.02 - VLT is a registered Danfoss trademark
Synchronizing controller
Maximum reference: Set the frequency for a value that is about 10% higher
than the maximum value of parameter 716.
Example:
1
Motor 7.5 kW, 1460 /
min
f * N
Nom Applicatio n
1 * 1 ,
=
N
Nom
Torque limit for motor mode: Set for maximum. – Choose a lower value, if
special safety precautions are necessary.
Torque limit for regenerative operation: Set for maximum. – Choose a lower
value, if special safety precautions are necessary
Record "1" to start the test program.
This parameter configures the velocity filter for speed synchronization. Since
speed synchronization is based on speed a small fluctuation in master speed,
when running at low speed, can have an effect on the pid loop control. Hence
this filter will even out the effect.
Cmdvel = Old_Cmdvel + (Actvel – Old_Cmdvel) * ms/tau_filt
Cmdvel = set velocity
Old_Cmdvel = last set velocity
Actvel = actual velocity of master
ms = sample time (parameter 777)
tau_filt = filter time constant
For standard encoders the following table can be used:
Encoder resolution
250
256
500
512
1000
1024
2000
2048
2500
4096
5000
at 50 Hz, speed of the application approx. 1800
1
50 Hz * 1800
min
* , 11
= 62Hz maximum ref. value
1
1460
min
Tau_filt (ms)
39500
38600
19500
19000
9500
9300
4500
4400
3500
1900
1400
1
/
min
43