29
MG.10.J4.02 – VLT is a registered Danfoss trade mark
VLT
®
5000 SyncPos option
■■
■■
■ Checking encoder connection and direction of
rotation
If you have not yet done so, now is the time to
connect and test the encoder.
NB!
Remember to turn off the power before
connecting the encoder.
Check the encoder connections by means of the
test program ”Drehgtst.m”. In the menu bar click
on "FILE" and "OPEN" the file
DrDr
DrDr
Dr
ehgtst.mehgtst.m
ehgtst.mehgtst.m
ehgtst.m, which
is the first test program for starting operation.
In the "DEVELOPMENT"
menu click on
"EXECUTE"
in order to start the test program. Run
the drive forward for example in local mode (Para-
meter 002 = ”Local”) then the position must count
positive. If the position is counting negative you
must swap A and B channels from the encoder or
two motor phases.
The position 0 is registered in the communications
window.
If you turn the motor by hand (the motor should not
be connected!), you can test whether the encoder
functions: the position is continuously registered in
the communications window.
For a full rotation you
should receive 4 times the value of the resolution
of the encoder, that means 2000 if the Encoder
counts per revolution is 500.
Checking encoder for master synchronizing applica-
tions
If there is a master synchronizing application
change the test program: replace the command
APOS by MAPOS in ”Dregtst.m" and run the master
forward then the master position must count
positive as well. If the position is counting negative
you must swap A and B channel from the master
encoder.
Checking direction of rotation
For this the VLT parameter 002 must also be set
and the motor is to be driven with a local set value
(Par. 003).
By turning the axis it is possible to make sure that
the direction of rotation is correct. When rotating to
the right, as viewed from the front, looking towards
the end of the axis, the impulse generator must
count up.
Otherwise the encoder tracks A and B as well as
A and B must be exchanged. Often it is easier to
swap two motor-phases though.
Or you simply use the parameter
Positive DirectionPositive Direction
Positive DirectionPositive Direction
Positive Direction
POSDRCT (28) to invert the evaluation of the
encoder information.
Ending the encoder check
End the test of the encoder with the
[ESC] key and
close the test program with "FILE"
→→
→→
→ "CLOSE".
A
successful test of the encoder is a requirement for
further starting up of operations.
If the encoder doesn’t work
This could be a result of incorrect cable installation.
Measure the signals coming from the encoder and
compare them to the values listed in the specifica-
tions.
Check whether the connection was made
according to the application.
Starting the SyncPos option step-by-step
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