Checking Encoder Connection And Direction Of Rotation - Danfoss VLT5000 SyncPos Operating Instructions Manual

SYNCMPULSM (58) and SYNCMPULSS (59)
When using the encoder zero pulse as marker
signal the distance between 2 markers is the reso-
lution (qc) of the encoder.
When external marker signals are used, the marker
distance can be measured by means of the pro-
gram sample "Marker count" (see chapter 7) if it is
unknown.
SYNCMTYPM (60) and SYNCMTYPS (61)
Master marker type and Slave marker type.
Master marker signal: Input 5.
Slave marker signal: Input 6
Marker signal type must be selected for master
and slave:
0 = index pulse (positive flank)
1 = index pulse (negative flank)
2 = external marker (positive flank)
3 = external marker (negative flank)
■ ■ ■ ■ ■ Checking encoder connection and direction of
rotation
If you have not yet done so, now is the time to
connect and test the encoder.
N B!
Remember to turn off the power before
connecting the encoder.
Check the encoder connections by means of the
encoder test program. In the menu bar click on
"FILE" and "OPEN" the file Enc-
first test program for starting.
p e r a t i o n .
30
Enc-S.m Enc- Enc- Enc- S.m, which is the S.m S.m S.m
Programmable SyncPos motion controller
In the "DEVELOPMENT" menu click on "EXECUTE" in
order to start the test program. Run the drive forward for
example in local mode (Parameter 002 = "Local") then
the position must count positive. If the position is coun-
ting 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
applications
If there is a master synchronizing application change
the test program: replace the command APOS by
MAPOS in "Enc-S.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
and must be exchanged. Often it is easier to swap
two motor-phases though.
Or you simply use the parameter 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.
MG. 1 0.J8.02 – VLT is a registered Danfoss trade mark
Positive Direction Positive Direction Positive Direction Positive Direction