Danfoss VLT 5000 Series Manual page 132

2 ENCODER
The parameter Encoder count per revolution Encoder count per revolution Encoder count per revolution Encoder count per revolution
Encoder count per revolution
contains the position feedback transmitter of the
actual encoder (incremental or absolute encoder)
in relation to one encoder revolution.
The number of quad-counts (qc) per revolution is
calculated from this information. Quadcounts are
the basic units for all path measurements.
Quadcounts are generated by extracting of all
edges of the A and B tracks. One encoder count
corresponds to four quad-counts.
The number of quad-counts per revolution is
needed for the index pulse search during the refe-
rence drive and for the conversion of velocity and
acceleration to internal units. . . . .
The Encoder counts per revolution Encoder counts per revolution Encoder counts per revolution also supplies Encoder counts per revolution
Encoder counts per revolution
information whether during a HOME or INDEX
movement the index signal has been missed. If
more than a complete revolution is executed with-
out registering an index signal then the correspon-
ding error message will be made.
Content
Encoder counts per revolution
Parameter Group
AXE
Unit
counts/revolution
Value range
1 ... MLONG
NB!
No negative values are allowed. Whether
index pulses are being used or not is
entered in the parameter HOMETYPE (40).
Limit values
In order to guarantee perfect functioning of the
SyncPos option the product of the Encoder counts
per revolution per revolution per revolution per revolution per revolution ENCODER (2) and the Maximum
velocity velocity velocity velocity in encoder revolution/sec of the limit velocity
frequency of the encoder input level (220 kHz) may
not be exceeded.
[ Encoder revolution
ENCODER * VELMAX
132
VLT
3
If this parameter is set to yes = 1, then movement
to the home position must be completed before
any other positioning movement can be com-
pleted.
For a motion command that is not executed with a
terminated home run the error O.ERR_6 is
triggered.
Content
Forced movement to home position
Parameter Group
AXH
Value range
0; 1
0 = Homerun is not forced.
1 = Homerun is forced.
Internally the parameters can also contain the
value 255, which indicates that a forced tracking of
the HOME position is necessary and has already
taken place.
# 500
to 1 and thus forcing tracking of the home position.
However, in this case it is necessary to consider
that all programs must complete a HOME com-
mand before the first motion command in order to
receive perfect functioning.
Encoder counts Encoder counts Encoder counts Encoder counts
Maximum Maximum Maximum Maximum
] ≤ 220 kHz
/
sec
® 5000 SyncPos option
HOME_FORCE
After being turned on the current position is
valid as the real index point
After turning on the VLT and after changing
axis parameters a forced tracking of the home
position must be made before a motion com-
mand is executed directly or by the program.
NB!
For safety reasons and to avoid false posi-
tioning the parameter should always be set
MG.10.J4.02 – VLT is a registered Danfoss trade mark
#0