
H. DESCRIPTION OF PARAMETERS
B–63443EN/02
APPENDIX
304
Setting command multiply (CMR), detection multiply (DMR), and
the capacity of the reference counter
Detection
unit
Least command
increment
CMR
Error counter
DA
converter
To velocity control
DMR
Feedback pulse
Position
detector
+
*
Reference
counter
Fig.H.8 CMR, DMR, and the Capacity of the Reference Counter
Set the magnification ratios of CMR and DMR so that the weight of
positive inputs to the error counter equals that of negative inputs.
Least command increment/CMR = detection unit = feedback pulse
increment/DMR
The feedback pulse unit varies according to the type of transducer.
Feedback pulse unit = the amount of travel per rotation of the pulse
coder/the number of pulses per rotation of the pulse coder
As the size of the reference counter, specify the grid interval for return
to the reference position in the grid method.
Size of the reference counter = Grid interval/detection unit
Grid interval = the amount of travel per rotation of the pulse coder
The value set in the parameter is obtained as follows:
(1) When command multiply is 1/2 to 1/27
Set value +
1
(Command multiply)
) 100
Valid data range: 102 to 127
(2) When command multiply is 1 to 48
Set value = 2 command multiply
Valid data range: 2 to 96
NOTE
When command multiply is 1 to 48, the set value must be
determined so that an integer can be set for command
multiply.
1821 Reference counter size for each axis
Data type: 2-word axis
Unit of data: Setting unit
Valid data range: 0 to 99999999
Set the size of the reference counter.
NOTE
When this parameter has been set, the power must be
turned off before operation is continued.