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11
Programmable Parameters (continued)
Total Measurement Range (continued)
Encoding Additional Turns
When the Scaling Function Control parameter is enabled, and the Counts per Turn parameter is set to a value less than the
maximum, the Total Measurement Range parameter can be used to require additional rotations of the shaft before the
position value reaches the roll over count . For example, assume a single turn RM-89 that has its Counts per Turn parameter
set to 360 and its Total Measurement Range parameter set to 64,800 . With this setup, the shaft of the RM-89 must rotate 180
turns, {64,800 ÷ 360}, before the position returns to zero . In this application, the single turn RM-89 acts as a 180 turn resolver
with one degree position resolution .
The same trade off between resolution and number of turns encoded can be made with the multi-turn RM-89 resolvers . For
example, if a 28-bit RM-89 resolver has its Counts per Turn parameter set to 360 and its Total Measurement Range parameter
set to its maximum of 268,435,456, the RM-89 will encode 745,654 .04 turns with one degree resolution .
In all of these applications, the RM-89 will act with the same motion restrictions listed in the Roll Over on Fractional Number
of Turns section above . Exceeding these limits will result in a position value error of at least ± 1 turn when power is re-applied .
Velocity Format
The RM-89 can transmit velocity data over the network in addition to position data . This parameter sets the units of measure
for the velocity data . This integer parameter has four fixed options .
•
16#1F04 (7,940 dec.)
= pulses/second
•
16#1F05 (7,941 dec.)
= pulses/millisecond
•
16#1F07 (7,943 dec.)
= pulses/minute
•
16#1F0F (7,951 dec.)
= RPM
Note:
Velocity data is always scaled by the Counts per Turn parameter . This is useful in applications where you require the full
position resolution, but want to scale velocity data to an engineering value such as inches/second, or boxes/minute .
Preset Value
This parameter allows you to preset the position to any value in its single or multi-turn range without rotating the shaft . The
range of values depends on the state of the Scaling Function Control parameter and the value of the Total Measurement
Range parameter .
•When
the
Scaling Function Control
parameter is disabled:
If the
Total Measurement Range
parameter equals zero, the Preset Value range is:
0 to 65,535 for single turn RM-89 resolvers
0 to 268,435,455 for multi-turn RM-89 resolvers
If the
Total Measurement Range
parameter is not equal to zero, the Preset Value range is:
0 to (value of
Total Measurement Range
parameter) - 1
•When
the
Scaling Function Control
parameter is enabled:
If the
Total Measurement Range
parameter equals zero, the Preset Value range is:
0 to ({value of
Counts per Turn
parameter} - 1) for single turn RM-89 resolvers
0 to ({value of
Counts per Turn
parameter * 4,096} - 1) for multi-turn RM-89 resolvers
If the
Total Measurement Range
parameter is not equal to zero, the Preset Value range is:
0 to (value of
Total Measurement Range
parameter) - 1
Summary of Contents for DeviceNet RM-89
Page 1: ...USER MANUAL MA1007 REV B Published 4 15 2015 RM 89 DeviceNet Resolver...
Page 14: ...14 www turck com 1 800 544 7769 Fax 763 553 0708 TURCK Minneapolis MN 55441 TURCK RM 89 Notes...
Page 38: ...38 www turck com 1 800 544 7769 Fax 763 553 0708 TURCK Minneapolis MN 55441 TURCK RM 89 Notes...
