Parker Compumotor - Page 4

PRODUCT NOTICE
Operating the L20 Linear Motor with the LE Drive
This product notice is a supplement to the LE Drive User Guide, part number 88-004577-03 A.
Performance
Considerations
Cooling
The LE Drive can be used in linear applications requiring low
EMI
emissions. The L20 forcer is normally run at 2.7 A.
producing an average static force of 20 lbs. The maximum
current setting on the LE Drive is 2A: consequently. at 2A. the
L20's static force is reduced to about 151bs. The maximum bus
voltage of the LE Drive is ±24V; therefore. the maximum
velocity of the L20 forcer is limited to about 25 inches/second
(ips).
To
ensure smooth operation and optimum microstep-to-
microstep accuracy, the L20 linear motor is factory-tuned to
the LE Drive with which it is ordered. For best performance.
the L20 forcer must be used with the corresponding LE Drive.
Both
the LE Drive and the accompanying L20 forcer have the
same serial number.
_When an L20 forcer is run With another LE Drive. it may run
rough. and the maximum cyclic-error (measure of the
microstep-to-microstep error) may double or triple. The
maximum cyclic error is ±0.OO03 inches (±7.6 microns).
To
change the forcer's default direction of travel. exchange the
Direction + input with the Direction - input coming into the
drive. Do not change the phasing on the forcer cable.
Changing the motor phasing makes the factory tuning
invalid.
The LE Drive heat Sinking capability is marginal at 2A
operation. The
LE Drive. however. does not come with an
optional fan kit: therefore. Compumotor strongly
recommends you use a fan for extra cooling. You can also
operate the LE Drive at a lower current to prevent thermo-
related shutdowns.
If accuracy and/ or repeatability are important. do not use the
standby mode. This may change the motor's position slightly
when the current is reduced. Do not use the current boost
mode.
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