Duff-Norton TracMaster 6415 Series Manuel - Page 6
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iii. Re-check resistance. If necessary loosen locknut
slightly and twist pot to re-establish 100 ohm
resistance. Pot does not have end of travel
stops, but has a 20˚ deadband between the two
ends of the resistive element. No continuity will
be measured to terminal S if the slider is in the
deadband.
iv. Run actuator to full extension (do not let tube rotate)
until it is stopped by its limit switch.
v. Check resistance between S and CCW to be sure
the slider is still on the element and the resistance
is greater than 100 ohms. The pot has enough
rotation for 9.43 inches of travel. (For strokes
shorter than 9", the retracted resistance can be
increased so that pot adjustment is less critical.
5b. For travels greater than 9" (multi-turn pot):
i. Turn pot shaft counterclockwise until it reaches
its stop. Now turn shaft back clockwise 1/4 turn.
ii. Without turning pot shaft, slide pot onto engage-
ment with the plastic worm and tighten locknut.
3-1. Operational Procedures
This motor draws anywhere from 6 amps at no load to
27 amps at rated load. Make sure that the duty cycle to
which the actuator is subjected is not too severe for the
motor.
All wiring, switches, circuit breakers, etc. must be of
sufficient capacity to carry these currents. Avoid using a
voltage supply lower than 11 volts DC.
The axis of the clevis pins should be parllel so that the
actuator can pivot without binding. A few drops of oil
should be used on the clevis pins.
The preset brake will provide consistent braking for
the actuator. However, in the event the brake friction
surfaces become worn as indicated by excessive drift,
the brake will require rebuilding. To aid in rebuilding,
a repair kit with step by step instructions is available
through Duff-Norton Company under repair kit part
number SK-6415-41. The repair can be performed by the
customer or by any authorized repair station.
iii. Starting 1/4 turn from the end, the 3-turn pot has
enough rotation for 25" of actuator travel.
6. With this set-up, potentiometer will have increasing
resistance from S to CCW (and decreasing
resistance from S to CW) as the actuator extends.
2-5. Digital Position Indicator (Duff-Norton
part no. SK6300-4K)
The model SK6300-4K is a highly versatile, panel mount,
digital readout device that provides a very precise
indication of actuator position. It can be programmed
to display percentage, inches, or any other desired
unit. The indicator is self calibrating with no need for
measurements or calculations.
See detailed instructions with the SK6300-4K indicator for
installation and programming instructions. Potentiometer
terminal CCW should be connected to indicator Common,
CW to Excitation Voltage, and S to Signal Voltage Input.
Section III
Operation
This actuator is not recommended for use in
applications where it can be jammed. Examples of
jamming include overtraveling the limit switches and
thus jamming the nut and screw internally at the
extreme ends of the stroke, and driving the actuator
against an immovable object and thus severely
overloading it. This actuator can jam a limited
number of times without damage. Therefore, consult
Duff-Norton Engineering if jamming is expected.
Do not operate actuator before setting limit switches.
Some actuator external surface temperatures may
reach 230˚F at or near maximum allowable duty cycle.
6
WARNING