Duff-Norton SK6905-100-1 - Manual (Page 5)

2-1. Installation Procedures
Use Figure 6.2 on page 14 as a guide to properly attach
the actuator to your power source.
2-2. Limit Switch Cam Adjustment
IMPORTANT
Before attempting to set limit switch cams by these
instructions, be certain that the red and black motor
leads and the “Cam” and “Gear Cam” switch leads
are connected to the proper capacitor terminals per
Figure 6.2. Unless leads are connected exactly as
shown, the following steps will be meaningless.
1. Set Retract Position
a. Do not connect translating tube to work piece
at this time.
b. Energize and retract actuator until gear cam
opens limit switch.
NOTE
Translating tube may have to jam and
spin prior to switch activation.
c. Unscrew the translating tube until the
measured distance between the housing clevis
hole centerline and the translating tube clevis
hole centerline equals the desired closed height.
If the mating clevis holes are not aligned,
manually rotate the translating tube to align the
clevises, this will be less than 180˚ rotation and
the closed height of the actuator will then be
within
1 / 4 ” of the desired retracted dimension.
d. Pin the translating tube clevis in place and
energize the actuator to check the drift.
2. Set Extend Position
a. Restrain the translating tube from turning,
operate actuator and extend to desired position.
b. Adjust steel switch cam until switch is
activated allowing for drift. (This is
accomplished by loosening socket head set
screw until cam rotates with a slight drag on the
shaft when the Allen wrench is used as a lever.)
c. Check travel and readjust if necessary.
d. Socket head set screw on cam should be
tightened after final adjustment is made. Do
not strip threads by overtightening.
At maximum load, repeatability is 1 / 8 ” in either direction
including drift and normal wear of parts.
FOR UNITS WITH
POTENTIOMETER
2-3. Potentiometer Installation
1. Loosen pot locknut and remove from actuator.
2. For best accessibility, solder leads to pot at this time.
3. Limit switches should be set for extreme limits of
travel per instructions. Limit switch cam adjustments
should be made per paragraph 2 prior to potentiometer
installation.
CAUTION
Do not engage potentiometer shaft gear teeth with
plastic worm before reading the following procedure.
Failure to adhere to the following procedure could
cause damage to the potentiometer.
4. Retract actuator translating tube until stopped by limit
switch.
5. a. For travels up to 9” (single turn pot):
i. Turn pot shaft counterclockwise until
resistance between terminal S and
CCW is approximately 100 ohms. This
will be the pot’s full retracted position.
ii. Being careful not to turn the pot shaft, slide
it into engagement with the plastic worm and
tighten locknut.
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
SECTION II
INSTALLATION
5