Duff-Norton SK6420-6 - Manual (Page 5)

2-1. INSTALLATION PROCEDURES
Use Figure 6-2 as a guide to properly attach the SPA-
6420 AC Ball Screw Super-Pac™ actuator to your power
source.
2-2. LIMIT SWITCH ADJUSTMENT
CAUTION
Disconnect power before making any adjustments to the
limit switches.
IMPORTANT
Before attempting to set limit switch nuts by these
instructions, be certain that the red and blue motor leads
and the switch leads are connected properly per Figure
6-2. Unless leads are connected exactly as shown, the
following steps will be meaningless.
1.Setting Retracted Position
A. Do not install actuator in the intended
application at this time.
B. With nut retainer “A” installed in actuator
and the translating tube unstrained, operate
actuator toward retracted position until limit
switch nut “B” trips limit switch (see Figure 6-3).
NOTE
Translating tube may jam and rotate prior to tripping limit
switch.
C. Rotate the translating tube by hand until
distance between the housing clevis hole
centerline and the translating tube clevis hole
centerline equals the desired closed height. This
centerline to centerline dimension is not to be
less than the retracted centerline to centerline
dimension listed in Figure 1-6. If the two clevis
end holes are not oriented as required, rotate the
translating tube no more than 1/2 turn in either
direction until they are properly oriented.
D. Install actuator in application and check drift.
Slight readjustment in switch actuation may be
attained by removing nut restrainer “A” and
rotating limit switch nut “B” (1 notch of
rotation = .05 in. of screw travel). Replace nut
restrainer, “A”.
2. Setting Extended Position
A.Restrain the translating tube against rotation
by hand. Operate the actuator, toward the
extended position, until the distance between
the housing clevis hole centerline and the
translating tube clevis hole centerline equals the
desired extended height. This centerline to
centerline dimension is not to exceed the
SECTION II
INSTALLATION
5
extended centerline to centerline dimension
listed in Figure 1-6.
B. Remove nut restrainer “A” and rotate limit
switch nut “C” (see Figure 6-3) until it activates
the limit switch.
C. Replace nut restrainer “A”.
D. Install actuator in application and check the
unit's drift. Slight readjustment in switch
actuation may be attained by removing nut
restrainer “A” and (1) rotating limit switch nut
“B” to adjust retracted position or (2) rotating
limit switch nut “C” to adjust extended position
(1 notch of rotation = .05 in. of screw travel).
E. After adjusting limit switch nuts,
replace nut restrainer “A”. Operate the actuator
and readjust limit switch nuts as necessary to
achieve desired travel.
2-3. POST-INSTALLATION PROCEDURES
After actuator installation, position the air vent to prevent
moisture and dirt from entering the actuator. Vent can be
repositioned by loosening the set screw and rotating the
outer air tube into which the air vent is threaded. Spot drill
and re-tighten set screw.
If necessary, an elbow (1/8" female x 1/8" male
pipe thread) can be used for more effective positioning.
FOR UNITS WITH POTENTIOMETER
2-4. 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
S and
C CC CW W is approximately 100 ohms. This
will be the pot’s full retracted position.
DN-SK6420-6-1006 10/10/06 11:40 AM Page 5