Poweramp POWERHOOK SERIES - Manual (Page 36)

OPTIONAL EQUIPMENT ADJUSTMENTS
6. Turn ON electrical power to the dock leveler.
7. Disengage the maintenance prop.
8. Turn the ARTD switch (on control panel) to the ON
position.
9. Raise the platform until the lip is fully extended,
then allow the platform to drift to the below-dock
position.
10. After approximately 6 seconds, the platform will
return to the cross-traffic position.
11. Adjust the proximity switch and target as
necessary. Make small adjustments, then operate
the dock leveler to check results. Do this until
satisfied with the ARTD operation.
12. Use the following illustrations to assist in fine
tuning and/or diagnosing the ARTD operation.
Cross-Traffic Position
NOTE: The platform lip is fully folded when the
platform is at the cross-traffic (stored) position (lip
engaged with keepers) or when platform is resting
on the maintenance prop.
Whenever the platform lip is at the cross-traffic
position, the following conditions will exist for a
normally operating ARTD:
• Target not in the sensing area of proximity switch.
• Proximity switch OFF (open) (no signal sent to
control panel).
• Proximity switch indicator light is OFF.
• Platform stays at this position unless the operator
activates the leveler.
A— 1/4 in. (6.4 mm)
Approximate
B— Target
C— 1 in. (25.4 mm)
Approximate
D— Lock Nuts
E— Proximity Switch
NOTE: Distances (A and C) are typical factory
settings. Use these dimensions only as a starting
point when adjusting the proximity switch and
target, especially if switch and/or target have been
replaced.
When dimensions (A and C) are obtained,
the proximity switch and target may need
finer adjustments to get the ARTD to operate
satisfactorily.
3. Loosen lock nuts (D). Adjust proximity switch (E) to
obtain distance (A). Tighten lock nuts.
4. Bend target (B) as needed to obtain distance (C).
Recheck distance (A) and readjust if necessary.
NOTE: At least two people may be required to
manually move the lip.
5. After adjusting proximity switch and target, slowly
move the lip up by hand while observing the
target and proximity switch. The target MUST
NOT contact the switch, otherwise, damage to
switch will occur. Readjust switch and/or target if
necessary, then recheck for interference.
ARTD Continued
IMPORTANT
Anytime proximity switch and target are adjusted,
always check for interference between target and
switch before operating the leveler. Damage to
switch will occur if the target contacts the switch.
The maximum torque for proximity switch lock nuts
is 27 N
•
m (29 lb-ft). Damage to switch will occur if
maximum torque is exceeded.
Lip Keeper
A
C
D E
B
4111-0010 — Nov 2010 34