Poweramp VH SERIES HYDRAULIC 10.2011 - Manual (Page 31)

29 4111-0002 — Sept 2010
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.
After approximately 6 seconds, the platform must
return to the cross-traffic position.
10. 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.
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.
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