Southworth APCU Series, Operating And Maintenance Manual

Page: 21 / 46

APCU Owner’s Manual 21
Testing
1. Clear the area around the unit. Remove any ma-
terials which might get in the way of the load enclosure
as it raises or lowers. Be sure that the safety guards
are in place on both sides of the unit.
2. Warn others to stay away from the unit. Operate the
unit through its full range of travel. The load enclosure
should rise smoothly with a quiet humming sound, and
lower smoothly and quietly. Raise and lower the load
enclosure a few times to check the operation.
3. As the load enclosure lowers, notice how the bottom
of the enclosure meets the floor. The front edge (load
edge) of the enclosure should touch at the same time
as any other part of the enclosure. If any other part of
the base of the load enclosure touches before the front
edge, the floor is not flat. Insert shims above the low
spots on the floor, so that the base is flat and level.
WARNING!
If another part of the load enclosure
touches the floor before the front edge,
the machine may not stop automatically at
the correct moment. This may cause the
machine to try to lift itself off of the floor.
WARNING!
If the “Tilt Down” proximity switch is out
of adjustment, the machine may continue
to run when it should be stopped. This
may cause the machine to try to lift itself
off of the floor. This could cause damage
to the unit.
4. As a final step, clean up all spilled hydraulic fluid.
Spilled hydraulic oil is slippery, and may present a fire
hazard. If you clean up any spilled fluid, you will be
able to tell right away if the unit begins to leak.
Electrical Connections
DANGER!
This unit requires three-phase 460V AC.
This voltage can kill you. Don’t work with
the electrical parts unless you are a quali-
fied electrician.
WARNING!
The fuses or circuit breakers are designed
to reduce any fire hazard. Be sure to install
the fuses or circuit breakers.
1. Because the unit is designed for three-phase AC,
you must be sure the pump motor is turning in the right
direction. The load enclosure should start to move
quickly when you press the “up” or “down” button. If
the load enclosure does not move in 2 or 3 seconds,
don’t try to operate the unit! Exchange any two of the
three-phase leads. If this does not correct the problem,
see the troubleshooting instructions at the end of this
manual.
CAUTION!
The power unit is designed for three-phase
AC. If you connect the power so the motor
runs backwards, the load enclosure will
not move, and you may damage the pump.
Do not operate the unit for more than 2 or
3 seconds if you think the motor might be
turning backwards.
Checking the Hydraulic System
1.
Check the level of the hydraulic fluid in the system.
With the load enclosure lowered completely, the hydrau-
lic fluid can be checked by viewing the sight gauge on
the reservoir of the power unit.
Photo eyes and proximity switches may need occasional adjustments
over time. See the Adjustments and Replacement Procedures section of
this manual.