General Description - Graco UniDrum C59784 Instructions And Parts List

General Description

A general description of the UniDrum Supply System
helps the installers and operators become familiar with
the system components. Contact your Graco
distributor for help in choosing accessories to suit your
particular needs.
Before you install the system, you should be familiar
with the parts described in the following paragraphs.
System Components
See F . 1 on page 9.
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• UniDrum Supply Unit (A,B) is usually setup to
alternate the material supply operation between the
left hand (LH) and right hand (RH) Supply Units,
which is accomplished using a combination of
pneumatic logic and manual operators. Drum
changeovers occur after the Follower Plate (D) has
reached its preset low limit level in the drum.
Alternating between Supply Units eliminates the
downtime that is usually expended unloading an
empty drum and reloading a full drum.
- LH Supply Unit (A) accommodates one 300
gallon (1200 liter) drum. The LH Supply Unit has
a local Pneumatic Logic Panel (G).
- RH Supply Unit (B) accommodates one 300
gallon (1200 liter) drum. The RH Supply Unit
has a local Pneumatic Logic Panel (G).
• The Pumps evacuate material from the drum. See
Models on page 4 for a complete list of pumps and
technical data.
• The Follower Plate (D) is connected to the ram
assembly and is designed to apply an even amount
of pressure to the material in the drum. With the
Follower Plate in its raised position, the operator
moves a drum inside the frame. The Follower Plate
is lowered directly on top of the material in the
drum. When pressure is applied to the Follower
Plate, the material is pumped out of the drum
through hoses, which are attached to the Pump
outlet ports. When the drum is empty, the operator
raises the Follower Plate, and removes the empty
drum. The process is repeated when another drum
is ready to be unloaded.
• Main Air Inlet Valve (E) is used to open or shutoff
the air supply to the entire Supply Unit.
309169ZAF
• Pneumatic Panel Air Filter (F) filters air to the
Pneumatic Logic Panel (G). The 20 micron filter
removes particles, such as dust, moisture, foreign
matter and other contaminants from the
compressed air.
• Bleed Sticks (H) are removed to allow air trapped
between the top of the material and Follower Plate
(D) to be evacuated. Typically, the Bleed Sticks are
removed and the Follower Plate is lowered until the
material is evident in the port. The Bleed Sticks are
replaced before pumping begins.
• Vent Cylinders (J) open to allow air back under the
Follower Plate (D) while
• The Safety Pins (M) are used to keep the ram from
lowering while in the fully raised position during
drum changes or maintenance of the supply
system.
Pneumatic Logic Panel (G)
See F . 2 on page 10 and F
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The Pneumatic Logic Panel (G) includes the following
system components. For more information, refer to the
Pneumatic Diagram on page 75.
• PUMP NO. 1 REGULATOR Control Knob (AC)
controls Pump speed and outlet pressure for Pump
No. 1 by adjusting the air pressure to the Pump.
• PUMP NO. 1 PRESSURE Air Gauge (AA) displays
the amount of air pressure supplied to Pump No. 1.
• PUMP NO. 2 REGULATOR Control Knob (AE)
controls Pump speed and outlet pressure for Pump
No. 2 by adjusting the air pressure to the Pump.
• PUMP NO. 2 PRESSURE Air Gauge (AB) displays
the amount of air pressure supplied to Pump No. 2.
• FOLLOWER VENT Directional Valve (AD) is
activated to open the vent to relieve container
pressure. This switch has two settings:
- In the AUTO setting, when the RAM POSITION
Switch (AG) is placed in the RAISE position, the
vent valves open after a short delay. This allows
air back under the Follower Plate (D), preventing
the creation of a vacuum under the plate. The
delay ensures that the downward force on the
Follower Plate can be overcome and prevents
material from flowing past the vents.
Component Identification
. 3 on page 11.
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