Sterlco SGBD Series Batch Gravimetric Blenders - Manual (Page 41)

BLN1-600A Chapter 3: Installation 41 of 116
supply wiring to the control panel. Care must be taken to ensure that the supply wiring does
not interfere with the low voltage DC wiring.
The blender is equipped with a plug that functions as the disconnect device (See Figure 11 on
Page 27 for an example). The mating receptacle must be installed no higher than 5’ feet
(1.6 m) above the floor. Make sure your installation conforms to your regional electrical
standards.
3-4 Pneumatic Connections
The Batch blending system uses plant-supplied compressed air to operate the metering and
dump valves on the blender.
CLEAN AND DRY air must be supplied to the blender. The air supply should be filtered
through a 5 micron air filter with a water separator. Oil should not be used unless air dryers
are installed on the compressed air supply. In this situation, an oiler may be required on the
blender to keep the air cylinder seals lubricated.
Figure 23: Customer-Supplied Pneumatic Components
The manufacturer provides all pneumatic lines on the blender piped to a single ¼” NPT
standard pipe thread fitting. The Batch blending system requires approximately 1 cfm (1.7
m³/hr) @ 60 psi (4.14 bar) maximum air pressure for proper operation.
The working pressure of the blender cylinders is not to exceed 60 psi (4.14 bar). This is
adjustable by the regulator supplied on the rear panel of the blender. It is important to prevent
fluctuation in the air pressure to the blender by not installing the unit on an airline. If this is
the case, an accumulator tank with a check valve may have to be provided by the customer to
ensure the blender a steady air supply.
To prevent damage to the equipment, do not exceed 60 psi (4.14 bar) air
pressure.
Always disconnect the compressed air supply when working on any part of
the blender.
3-5 Initial Set-up
This section will discuss the mechanical setup and control system setup of the Slide Gate
blending system. After reading this section, you should be familiar with the mechanical setup
and the electronic control setup of the blending system.
• As this blender uses air for blender metering functions, it is very important
to supply clean, dry air to the blender. Dirty or oily air can affect blender
accuracy; result in poor performance, and cause injury. Provide a 5-micron
air filter on the air supply to the blender, and be sure excess oil is removed.
Also, use a dedicated line to ensure proper air supply.