Sterlco SGBD Series Batch Gravimetric Blenders - Manual (Page 34)

Bulletin Number Chapter 3: Installation 34 of 101
3-3 Electrical Connections
The standard Slide Gate/Auger blending system is designed to operate on 120/1/60 supply
voltage (220/1/50 CE models are also available). The current requirements vary with the
blender’s size and throughput rating. For exact current requirements, check the blender serial
number tag, located on the rear plate of the mixer section.
If a step down transformer was provided, it should never be used to power anything other
than the blender. Loading equipment, etc. must be powered by another power source. As well
as possibly overloading the transformer, the additional equipment may induce power line
noise that may affect the operation of the blending system.
The transformer will be mounted and wired by the customer or your installer. If company or
local codes require fusing or disconnects, these items must be supplied, wired, and mounted
by the customer.
Ensure that the power entrance location on the blender panel remains unchanged. Make sure
that the proper size wire and proper wire routing techniques are used when installing the
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 Slide Gate/Auger 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
Note: Each blending system MUST be connected to a separate source of
power. Do not connect other electrical equipment, especially self-
contained hopper loaders, on the same line as the blending system.
Note: 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.