Metalfab Better-Weigh Feeders - Manual

Better-Weigh _ Feeders
Installation and Operating Instructions
Metalfab, Inc.
Vernon, NJ 07462 Phone (973)764-2000 Fax (973)764-0272 [email protected]
Contents:
• GENERAL DESCRIPTION
• INSTALLATION
• MAINTENANCE
• DISASSEMBLY
• ASSEMBLY
• PART LIST
• ENGINEERING DATA
• Load Cells
• Weigh Instruments
• Measuring Accuracy
• BATCH CONTROL
• CONTINUOUS CONTROL
GENERAL DESCRIPTION
When a process requires accuracies greater than 1 to 1 1/2% or it is necessary to record actual feed rates, feeding by
weight loss is the only method. Although material is fed in the same volumetric manner .... the screw flights are filled to
their maximum capacity with uniformly dense material .... required rates are actually monitored by a scaling system in
conjunction with either a batch or continuous controller. Weight of product being delivered is continuously monitored
against weight required.
The "BETTER-WEIGH" feeders are available in a variety of screw sizes and two (2) types of scaling systems. Model BWP
incorporates a platform scale, which consists of our unique screw feeder design with agitator/ conditioner screws, a
platform weigh scale and a controller. With the BWP, the total weight of the feeder and the weight of the product in the
hopper are sensed by the load cell in the platform scale and the combined weight, which will vary based upon the bulk
density of the material, determines the capacity of the load cell to be used.
Our "BETTER-WEIGH" feeder, model BWL, incorporates a lever balance scale system. With this method, the entire
weight of the feeder is counter balanced so that only the contents of the hopper are weighed. This system allows for the
minimal weighment of any product. open top hopper capacities of 2 to 5 cubic feet can be supplied with either model.
INSTALLATION
Even though we have designed our Better-Weigh®
weigh assemble with stops, you can permanently
damage the load cell if you drop, overload or allow
anything to impact the scale. Care should be taken
to eliminate these occurances.
The gearbox has been filled with oil and shipped with the
vent plug installed. To prevent spills, Keep the feeder
Upright.
The feeder should be located in an area with minimal
traffic or disturbances and mounted on a stable and level
support. After placing the feeder into position, remove
the shipping clips from the upper and lower weighing
deck. The weigh deck’s corner and load cell stops were
adjusted during assembly and should not field adjusted.
Use the wiring schematic supplied with the Better-
Weigh® feeder’s NEMA 4 enclosure and make your
connections to the motor and load cell terminals.
If you did not purchase our optional inlet and outlet
sleeves, connect the upstream and downstream
equipment with flexible connections. We recommend a
thin natural rubber or similar type material be used with
enough slack to prevent mechanical sticktion. The more
flexible the connections are, the better the accuracy you
can achieve.