Metalfab Better-Weigh Feeders - Manual (Page 6)

Better-Weigh _ Feeders
Installation and Operating Instructions
Metalfab, Inc. Vernon, NJ 07462 Phone (973)764-2000 Fax (973)764-0272 [email protected]
6
CONTROL FEATURES - "BETTER-WEIGH" CONTINUOUS LOSS-OF-WEIGHT FEEDER
Unlike the batch loss-of-weight feeders, the continuous
weighers deliver an ongoing flow of material. The
loss-of-weight of material per time is constantly
monitored in order to maintain a continuous
loss-of-weight with an accuracy of ± 0.25% to 0.5% with
(1) minute samples.
The METALFAB continuous controller is used to control
the speed of our "BETTER-WEIGH" feeders based on
the amount of material weight loss within a time period.
1. The rate targets are entered through the front
panel or can be down loaded to the indicator
using RS-232, optional RS-485 or Allen Bradley
Blue Hose communications.
2. After our "BETTER-WEIGH" continuous
controller has been installed, load cell and
automatic rate calibrations are performed. The
Proportion, Integral and Derivative factors are
automatically calculated and stored in the
indicator. This eliminates the trial and error
methods used by other manufacturers.
3. Operation of the control can be manual,
continuous or continuous batching. In all modes
of operation, the indicator monitors material
gross weight and initiates automatic refills with
high and low level alarms.
4. The feed rate can be set for lbs./sec., lbs./min.
or lbs./hr. A rate tolerance input is used to
provide a band for monitoring the indicator's
performance. If the rate is operating out of
tolerance for a set time, the indicator will output
an alarm and can be programmed to
automatically shut down the feeder.
5. The indicator uses vibration elimination to
remove noise from the raw digital data used for
weigh indication. The sensitivity can be preset to
eliminate noise from machines, motors or
vibrators.
6. As with our batch feeder control, both the SCR
DC drive and weigh indicator are mounted in the
same NEMA 4 enclosure having a power on/off
switch with light and indicator keypad and
display.
7. The control is supplied as 230/1/60 VAC. As an
option, 115/1/60 VAC can be supplied.
For a detailed description of the Continuous Control
and installation, calibration and operating
instructions, refer to the schematics and
instructions enclosed in our control enclosure.
Metalfab has designed our
Better-Weigh® machines to have:
The minimal “Dead Load”
The maximum “Live Load”
To use the smallest load cell capacity
With the biggest Resolution