Metalfab Model DBIM (mini) Volumetric Screw Feeder - Manual (Page 2)

Caution
1. Do not change speed of an AC drive unless the motor is running.
2. Screw rotation must be clockwise when facing the discharge end of the
Feeder.
Operation
After the Feeder is in place and wired, it is ready for operation. Units equipped
with DC drives can have their speed adjusted at anytime, i.e., with the unit
stopped or in motion. The dial provides for setting screw speeds to 1 part in
1000. Speed is increased by dialing in the proper speed required.
The hopper should be filled with the feed material and the potentiometer should
be set to #500. The unit should be allowed to run for 5 minutes before a 1
minute sample is collected and weighed. It is suggested that 5 or more samples
be taken to assure the Feeder is operating properly. Once the feed rate is
known at setting #500, the required rate may then be obtained by proper speed
change. The drive and, therefore, the feed rates are linear, hence, at setting
#500 the Feeder will be operating at approximately half capacity. As an
example, if at a #500 setting a 20#/minute rate is achieved and a 10#/minute
rate is desired, change the setting to 250# and a 10#/minute rate will be
delivered. Take samples at 3 or 4 settings and plot a graph, setting versus rate.
From this graph, any feed rate may be selected.
Warning: Keep hands clear of all moving parts. Serious injury can occur.
Disassembly
Warning: Motor must be electrically Locked-out before any work is
performed.
The DB1M Feeder is easily disassembled for cleaning, changing of screws, or
maintenance purposes. To remove the discharge tube, loosen the hand nuts
(Part #10, Dwg. S-1902) and pull the tube forward until it disengages the screw.
To remove the screw (Part #1), the tube must be removed as indicated above
then:
1. Loosen the set collar on the reducer (Part #7).
2. Loosen set screw on shaft collar (Part #8) so it will fall from the screw shaft
when the screw is pulled forward.