M A G U I R E P R O D U C T S , I N C .
Rev: January 15, 2019
4
L o P r o R e c e i v e r
Principles of Receiver Operation
The LoPro is a material conveying receiver. Being that of a receiver, this unit requires the
addition of a stand-alone vacuum pump. The Maguire MCP pump is specially designed for this
purpose. A third-party pump control (part #: OPL-LPR-AVB) is also offered, so LoPro receivers
can be used with larger vacuum pump systems as well.
The LoPro will also require a regulated, non-lubricated 80 psi (5.5 Bar) compressed air
supply. This model incorporates a pneumatic vacuum shift valve, and filter clearing blow-off which
rely on this air supply.
A unique feature of this LoPro unit is the vertical height. While many other material loaders
and receivers can protrude 2 to 3 feet out the top of a hopper lid, the LoPro stands only 7-5/8”
(193 mm) out of a hopper lid. Despite its low clearance, it maintains a respectable capacity.
Another unique feature of the LoPro are their large opening for material discharge. This
large opening helps to provide fast, effective flow of any type of material from the receiver.
Principle of Controller Operation
The LoPro is powered with 24 VDC, which is supplied exclusively from the pump which it
is connected to via its signal cable. Multiple LoPro units can be wired to other each other so that
they all share a single pump (depending on throughput, on average up to 8 units, per pump).
The controller logic works off a first-in, first-out priority order. Adding receivers requires no
additional programming sequence or setup. Operators simply attach the next receiver’s input
connector to any other receiver’s output connector using a signal cable.
The LoPro receiver obtains its demand signal from the positioning of its counter-weighted
dump flap via a magnetic sensor. When a hopper is empty, the dump flap of the receiver will
swing shut, telling the it to run a loading cycle. When a LoPro has filled the hopper, the material
inside the hopper will hold the dump flap open, indicating not to run.
Alarm Routine
If a LoPro is running and material is not successfully being conveyed, an alarm will sound
indicating this to the operator. The receiver is able to detect this by observing the signal from
the dump flap sensor. At the end of the loading cycle, material should flow out of the receiver
causing the dump flap to temporarily swing open. The controller will see this happen; thus,
verifying material was successfully conveyed.
If the LoPro detects that material is not conveyed 5 consecutive times, the receiver will
enter an alarm routine to alert the operator. The alarm routine consists of 5 more loading
attempts with the alarm (buzzer) active, followed by a 2 min wait period. This sequence will
repeat until LoPro detects material being conveyed, or the alarm routine is exited by the
operator.
While the receiver is alarming, an operator can manually exit the alarm routine by
pressing the “set time” pushbutton twice (1
st
to silence the alarm, 2
nd
to exit the alarm routine
completely). Whether the alarm routine is exited naturally or manually, the LoPro will then
resume its standard operating procedure.