User's Manual

L12100
ELECTRIC MOTOR PUMPS
DESCRIPTION
The electric motor LubriSystem pump (Figure 8) is a rugged,
reliable pump for applications using oil or fl uid grease as the
lubricant. The motor itself is a high torque, gear-reduction motor
operating at 300 rpm and 115 VAC 50/60 Hz. (Other voltages are
available.) The motor drives a positive displacement, self-priming
gear pump capable of pumping at a rate of 2.0 cubic inches (32.8
cm
3
) per minute at 1,000 psi (69 bar). All electric motor pumps are
equipped with a Hirshman Connector. A 20 foot mating cable is
available as an accessory (see ordering information on page 16).
No motor starter or capacitor is required. Pumps may be ordered
with an integral solid-state timer or control may be provided by an
external system controller.
Reservoirs in several different sizes are available in transparent
plastic. All reservoirs mount directly to the pump and are easily
interchangeable. The level of oil in the reservoir is easily checked
due to the transparent plastic. Pumps are equipped with a fi ll stud
and fi lter screen to allow easy fi lling of the reservoir from a supply
source. Optional low-level switches and timers are available to
custom design your application.
MOUNTING
Sturdy bracket, with four mounting holes, holds pump with
motor, timer and reservoir. The assembled components should
be mounted in a protected, centralized and readily accessible
location. Pump must be mounted in a vertical position only, with
reservoir up. Use four 5/16 inch or M8 machine screws at the
mounting holes to ensure secure placement.
FEATURES / BENEFITS
PUMP FEATURES INCLUDE:
• Reliable gear pump design proven in mobile equipment
applications.
• Energy effi cient motor uses only 25 watts.
• Allows the design of an all-electric system; no air required.
OPERATION
Figure 9 portrays the pump in the “at rest” position. When the
motor (1) is energized, the gear pump (2) runs, drawing in
lubricant through inlet (3). Pressure builds in passage (4) moving
the poppet (5) to the right, sealing off the retainer (6) opening
to the tank. As the pump continues to run, pressure exceeds
the check valve (7) resistance. The check valve opens allowing
lubricant to fl ow through internal porting to the lube outlet and
injector distribution system. After 1250 psi (86 bar) is obtained,
the relief valve (8) vents excess fl ow back to the tank maintaining
constant pressure.
When the motor is de-energized, pressure relieves through the
orifi ce (9) and the check valve closes. The accumulator effect of
the system now pushes on the poppet until the force exceeds the
relieving force in passage (4). At this time the poppet moves to
the left, allowing lubricant pressure to vent to the tank through an
opening in the retainer passage. This allows the injectors in the
system to reset and prepare for the next cycle.
1
2
3
9
4
8
6
5
7
1. MOTOR
2. GEAR PUMP
3. INLET
4. PASSAGE
5. POPPET
6. RETAINER
7. CHECK VALVE
8. RELIEF VALVE
9. ORIFICE
Figure 8. Electric Motor LubriSystem Pump
Figure 9. Electric Motor Pump Operation
Page 13