Grounding; Overview; Optional Cycle Detection Spool Sensors - Graco Dispensit 1052 Operation & Maintenance Manual

Grounding

This product must be grounded. In the event of an elec-
trical short circuit, grounding reduces the risk of electric
shock by providing an escape wire for the electric cur-
rent.
Metering valve: attach ground wire from grounding lug
to true earth ground. See Component Identification
starting on page 9.
Fluid hoses: use only electrically conductive hoses.
Feed system components: attach ground wire from
grounding lug to true earth ground. See feed system
manual for grounding points.
Fluid supply container: follow local code.
Solvent pails used when flushing: follow local code.
Use only conductive metal pails, placed on a grounded
surface. Do not place the pail on a nonconductive sur-
face, such as paper or cardboard, which interrupts
grounding continuity.

Overview

This single-component meter and dispense device
accurately meters liquid and semi-paste materials.
The machine is ideal for a single-component application
requiring very small and precisely mixed shots.
The ratio of the pneumatic cylinder area to pump shaft
area provides the adjustable pressure intensification
needed to move the separate liquids through the needle
with a flow rate suitable for production requirements.
The complete system is enclosed. See Sequence of
Operation on page 17.
3A0231F
Optional Cycle Detection
Spool Sensors
The spool sensors are magnetic reed switches and
must be connected to an electrical control. An LED on
the switch illuminates to indicate the shifting of the
spool.
Optional Cycle Detection
Sensors
The sensors are magnetic reed switches and must be
connected to an electrical control package. The sensors
wires are #24 awg and have 9 foot (2.7 meters) flying
leads. An LED on the sensor illuminates to indicate a
change in state.
Suggested Sequence of Operation (See
page 17).
• The Valve Inputs are listed in F
• The Valve Outputs (supplied by others) consisting
of two power valves or one dual power valve [Sole-
noid-Close Spool Valve/RETract (Green Tube 1/4
in. OD) and Solenoid-Open Spool Valve/EXTend
(Yellow Tube 1/4 in.OD)]. Connect each Quick Dis-
connect (5/16-24 fitting) to respective power valve
port.
• Other needed Input would include some type of
Start device (Foot Switch or Control Box) (supplied
by others)
1. Home (Reload) Position
a. Solenoid-Close Spool Valve/RETract is acti-
vated.
b. Solenoid-Open Spool Valve/EXTend is deacti-
vated.
c. PX-EXT and PX-CSV signal have been made.
d. PX-RET and PX-OSV signal is not made.
e. Metering Rod is Retracted.
2. Shot Procedure
a. Start device signal is made.
b. Solenoid-Close Spool Valve/RETract is deacti-
vated.
c. Solenoid-Open Spool Valve/EXTend is acti-
vated.
Grounding
. 8, page 20.
IG
7