Shot/Flow Setup 1 - Graco PR70 Operation & Maintenance Manual

Shot/Flow Setup 1

Icon Description
Picks the operating mode for the pumps. Off Mode disables the pumps. Pressure Mode allows the
pumps to cycle within a pressure window to deliver a defined shot size at a defined flow rate. Shot
Mode allows the pumps dispense a defined shot size at a defined flow rate. Continuous Mode allows
the pumps to cycle continuously at a defined flow rate. Operator Mode lets the operator determine the
shot size by how long the start device is actuated at a defined flow rate. In operator mode, the pumps
must be retracted with an external customer signal or the "Home" push button.
If the system is equipped with a dispense valve, this sets the mode that it will operate. Open Mode
holds the dispense valve open. Close Mode holds the valve closed. Auto Mode opens the valve when
the pumps are dispensing and closed the valve when the pumps are done. Note cycling the pumps
with the dispense valve in Close Mode and no other valves open will cause the servo motor to stall
and fault.
If the system is equipped with a pressure transducer, this displays the current material pressure at the
outlet.
If the system is equipped with a pressure transducer and the pump mode is set to Pressure Mode,
these values determine when the pumps will stop and start. If the High Limit is set at 100psi and the
Low Limit is set at 50psi, the pumps will cycle until the pressure reaches 100psi and stop. The pres-
sure will drift down and when it gets to 50psi the pumps will start up again. This repeats until the value
in the shot size is reached. Units are pounds per square inch (psi).
This sets the shot size (cc's) and flow rate (cc's/sec) for ten programmed shots. Push the button on
the left of the values to pick the shot to dispense. The push button will change green to indicate the
chosen shot/flow rate. Push the shot size or flow rate field to change the value.
This is used to send the pumps to the home position. Note the home position is the point in the dis-
pense cycle when the pistons begin metering material.
The top row shows how many total strokes the pumps will take to get the user entered shot size. The
bottom row shows how many strokes have been taken as the pumps cycle.
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