Precisionflo Xl Module Overview - Graco PrecisionFlo XL Manual

PrecisionFlo XL Module Overview

The block diagram in Fig. 4 shows an example of the
PrecisionFlo XL module.
The fluid metering assembly contains the components
that control and monitor fluid dispensing. It can be
attached to a robot arm or mounted on a pedestal.
The control assembly sends continuous voltage sig-
nals to the PrecisionFlo metering valve to control
opening and closing of the metering valve.
The control assembly receives input from the robot
controller, user-programmed values, and components
on the fluid metering assembly. The control assembly
uses this input to determine the signal it should send to
the controller.
Robot Controller
Temperature Fault (from optional conditioning system)
PrecisionFlo XL
Fluid Metering Assembly
Fig. 4
8 309375
The PrecisionFlo XL metering valves are electrically
controlled by the PrecisionFlo XL module, and consis-
tent material flow is assured by a closed–loop pressure
or closed–loop flow control design. The module re-
sponds to robot–supplied signals to provide an accu-
rate and consistent output flow based on a comparison
of actual to desired flow rates. The electric regulator
has a needle directly connected to the motor shaft,
yielding nearly instantaneous adjustments to the
material flow rate, while the pneumatic regulator uses
air pressure to control fluid pressure and to provide
fast response to electronic commands and ensure a
precisely controlled, continuous flow of material.
Dispense
Measure Volume
Style Bits 1, 2, 4, 8, 16
Volume Request
Fault Acknowledge
Flow Command
Fault Strobe
Dispenser Ready
Data Bus 16 bit
Volume Valid
Gun On
V/P Closer Signal
Flow Meter
Outlet Pressure
Inlet Pressure
PrecisionFlo XL
Control Assembly
PrecisionFlo XL
Control Assembly