Graco PR70 Manual De Usuario

312393G 

 

17 of 50 

6.  Place an empty container on a scale, and tare 

(zero) the scale.  Repeat the process with a 2

nd

 

container on a 2

nd

 scale. 

7.  Place both containers under the ratio check nozzle, 

positioned so one container captures material A, 
and the 2

nd

 container captures material B.   

8.  Press the footswitch. 

9.  After the material is dispensed, place each 

container on the same scale, and measure the net 
mass of each of the materials.  Record the mass of 
both the A and B materials. 

10.  Divide the A material mass by the B material mass 

to obtain the material ratio being dispensed. 

 
 

The following sections outline how to configure various 
optional settings. 

The user can control the machine’s piston position and 
displacement valve operation manually the M1 screen.  

From the Run Screen press 

 then press 

.  The 

following screen will be displayed.

 

 

Key: 
A  Full Retract ICON 
B  Full Extend ICON  
C  Change Dispense Valve Mode 
 

 = Always Open 

 

 = Always Closed 

 

 = Opens at Cylinder Entrance (Automatic) 

D  Current Piston Position 
E  Current Dispense Valve Mode 
F  Screen Number (C1) 
G 

 & 

 keys will navigate to adjacent screens. 

1. Press   to extend the piston. 

2. Press   to retract the piston. 

1.  To change the DV operation press the third blue 

key from the left. 

2.  When the Current Dispense Valve Mode (E in 

Figure 17) is 

, the valve will open and stay open 

regardless of the piston position. 

3.  When the Current Dispense Valve Mode is 

, the 

valve will close and stay closed regardless of the 
piston position. 

4.  When the Current Dispense Valve Mode is 

, the 

valve will be in automatic mode, opening when the 
pump gets to the cylinder entrance and closing 
when it gets to the end of the cylinder. 

5. Press   twice to return to the Run screen. 

When activate, the Purge Timer will automatically 
dispense a shot if the machine is idle (not dispensing 
material) for a programmed duration of time.  This 
prevents the mixed material from hardening in the 
static mixer.  To set the Purge Timer; 

From the Run screen, press 

, then press 

, and then 

press 

 once.  The following screen will be displayed. 

 

1. Press  . 

2. Press   or 

 to enter the purge timer value.  

This idle time allowed before the machine will 
automatically dispense a shot to clear the mixer.