Graco LSR Select, Инструкция по эксплуатации

Страница: 23 / 112

Operation
3A2152B 23
System Calibration Procedure
Perform this entire procedure if any of the following con-
ditions are met:
• The machine is new.
• The materials in the system have been
changed.
Software Settings:
1. Go to the AUTO MODE SETUP screen.
2. Enter the flow rate and ratio percentages.
3. Go to the DRIVE/VALVE SETUP screen.
4. ENABLE ALL the drives.
5. HOME the pumps of they are not home.
Prime the Machine:
1. Press the footswitch or give a maintained signal
from the press to begin pumping.
2. After dispensing close to a full shot, release the
footswitch or signal from the press and let the
pumps reload.
3. Repeat this until air-free material is dispensed.
4. Repeat around fifteen more times to ensure the new
mix of material has traveled through the mixer.
5. Connect the mixer to the customer supplied screw
inlet valve.
6. Repeat more shots until air free material is dis-
pensed out of the screw.
Balancing the pump pressure:
The key to getting consistent ratios is to dispense at
roughly the same pressure as the pumps are being fed
from the feed system. The screen below shows all pres-
sures.
NOTE: Pressures can only viewed if kit 24M127 is
installed.
The blue line is the base pump pressure. The pressure
is around 500 psi (3.4 MPa, 35 bar) when done loading.
The dispense pressure is around
400 psi (2.8 MPa, 28 bar). These two pressures are
close enough to give repeatable shots. They could be
even closer by adjusting the feed pump air pressure
down until the material pressure is
400 psi (2.8 MPa, 28 bar). If the reload pressure of the
base was 800 psi (5.6 MPa, 55 bar) and the dispense
pressure was around 200 psi (1.4 MPa, 14 bar), the dis-
pense would not be repeatable.
The red line is the inhibitor. The inhibitor is balanced,
the load pressure is a little under 400 psi (2.8 MPa,
28 bar) and the dispense pressure is almost the same.
In this particular screen, only base and inhibitor are
being dispensed. The green line is the catalyst and
always is reading the load pressure, right around
400 psi (2.8 MPa, 28 bar).
If the transducer kit (24M127) isn't used, the base pres-
sure is all that can be monitored. The pressure of the
inhibitor and catalyst can be estimated by looking at the
base pressure at dispense and setting the air pressure
in the feed pumps for the inhibitor and catalyst so the
material pressure of them is similar to the base. The air
pressure multiplied by the feed pump power factor is
roughly the material pressure.
NOTICE
After the catalyst has been added, the material is
able to cure. To avoid machine damage from long
idle times, perform a
Base Purge , page 19.
Start
Disp. End
Disp.
Pumps
Reload