Maintenance Mode Operation - Graco PCF Instructions - Parts Manual

Operation

Maintenance Mode Operation

Operating from maintenance mode enables the module
to begin dispensing when the user presses
pense parameters and duration depend on the selected
control. Dispensing continues for as long as
pressed.
Verify System Operation
Use maintenance mode to manually check the operation
of the PCF system components before switching over to
automation control (normal operation). See Dispense
From Maintenance Screen, page 36, for instructions
on operating from maintenance mode.
NOTE: Perform any of the following procedures
while in maintenance mode.
Set Inlet Pressure
The inlet pressure reading should be in the range of 300
psi (2.1 MPa, 21 bar) to 500 psi (3.4 MPa, 34 bar) above
the outlet pressure reading under your highest flow con-
dition.
Follow steps in the supply system manual to set the inlet
pressure.
NOTICE
Excessive inlet pressure will cause accelerated wear
on the regulating valve and the pump feed system.
Feed System Pressure Drop
During material flow, the regulator inlet pressure
decreases. The amount the pressure decreases is the
amount of pressure lost between the feed pump and the
regulator inlet.
With high viscosity fluids, long line lengths, or small
diameter line sizes this pressure decrease can be thou-
sands of psi (hundreds of bar). This means that the
static pump pressure is set much higher than the regula-
tor needs at its inlet. To prevent excessive control regu-
lator wear or surging, a mastic fluid pressure regulator is
recommended on the feed line close to the control regu-
lator. The mastic regulator will suppress the static feed
pressure at the control regulator inlet.
34
Dispense from Each Gun
Dispense from each gun that will be used in normal
operation to confirm that the entire system is installed
correctly and is capable of delivering desired results.
. Dis-
Follow the steps outlined in Dispense From Mainte-
nance Screen, page 36, to perform each of the follow-
ing applicable system verification checks.
is
• For each gun that will be used during normal opera-
tion, dispense at each pressure or flow rate that will
be used during normal operation. This verification
check confirms that the system is capable of deliver-
ing material at a maximum desired operating point.
• For systems that will operate multiple guns in pres-
sure mode at the same time, dispense from each
gun at the same time. This verification check con-
firms that the system is capable of delivering mate-
rial at a maximum desired operating point.
• For each gun operating in bead mode, perform an
initial teaching process. Follow this procedure after
significant system and/or material characteristic
changes.
a. For each flow rate that will be used during nor-
mal operation, press
the flow rate setpoint.
NOTE: During the initial system operation verifica-
tion, it may take four to five seconds for the system
to learn system characteristics.
b. Continue to press
after the desire flow rate is reached to confirm
that the system is capable of maintaining the
desired flow rate.
c. Repeat Steps a and b for a range of flow rates
to confirm that the system responds quickly to
achieve setpoint when
until PCF achieves
for several seconds
is pressed.
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