Maintenance Mode Operation - Graco PCF Instructions 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 40, for instructions
on operating from maintenance mode.
NOTE: Perform 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 condition.
Follow steps in the supply system manual to set the inlet
pressure.
NOTICE
Inlet pressure beyond the recommended range
above 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.
38
Dispense from Each Valve
Dispense from each valve 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 40, to perform each of the follow-
is
ing applicable system verification checks.
NOTE: Each fluid plate controls only the dispense
valves connected to it.
• For each valve that will be used during normal oper-
ation, dispense at each pressure or flow rate that
will be used during normal operation. This verifica-
tion check confirms that the system is capable of
delivering material at your maximum desired operat-
ing point.
• For systems that will operate multiple valves in pres-
sure mode at the same time, dispense from each
valve at the same time. This verification check con-
firms that the system is capable of delivering mate-
rial at your maximum desired operating point.
• For each valve 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.
3A2098A