Maintenance Mode Operation

Fluid Plate

Swirl

Maintenance Screen

Maintenance Screen

Operating from maintenance mode enables manual

dispensing () and manually starting the swirl dis-

penser ().

The system begins dispensing when the user presses

. Dispense parameters and duration depend on the selected control. Dispensing continues for as long

as is pressed.

The system starts the swirl dispenser when the user

presses . The swirl dispenser continues to run until is pressed again.

There is one maintenance screen for each installed fluid plate and each installed Swirl. The maintenance con- trols for the Swirl are shown on both the Swirl mainte- nance screen and on the Fluid Plate maintenance screen for the fluid plate where the swirl dispenser is installed.

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 43, for instructions on operating from maintenance mode.

NOTE: Perform the following procedures while in main- tenance 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.

Operation

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.

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Graco 3A2098H Maintenance Mode Operation, Verify System Operation, Set Inlet Pressure, Feed System Pressure Drop