Graco 3A2098H important safety instructions Static Precharge Mode, Dynamic Precharge Modes

Precharge Modes

NOTE: See the diagram on the following page.

Static Precharge Mode

Display

When Display precharge mode is selected, a static pre- charge pressure can be defined. When a job is active and all dispense valves are closed, the regulator will maintain the defined precharge pressure.

Dynamic Precharge Modes

Dynamic precharge control allows the system to better prepare for the upcoming dispense. The pressure/flow command is used to actively set the outlet pressure to the ideal pressure while all dispense valves are closed and provide a boost while the valve is opening to help accelerate material.

The “Closed” scaling will be applied when all dispense valves are closed and the “Opening” scaling will be applied immediately after a dispense valve starts to open and continue for the user-specified duration (in milliseconds). The precharge scaling values modify the control signals that are necessary to obtain the desired pressure/flow. The precharge pressure can be changed dynamically throughout the job by varying the pres- sure/flow command value.

Valve 1

When the “Valve 1” precharge mode is selected, the outlet pressure will be set according to the current pres- sure/flow command using Valve 1 scaling values.

Operation

Gateway

NOTE: Gateway precharge mode is only available for systems containing CGMs.

When “Gateway” precharge mode is selected, the outlet pressure will be set according to the current pres- sure/flow command using the scaling set for dispense valve(s) selected through the gateway interface.

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