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PCP Series Manual Revision B / October 2021 Page 12 of 56 Fluid Pressure The resistance of flow through the dispense needle have an effect on the outl et fluid pressure. The size of the static m ixer and dispense needle,…

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PCP Series Manual
Revision B / October 2021
Operation
WARNING: Never operate the pump dry. If the pump is operated dry or without pump
conditioner, severe damage will occur. Always apply lubricant to the rotor before the
pump is assembled.
Operation Notes:
• You must do the initial bleed for the pump to function correctly.
• Make sure the material is supplied correctly to the pump.
The sections that follow are in the recommended order to operate the pump. To operate
the pump, do every sub-section in Section 3, in the order shown.
Bleed the Pump
1. Open the bleed clip.
2. Turn the bleed clip counterclockwise to loosen. Turn one full rotation then slowly
until material appears.
3. Turn one full rotation and then slowly until the material begins to bleed.
4. Let the material flow from the material outlets until there are no breaks in the
material flow.
NOTE: Any break in the flow of the material shows there is still air in the system.
Bleed the pump until the material flows smoothly without any breaks in the flow.
NOTE: The fluid supply operating pressure must be have a flow rate equal to or more
than the maximum flow rate capacity of the pump.
5. Clean all material from the manifold and material outlets.
6. Close the bleed clip by spinning it clockwise until there is resistance.
7. Close the door of the bleed clip.
PCP Series Manual
Revision B / October 2021
Fluid Pressure
The resistance of flow through the dispense needle have an effect on the outlet fluid
pressure. The size of the static mixer and dispense needle, the viscosities of the fluids, and
the flow rate also all have an effect on the outlet fluid pressure.
• The maximum outlet fluid pressure is 285 psi.
Material Flow Rate
Material flow rate can be adjusted in Auto Cycle or Manual mode through PVA Portal. Refer
to the Portal instructions in your workcell manual. An alternative is to adjust the path
speed in PathMaster instead of material flow rate. Refer to your PathMaster manual.
Install the Needle
After the system has been bled, you must install the needle.
1. Push the needle up and twist to attach it.
2. Use the purge function to release all air from the needle.
Snuff Back
The “snuff back” function prevents strings or drips of material at needle tip after material is
dispensed. Snuff back is the when the pump operates in the opposite direction for a short
period and causes the material to flow in the opposite direction also. Snuff back removes
the fluid pressure from the static mixer and needle to stop strings or drips at the needle tip.
WARNING: Snuff back makes the pumps operate in the opposite direction and it is
possible that mixed material from the static mixer is pulled back into the pumps. Use
the minimum snuff back or material will cure in the pump.
1. Use PVA portal to adjust the snuff back time for your application.
2. If the needle tip drips or has strings of material when the valve is closed, increase
snuff back.
3. If material cures in the pump assembly, decrease snuff back.
4. Contact PVA for additional information on snuff back adjustment.
PCP Series Manual
Revision B / October 2021
Pump Shutdown Procedure
1. Remove the needle from the manifold.
2. Purge material through the manifold.
3. Completely clean the manifold material outlet.
4. Install a night cap on the manifold material outlet.
5. Release the fluid supply pressure. Refer to the workcell manual if necessary.