MVP Patriot Megaject Innovator II, Operation Manual

Page: 23 / 78

Patriot Megaject Innovator II Operations Manual
Rev. 04/2014 Page | 23
Flush:
Press the flush button to clean the injection head. The operator cannot initiate a flush
when the machine is in injection mode, therefore accidental flushing of the system into a
mold during an injection is not possible.
The flush system has an automatic timer function that will stop the flush cycle
automatically. The default duration of the flush is set between 30-60 seconds during
manufacture; however this can be adjusted by the user if required.
The flush cycle can be stopped at any time by pressing the stop button.
CAUTION: Before the flush button is pressed, ensure that the outlet from the
mixing head is directed to a suitable waste container.
Mold Pressure Guard (MPG):
The machine features a Mold Pressure Guard (MPG), which is used to control the
maximum allowable pressure at the mixing head. This can be utilized to provide line
pressure control during an injection, or as a safety mechanism to prevent the line
pressure from exceeding the maximum working pressure of the injection line to the
mold.
The MPG block is supplied with 2 air lines. One air-
line supplies air from the MPG pressure regulator on
the control panel. The other is connected to an
internal circuit on the control box.
When fluid pressure at the injection head exceeds the
MPG preset level, shown on the MPG pressure
gauge, the internal diaphragm moves the MPG piston
outward and leaks air from the line connected to the
control circuit.
As the level/flow of air pressure is reduced by the
MPG the piloted regulator, the supply pressure to the
pump is reduced, in effect slowing it down. Once the
air pressure in the control circuit has dropped below approximately 15 psi, the pump will
shut off. In the case of the Pro gun configuration, the gun will also close. Once the
pressure has been restored, either by fluid being drawn into the mold, recirculation
engaged or blockage cleared from output line, the system will start up again.
NOTE: The MPG control is active in recirculation or injection mode. It is normal to
hear air leaking from the MPG block when the MPG is operational.