Magnum Venus Plastech Megaject RTM Pro Revison 7_0 - Manual (Page 19)

Megaject RTM Pro Manual – Revision 7.00 – 13
th
APRIL 2006
3.4. Recirculation
Recirculation of the machine should be carried out on a regular basis to ensure resin
and catalyst flows are even, free of air bubbles (observed through recirculation
returns) and to prevent if used, sedimentation of any fillers/additives in the resin
system.
Recirculation should be carried out at the start of each shift or if new material has
been added to either the resin or catalyst containers.
NOTE: Unnecessary and excessive use of recirculation will result in unnecessary
pump seal wear.
The recirculation screen shown in Figure 3.0, can be reached by pressing the
RECIRCULATION button on the main menu screen.
Figure 3.0 – Recirculation screen
It is possible for the user to set the on and off durations during a recirculation cycle, in
addition to the rate at which the pumps operate.
Change the recirculation on and off times by pressing the appropriate button, and then
entering the required value on the numeric input.
The recirculation rate can also be modified, and represents the percentage of air
pressure supplied to the air cylinder. The maximum amount of pressure available is
determined by the recirculation configuration (see section 4.1 for more information).
These settings will be dependent on the viscosity of the resin being used as well as the
desired circulation rate. The higher the recirculation rate % is set, the faster the pumps
will recirculate.
To begin recirculation, press the START button. Before the machine starts, the
machine will operate the sounder beacon as a warning.
The Catal bar at the right hand side of the screen ranges from 0-100%, and should be
used in addition to visual checks to ensure catalyst is flowing correctly. The bar
should rise for each stroke of the pump, and fall momentarily at the end of a stroke.