Magnum Venus Plastech INNOVATOR MEGAJECT 5000 (8001) - Manual (Page 23)

MAGNUM VENUS PLASTECH Innovator Megaject Manual 23
RGA (Resin Gel Alarm)
The machine features a RGA (Resin Gel Alarm) system, designed to alert the
operator to the risk of catalyzed resin curing in the machine or mould during an
injection or prior the machine being flushed and cleaned.
When the inject button is pressed and the machine starts in injection mode, the
RGA becomes active. It monitors the time between pump strokes during an
injection and if the user-settable preset time is exceeded, an audible alarm will
sound and the visual RGA indicator on the control panel will change from black to
red.
The alarm is reset when the pump stroke changes direction in injection mode,
however in this case the RGA will continue to monitor the pump strokes and will
alarm again if the preset time between pump strokes is once again exceeded.
An example of this would be if the machine stalled during an injection due to a
higher than normal back-pressure in the injection line. The operator may increase
the injection pressure to make the pump stroke and therefore reset the alarm and
complete the injection.
The RGA is de-activated, so that it stops monitoring pump strokes and cancels
any active visual/audible alarms, by either flushing the machine or pressing the
RGA reset button.
The RGA reset button is hidden on the back of the control panel and can be
pressed by inserting a small screwdriver or equivalent through the hole marked
RGA reset. This is not intended to be used in normal operation and is provided
as a means to silence the alarm, if the pump cannot run and the machine cannot
be flushed.
A user configurable pneumatic timer, which can be adjusted between 20-300
seconds (0.3 – 5 minutes) is located in the control box. In addition, a factory set
timer of between 30-60 seconds is included in the RGA circuit to limit the
switching rate of the circuit. These two timers need to time-out in sequence in
order for the alarm to trigger. In practice if the mechanical timer is set to 5
minutes, if the duration of a pump stroke was to exceed around 5.5 – 6 minutes
during an injection, the alarm would trigger.
Guard Interlocks
If the machine is fitted with a slave arm guard that does not require a tool to open,
the guard will be fitted with an interlock to stop the pump running when it is opened.
In this case, if the guard is open, or not correctly closed, the machine will not
operate in injection or recirculation modes. Opening the guard while the pump is
operating will have the same effect as pressing the stop button.