Magnum Venus Plastech INNOVATOR PRO 5000 (8003) - Manual (Page 26)

MAGNUM VENUS PLASTECH Innovator Pro Manual 26
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 to 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.
RGA Adjustment – The time between strokes permitted to pass before the RGA
alarms and the volume of the alarm whistle can be adjusted by the user.
The pneumatic RGA is located in the lid of the control box, behind the
predetermining counter. The mechanical timer is shown in figure 6. Turn the knob
to adjust the timer to the required time, between 20 – 300 seconds. The dial
shows seconds divided by 10, therefore to set the timer to 100 seconds, adjust
the dial to 10.