Magnum Venus Plastech Flex Molding Process MKVI Mix - Manual (Page 59)

MKVI Mix Meter System Operations Manual
Rev. 08/2013 Page | 59
Accessories:
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.