Magnum Venus Plastech INNOVATOR II CONTROL UNIT - Manual (Page 17)

INSTALATION/OPERATIONS MANUAL
INNOVATOR II
MAGNUM VENUS PLASTECH REV 1.40
MAY 2012 PAGE 17
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 mold 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 adjustable preset time is exceeded, an audible alarm will sound
and the visual RGA indicator (FIG 4.10) 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 accessed on the side 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.
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. Flush cycle cannot be entered while injecting.
CAUTION: Before the flush button is pressed, ensure that the outlet from the mixing head is directed to a suitable
waste container.