Magnum Venus Plastech PVSensor User Manual

PVSensor

Complete System # 5801

Procedure for Installation and Use

The PVSensor (PVS) system is designed to safely optimise LRTM or RTM mould fill. It is now possible to
monitor and control the in-mould pressure from 800mb to 2000mb. (The short term, safe over-pressure is
rated at 3 bar).

The system comprises:

• Electronic Display Module # 5798 – Operator controls and status LED

• Power Supply Unit # 5799 - 240/110vAC input, 12vDC output

• PVSensor # 5797 - A PTFE bodied precision electronic pressure sensor to fit a mould insert.

• Machine Control # 5789 - Output solenoid to control the resin flow of meter mix machinery.

Kit contains complete mounting bracket set and conversion fittings for Patriot SSB and
Megaject MkIV / MkV machines.

• Universal Insert with spring Clip # 6316, and Adapter # 6317

ELECTRONIC DISPLAY MODULE AND POWER PACK:

The Electronic Module houses the circuitry that manages the signal from the PVSensor and allows the
setting of the required mould pressure set-point and hysterisis. It also provides Actual Pressure readings
from the sensor in the mb range. The scale is x 10, as individual millibar changes would be too rapid and
confusing to read. Therefore a reading of 101 is actually 1010 mb (101 x 10).

Electronic Module & Trimmer tool

PVSensor
Socket

Power Supply Unit ( PSU )

PVS
Dummy
Plug

Machine control
lead

Universal Mould Insert,
Spring Clip and adapter

PVSensor

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RETRO FITTING THE ELECTRONIC MODULE TO YOUR MACHINE:

1.

2.

-

Retro Mounting Kit

.

1

2

If your PVSensor system was not factory fitted you will need to fit the mounting bracket and make some
minor changes to the machine’s air circuit. The PVSensor is supplied complete with, Machine Control
Solenoid Valve assembly # 5789, and fixing bracket, spacers and screws to mount the Electronic Module
to the SSB chassis, or the Megaject Cabinet. See Appendix A.1, A.2 and A.3 for full instructions.

Machine Control solenoid assembly # 5789 includes:

- Solenoid Socket.

- Solenoid Valve & silencer with mounting screws to SSB or MkIV / MkV.

- 6mm clear nylon pipe with Tee and stud fittings for SSB connection.

- 4mm red nylon pipe with Tee and stud fittings for MkIV & MkV connection.

Retro Mounting Kit includes:

Mounting Bracket, 4 x Bolts and
2 x Spacers.

CONNECTING THE ELECTRONIC MODULE TO THE MACHINE:

 With the power switched OFF, connect the 12vDC PSU to the socket on the left hand end of the

Electronic Module.

 Connect the 3 way, black socket to the injection machine plug now fitted as standard on all

standard Magnum Venus Plastech meter mix machines.

 This plug can be found flush mounted on the side of older Megaject SSB model chassis, on the

rear of Patriot SSB chassis, or on the back of the yellow Megaject MkIV and MkV machine
cabinets.

 Switch the power ON, and assuming the mould is not under vacuum supply, the atmospheric

pressure on the electronic display screen should read between 95 and 105 (950 to 1050 mb),
dependent upon weather conditions.

SETTING UP THE ELECTRONIC MODULE:

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 For the PVSensor system to operate, the Electronic Module must be connected to the machine via

the Machine Control Solenoid Valve assembly.

 Whilst pressing, and holding in the left hand button on the Electronic Module, adjust the right hand

knob to select the desired set-point value (at which the operator is to be warned that the maximum
set pressure has been reached). This should be about 10-20 mb BELOW atmospheric pressure.
E.g. If atmospheric pressure reads 100 on the digital display (1000 mb) then set the control unit
pressure (when pressing the left hand button) to read 99 or 98. (990 or 980 mb). If this pressure
setting in the mould is reached during injection the system will send a signal to the machine to
slow down the injection rate or stop the machine.

 The PVSensor set-point cannot be adjusted when the output solenoid is energized. (LED is on).

Green LED

Electronic Module Controls

Hysterisis Adjustment
– use Trimmer tool

Set-point
adjustment

LCD Display x 10mb

OPERATING THE PVSENSOR:

 The resin pressure within the mould will be continuously monitored and once the set-point has

been reached a green LED will illuminate on the left hand side of the unit. This also provides a
signal to the Machine Control solenoid valve mounted within the machine.

 This signal will reduce the flow of resin to the mould by slowing the machine, or stopping it all

together, so that the mould’s internal pressure does not exceed the set-point. Once the pressure
drops back the machine will automatically speed up, or start again.

 Once the set-point has been reached and the solenoid energized to stop the machine (LED on),

the pressure must fall by a given amount (Hysterisis) before the unit restarts the machine. This
prevents the system from continuously starting and stopping the machine as the mould pressure
moves around the set-point (hunting). The Hysterisis is factory set and should not be adjusted
under normal circumstances.

POSITIONING AND FITTING THE SENSOR IN THE MOULD:

 In LRTM moulds, the Sensor should be positioned in the resin feed channel using a mould insert

that is positioned between 300mm and 600mm from the resin input point.

 For infusion applications this should be between 100mm and 200mm. If the PVS unit is to be

used solely to sense the mould pressure and not to control the machine, then the Sensor can be
sited anywhere in the mould using the Film Infusion Extension option # 5885.

 It is important that the Sensor’s mould insert is installed in a vertical, or near to vertical position on

the mould’s upper (back) tool. NOTE: The Sensor is not designed to work if it is installed off
vertical by more than 30º and must not be installed, or used, inverted.

NOTE:
Injection Autosprue positioned
in the peripheral resin feed
channel.

The PVSensor positioned no
more than 600mm away from
the injection point.

PVSensor mounted vertically on upper (back) LRTM tool.

PVSensor Instruction Manual. Issue-08 25/06/2008 Page 3 of 8