Despatch Protocol Manager with Protocol 3 and Protocol Plus - Manual (Page 10)

T HEORY OF O PERATION Protocol Manager Instruction Manual
10 Version 1
Copyright © 2013 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
2.3. The Protocol Plus Controller
The Protocol Plus controller provides outputs for the cooling fan, door lock switch/door release
pushbutton, and optional beacon light. As many as eight profiles for oven heating cycles are
stored in the Protocol Plus controller. Access profiles using the Protocol Plus keypad.
The Protocol Plus controls the solenoid valves in an inert atmosphere oven for purge and to
maintain operation. The Protocol Plus controller has an integrated high limit function which
disables the heater output when tripped.
The Protocol Plus controller has two displays. A dedicated LED upper display shows the
oven temperature (Figure 4). A two line LCD lower display provides information on control
status, high limit temperature and allows changes to be made to the control settings. Figure 3
shows a schematic of the Protocol Plus face plate.
Figure 2. Protocol 3 Operator Interface.