Despatch LBB2-xxA/B-1 - Manual (Page 23)

LBB Series Oven Owner’s Manual
T HEORY OF O PERATION
Version 15 23
Copyright © 2012 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.
Figure 5. Protocol 3 Operator Interface.
Table 2. Control Instrument Explanations.
3.3. The Protocol 3 Controller
The Protocol 3™ controller is a microprocessor based digital temperature controller designed for
simple and flexible oven operation (Figure 5). The Protocol 3 controller operates as a dual-
functioning controller/High Limit instrument. The control portion utilizes a time proportioning
voltage signal to control heating devices with minimal temperature fluctuations.
The High Limit portion protects the
product and/or the oven from
overheating. If the product being
processed has a critical high
temperature limit, the High Limit
setpoint should be set to a
temperature somewhat below the
temperature at which the product
could be damaged. If the product
does not have a critical high
temperature limit, the High Limit
setpoint should be set 5 to 15 degrees
higher than the maximum
programmed setpoint at which the oven
will operate.
The Protocol 3 controller provides three primary operating modes:
 Manual: Oven operates continuously at a fixed temperature until turned off.
 Timer: Oven operates at a fixed temperature for a user-selected time period, and then
automatically turns off.
 Profile: Temperatures increase or decrease as defined by 255 segments that can be allocated
to 64 ramp and soak profiles. The profiles can be linked to provide additional temperature
combinations.
Review the Protocol 3 Controller Owner’s Manual for more information.
Display Description
Main (PV) Display Typically displays actual oven temperature. Press
SET/ENT
to display
setpoint. Displays parameter code and value.
Key
Press to switch between PV and SP displays. Enter data using or . Press
repeatedly to switches through parameter displays.
Decrease setpoint or mode parameter
Increase setpoint or mode parameter
SP Lit when setpoint value displays
OUT Lit when control calls for heat
AL1 –2 N/A