Despatch Stackable LCC/LCD-4 - Manual (Page 16)

T HEORY OF O PERATION Stackable LCC/LCD Oven Owner’s Manual
16 Version 1.1
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.
ductwork may be easily removed for cleaning. Heater frame, fan wheel and motor shaft are
constructed of stainless steel.
Two electropolished stainless steel wire shelves are provided. The shelves are removable and
adjustable on two inch centers.
The LCC/LCD series design offers a stackable oven body. Multiple oven systems of two or three
oven stack options are available. When operating multiple ovens, network the Despatch Protocol
3 controllers together with a Modbus communication option. Use the optional Despatch Protocol
Manager software to enable customer PC control of multiple ovens.
3.2. The Protocol 3 Controller
The Protocol 3 is a microprocessor based digital temperature controller designed for simple and
flexible oven operation (Figure 2). 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.

Stackable units are available in air or nitrogen atmosphere models.
Nitrogen atmosphere models are noted with an N suffix. Model
numbers beginning with “LL*1-*” do not use a HEPA filter.
Figure 2. Protocol 3 Operator Interface.