Despatch LBB2-xxA/B-2 - Manual (Page 23)

LBB Series Oven Owner’s Manual T HEORY OF O PERATION
Version 18 23
Figure 6. Protocol 3 Operator Interface.
Features
Description
Increases a setpoint or mode parameter
Decreases a setpoint or mode parameter
Reset the High Limit, return to normal display
3.2.2.1. Product High Limit Instrument
If the product being processed has a critical high temperature limit, use the High Limit instrument
as a product High Limit instrument. Set the High Limit instrument to a temperature somewhat
below the temperature at which the product could be damaged.
3.2.2.2. Oven High Limit Instrument
If the product being processed does not have a critical high temperature limit, use the High Limit
as an oven High Limit instrument to protect the oven equipment. Set the High Limit to 204°C.
3.3. The Protocol 3 Controller (Optional)
The Protocol 3™ controller is a microprocessor based digital temperature controller designed for
simple and flexible oven operation (Figure 6). 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.