Despatch Protocol Controller - Manual (Page 8)

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Figure 2. Main Display and Keypad on Protocol Control
THEORY OF OPERATION
This section describes the Protocol installed in the LAC, LAD, LFD and LND Series
ovens.
Protocol
The ovens are equipped with a modular microprocessor based digital temperature
controller.
The Despatch Protocol temperature controller is a dual functioning controller/high limit
instrument. The control portion of Protocol incorporates a microprocessor to digitally
control process variables with minimal temperature fluctuations.
The high limit portion of Protocol protects the product and/or the oven itself. If the
product being processed has a critical high temperature limit, the Hi-Limit parameter
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 Hi-
Limit parameter should be set to a value slightly higher than the highest programmed
setpoint to protect the oven equipment.