Despatch Protocol Plus Controller (Heat/Cool) Manuel d'utilisateur télécharger pdf (Page 7)

INTRODUCTION

The special features of the Protocol Plus

control include:

• PID tuning

• Ramp/Soak programming of up to 64 segments

• Segment looping and profile linking

• Built-in manual reset high limit control

• Built-in process timer

• Dedicated LED display for process temperature

• Multi-purpose two-line LCD display with backlight

• Auto-tuning

• Security access

• Digital inputs for remote profile control

• Optional relay outputs for events, alarms, or end-of-cycle signal

• Optional real-time-clock

•

Optional RS232/RS422/RS485 MODBUS communications

Theory of Control Operation

The Protocol Plus is a modular microprocessor based digital temperature controller. The

Protocol Plus 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.

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Despatch Protocol Plus Controller (Heat/Cool) Manuel d'utilisateur Page 7