What to do if the Top PV displays OPEN on my Despatch PROTOCOL 3 Controller?
If the top PV on your Despatch Controller displays 'OPEN', it indicates that the control thermocouple is either disconnected or broken. To resolve this, repair or replace the thermocouple.
Why does my Despatch PROTOCOL 3 HLPV display OPEN?
If the HLPV on your Despatch Controller displays 'OPEN', this means the high limit thermocouple is either disconnected or broken. You should repair or replace the thermocouple to fix this issue.
What does it mean if the Hi-Limit LED is ON on my Despatch PROTOCOL 3 Controller?
The Hi-Limit LED being ON in your Despatch Controller indicates a problem with the thermocouple or that the Hi-limit setpoint has been exceeded. Once the issue is corrected, press Reset.
How to fix DEV HOLD LED flashing on Despatch PROTOCOL 3 Controller?
The DEV HOLD LED flashing on your Despatch Controller means the oven temperature hasn't entered (or has dropped out of) the Auto Hold band, and the soak timer has stopped. Try programming a slower ramp rate, or if the oven isn't heating, check the heater circuit.
General| Brand | Despatch |
|---|---|
| Model | PROTOCOL 3 |
| Category | Controller |
| Language | English |
Crucial safety and usage guidelines for the controller manual, including copyright and disclaimer notices.
Information about the manufacturer's expertise and available service programs like ASAP.
Explains the structure and content of the user guide, advising users to consult it before seeking assistance.
Defines symbols, signal words (Danger, Warning, Caution, Notice), and typographic conventions used in the manual.
Details on input types (Thermocouple, RTD, Linear), ranges, resolution, impedance, and sensor break detection.
Information on relay and linear DC outputs, their ratings, lifetime, isolation, and accuracy specifications.
Specifies environmental conditions (temperature, humidity) and power requirements for the controller.
Lists compliance standards for EMI, safety considerations (UL, cUL), and front panel sealing (IP rating).
Describes the controller's LCD display type, area dimensions, and character set capabilities.
Details the data recorder's memory, recording interval, capacity, and real-time clock accuracy.
Essential warnings and precautions for operating the controller safely, emphasizing understanding the manual.
Procedures for safely de-energizing the controller before maintenance, ensuring zero energy state.
Guidelines for qualified personnel performing maintenance and repair, stressing power disconnection.
Specific safety precautions for electrical maintenance tasks, warning of shock hazards.
Steps to take in the event of a fire, including de-energizing the machine and using a fire extinguisher.
Reinforces lockout procedures to prevent injury during inspection or repair and ensure equipment safety.
Overview of controller outputs for fans, solenoids, and the ability to operate via PC software.
Explanation of the controller's integrated high-limit protection feature that disables heating when tripped.
Details on standard output signals for data transmission and relay outputs for alarms and events.
Describes how the controller interfaces with PC software for remote control, recipe download, and data logging.
Step-by-step instructions for installing the controller into a panel, including disconnection and reconnection.
Guidance for replacing an older Protocol Plus controller with the newer Protocol 3 controller, detailing connections.
How to configure the controller for communication with PC software using unique addresses and protocols.
Detailed steps for setting up Ethernet communication, including locating and running setup tools.
Instructions for finding and configuring the controller's MAC address, essential for static IP assignment.
Description of keypad switches, LEDs, and screen navigation for operating the controller.
Initial screens displayed upon power-up, including 'Select a Mode' for choosing operating modes.
Steps for creating, editing, and managing temperature profiles for complex heating cycles.
How to start, stop, and clear recordings, and access recorder status information.
Options for interacting with USB devices, including reading/writing files and configurations.
Accessing and navigating the controller's configuration settings for inputs, outputs, alarms, etc.
Options for automatic PID tuning routines (Pre-Tune, Self-Tune, Auto Pre-Tune).
Displays detailed information on the unit's software, hardware, calibration, firmware, and serial number.
Contact details for technical support, sales, and service departments at Despatch.
Overview of remote operation capabilities using Despatch Protocol Manager software.
Configuring external digital inputs for controlling profile execution (Run, Hold, Stop).
Routine maintenance tasks to keep the equipment clean, accessible, and protected from heat.
How to order parts and procedures for returning equipment, including obtaining an RMA number.
Common error messages (Hi-Limit LED, DEV HOLD, PV OPEN) and their possible causes and remedies.
Information on firmware versions and requirements for Protocol Manager software compatibility.
Steps to resolve communication issues between PC software and the controller, checking address, baud rate, and parity.
Information on product warranty terms and availability, with links to online documents.
Where to find replacement part drawings and online ordering information for Despatch ovens.
Information on obtaining mechanical outline drawings, typically shipped with the oven.
Information on obtaining electrical schematic diagrams, typically shipped with the oven.
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