Product Overview

The Triconex 3806E is a high-current analog output module for critical safety systems. This module uses Triple Modular Redundant (TMR) architecture for maximum fault tolerance. The Triconex 3806E receives output signals from the main processor on three separate channels. Each set of data is voted internally, and a healthy channel drives the field outputs. The module monitors its own current outputs as input voltages. An internal voltage reference provides self-calibration and health information. The Triconex 3806E is specifically optimized for turbomachinery applications like compressors and turbines. Each output module requires a separate external termination panel (ETP) with a cable to the Tricon backplane.

Technical Specifications

The Triconex 3806E delivers precise current control with two distinct output ranges. Below are the detailed technical parameters.

General Features

• Type: TMR (Triple Modular Redundant)

• Number of output points: 8 total (6 points at 4-20 mA, 2 points at 20-320 mA)

• Isolated points: No, commoned return, DC coupled

• Resolution: 12 bits

• Hot-spare capability: Yes, supports online module replacement

Output Accuracy

• Less than 0.25% of FSR for the 4-20 mA range

• Full scale ranges: 0-21.2 mA and 0-339.2 mA

• Measured from 32°F to 140°F (0°C to 60°C)

External Loop Power

• +42.5 VDC maximum

• +24 VDC nominal

• Reverse voltage protected for safety

Maximum Load at 4-20 mA Range

• 20 VDC external: Up to 275 Ohms

• 24 VDC external: Up to 475 Ohms

• 28 VDC external: Up to 650 Ohms

• 32 VDC external: Up to 825 Ohms

Maximum Load at 16-320 mA Range

• 20 VDC external: Up to 15 Ohms

• 24 VDC external: Up to 25 Ohms

• 28 VDC external: Up to 40 Ohms

• 32 VDC external: Up to 50 Ohms

Protection and Switching

• Over-range protection: Less than +42.5 VDC

• Switch time on leg failure: Less than 10 ms typical

Diagnostic Indicators

Each Triconex 3806E includes six status indicators with light green color code:

• PASS: Module self-test passed

• FAULT: Channel fault detected

• ACTIVE: Module is driving outputs

• LOAD: Open loop detected on one or more points

• PWR1: Loop power source 1 is present

• PWR2: Loop power source 2 is present

Special Features

The Triconex 3806E includes several advanced design features for reliability. Each channel has a current loopback circuit that verifies analog signal accuracy. This verification works independently of load presence or channel selection. The module prevents a non-selected channel from driving any signal to the field. Ongoing diagnostics run on every channel and circuit continuously. A channel fault activates the FAULT indicator and the chassis alarm. The Triconex 3806E continues proper operation with up to two failed channels. The LOAD indicator activates if the module cannot drive current to one or more outputs. Redundant loop power sources are supported with individual PWR1 and PWR2 indicators. Mechanical keying prevents improper installation in a configured chassis.

Installation Guide

Follow these steps to install the Triconex 3806E correctly.

1. De-energize the entire chassis before handling the module.

2. Mount the required external termination panel (ETP) near the chassis.

3. Connect the ETP cable to the Tricon backplane interface.

4. Slide the Triconex 3806E into the designated slot.

5. Verify the mechanical keying matches your chassis configuration.

6. Connect redundant external loop power supplies (24-42.5 VDC).

7. Wire field devices to the correct output points (4-20 mA or 20-320 mA).

8. Use shielded twisted-pair cable for all analog output signals.

9. Apply loop power and check that PWR1 and PWR2 indicators turn on.

10. Perform a full output test across both current ranges before startup.

Package List

• 1 x Triconex 3806E analog output module

• 1 x Keying kit for slot configuration

• 1 x Module label with serial number

• 2 x Locking screws for vibration resistance

Frequently Asked Questions (FAQ)

1. Can I replace the Triconex 3806E while the system runs?
Yes, the Triconex 3806E supports hot-spare capability. You can replace a faulty module online without shutting down the process.

2. What does the LOAD indicator mean on this module?
The LOAD indicator on the Triconex 3806E activates when an open loop exists. This means the module cannot drive current to one or more output points.

3. Does the module stop working if one channel fails?
No, the Triconex 3806E continues normal operation with one or two failed channels. The FAULT indicator lights up, but the module still drives outputs correctly.

4. What is the difference between the two output current ranges?
The Triconex 3806E provides six points at 4-20 mA for standard actuators. Two points at 20-320 mA serve high-current devices like I/P converters for turbomachinery.

5. Why do I need an external termination panel for this module?
The Triconex 3806E requires a separate ETP for field wiring connections. The ETP interfaces with the Tricon backplane through a dedicated cable assembly.