Brain or Annunciator Overview

From EMIT Controls

See the bottom part of this page for a general overview, or the articles below for specific topics.

Brain Documents and Guides

Main Articles

Installation Guide

Main Overview

Fault and Output Status

Fault Event

Basic Setup and Configuration

Home Page Gauges

Shutdown Pins

No Flow (pulse) Inputs

B/C Timers

Pre- and Post-lube

Crank Control

Speed Control Output

Custom PID

ECU Selection

Testing Mode

Brain+ / Expansion Module

Digital Output Functions

Other Topics

Load Delay Timer

Rod Load Setup

Input Voltage Alarm

Custom Digital Output

Cylinder Temps

No Flow Status

Rod Load Status

Cooldown Mode

Panel to ADEM(r) Interfacing

Panel to ESM(r) Interfacing

Annunciator Wiring Diagram

Valve Setup

Purge Setup

Blowdown Setup

Bypass Valves

Output Testing

Screw Compressor Slide Control

Analog Differential Inputs

Special Buzzer Functions

Dual Recycle Setup

ECU Run Signal Debugging

Proportional Control Loops

Dynamic Speed De-Rate

Digital Inputs Detect Loop

Input Calibration

Miscellaneous Start Permissive

Miscellaneous Settings

Adding Engine Failure Status

Special Compressor Oil Pressure Alarm

Remote or Auto Restart

Adding a Run Status Output

Blowdown With Recycle Sequence


20320-ANN assembly ISO.jpg

The 20320 Annunciator or Brain is a digital system designed for monitoring and protecting natural gas engines and compressor equipment. The system works by monitoring a variety of inputs and shutting down the engine if an input crosses user-defined shutdown conditions. Additionally, the system monitors, displays, and datalogs the inputs for later user review. The system also contains analog and digital outputs for controlling various processes in the compression system.

All setup and status information is available through the EMIT Interface Module (EIM) or Dynamic Control Touchscreen (DCT) interfaces. The same display can be used for interfacing with other modules, such as the Air Fuel Ratio Controller (AFRC) or ignition. The annunciator can work in tandem with other modules, if present, in various scenarios, or can act as a standalone annunciator.

Key Concepts

Input Types

The following inputs are available on the annunciator:

  • Digital Inputs: Can be normally opened or normally closed, and are closed to ground on a faulted or unfaulted condition.
  • Analog Inputs: Can be configured to accept 4-20mA, 0-5V and 1-5V sensors. Most commonly used for pressure sensors, though any sensor of the above type can be used.
  • Thermocouples: Can be configured to Type K or Type J and monitors temperatures on the system.
  • Magnetic Pick Up: Used to monitor the speed of the engine or compressor

Input Class

Each input will belong to a certain input class, which determines if an input is armed. If an input is armed it will fault if it reaches a fault condition. If it is not armed, the input will not fault regardless of the reading. The following are the input classes and their arming condition.

  • Class ESD: The input is always armed, even in test mode. For every other input class, the input will not be armed in test mode regardless of class.
  • Class A: The input is always armed (Except test mode).
  • Class B1: The input will start unarmed after a ‘reset’ button press, and becomes armed after the B1 timer expires.
  • Class B2: The input will start unarmed after a ‘reset’ button press, and becomes armed after the B2 timer expires. Generally, the B2 timer is intended to be the shorter B timer.
  • Class C: The input will start unarmed after a ‘reset’ button press, and will become armed after it first becomes clear (unfaulted). There is also an optional global C timer to arm all C inputs after a specified time

Alarm Action

Each input will also have an alarm action, which determines what happens when an input is armed and faulted.

  • Shutdown: The engine will be shut down. The first input to fault causing the shutdown will be saved for user review.
  • Warning: The warning lamp will be illuminated and the state changed to “Running with warnings”
  • No Action: Nothing will happen when an input faults. However, the input is still enabled to be viewed in the system.
  • Disabled: The input is totally disabled

Additional Alarm Warning

Up to 8 inputs can also have a secondary warning, which will cause an alarm event to be added to the alarm screen when a certain criteria is met. This can be added regardless of the other action of the input (except disabled).