ABB AO820 Output Module

Description

ABB AO820 Output Module

## Product Overview

The ABB AO820 is an Analog Output module featuring 4 galvanic isolated channels. Unlike many other modules that share a common ground, each channel on the AO820 is individually isolated, making it ideal for environments with high electrical noise or where signal integrity is critical. It is commonly used with the AC 800M controller.

## Technical Specifications

## Key Product Advantages

• Individual Channel Isolation: Each channel is galvanically isolated from the others and from the system power. This prevents ground loops and ensures that a fault in one field device does not affect the other three channels.

• High Versatility: The module can be configured for either current or voltage signals, allowing it to interface with a wide variety of actuators, valves, and motor drives.

• Robust Diagnostic Capabilities: Features built-in self-diagnostics. The front-panel LEDs provide immediate status updates (Run, Fault, Warning), reducing troubleshooting time.

• Hot Configuration in Run (HCIR): Allows for maintenance and module replacement without shutting down the entire process, maximizing system uptime.

## Product Applications

The AO820 is typically utilized in heavy industrial environments where precision and reliability are non-negotiable:

• Process Control: Driving control valves and positioners in chemical or oil and gas plants.

• Speed Control: Providing setpoint signals to Variable Frequency Drives (VFDs).

• Power Generation: Managing excitation systems or turbine control.

• Water Treatment: Controlling dosing pumps based on flow or pH requirements.

## Important Considerations & Precautions

1. Terminal Base Compatibility: The AO820 must be used with a compatible MTU (Module Termination Unit), such as the TU810, TU812, or TU814.

2. External Power: Ensure that the 24V DC process power supply is stable and within the specified tolerance to maintain output accuracy.

3. Wiring: Due to the individual isolation, ensure that the wiring for each channel is kept distinct. Crossing grounds between channels would negate the isolation benefit.

4. Heat Dissipation: When mounting multiple AO820 modules in a cabinet, ensure adequate ventilation as the module generates up to 4.5W of heat during full-load operation.

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