ASCO Series 300 Automatic Transfer Switch Operator's Manual

Introduction

This document serves as the operator's manual for the ASCO Series 300 Automatic Transfer Switch (ATS) equipped with a G Controller, specifically model 381333-122D. ASCO Series 300 ATSs are designed for reliable power transfer and are listed under the Underwriters Laboratories (UL) 1008 Standard for Safety for Automatic Transfer Switches.

This manual provides essential information for the proper installation, operation, and maintenance of the ATS unit. Please read all instructions carefully before operating the equipment.

Product Overview

The ASCO Series 300 Automatic Transfer Switch is a critical component in emergency and standby power systems. It automatically senses the loss of primary power and transfers the load to an alternate power source, such as a generator, and then transfers the load back to the primary source when it is restored.

Key features include:

• Automatic detection of primary power failure and restoration.
• Transfer of electrical load between primary and alternate power sources.
• Compliance with UL 1008 standards for safety and performance.
• Integration with ASCO G Controllers for advanced functionality.

Specifications

Detailed technical specifications for the ASCO Series 300 ATS with G Controller (381333-122D) are provided below. These specifications are crucial for understanding the unit's capabilities and limitations.

Operation

The ASCO Series 300 ATS operates automatically based on the status of the primary and alternate power sources. The G Controller manages the transfer logic.

Normal Operation

When primary power is available and within acceptable parameters, the ATS connects the load to the primary source. The G Controller monitors both sources.

Power Failure

Upon detecting a loss of primary power, the G Controller initiates a sequence:

1. The ATS disconnects the load from the primary source.
2. The G Controller signals the alternate power source (e.g., generator) to start.
3. Once the alternate source is stable, the G Controller transfers the load to the alternate source.

Power Restoration

When primary power is restored and stable:

1. The G Controller detects the restored primary power.
2. After a predetermined delay, the G Controller transfers the load back to the primary source.
3. The alternate power source is then shut down.

Indicator Lights: The G Controller typically features indicator lights to show the status of power sources and the ATS position. For example:

• Green light: Primary power available.
• Yellow light: Alternate power available.
• Red light: Fault condition or power failure.
• Indicator for ATS position (e.g., "LOAD ON PRIMARY", "LOAD ON ALTERNATE").

Manual Operation: The unit may also feature manual control switches or modes for testing or emergency situations. Refer to specific control panel details for manual operation procedures.

Maintenance

Regular maintenance is essential for the reliable operation of the ASCO Series 300 ATS. Consult the full service manual for detailed procedures. General maintenance includes:

• Visual inspection of the unit and connections.
• Periodic testing of the transfer function.
• Cleaning of contacts and components as recommended.
• Checking and updating controller settings.

Safety Note: Always ensure that the ATS is de-energized and locked out before performing any maintenance. Consult qualified personnel for all service operations.

Wiring Data and Outline/Mounting

Detailed wiring diagrams and outline dimensions are critical for installation and troubleshooting. These sections typically include:

• Wiring Diagrams: Schematics illustrating the electrical connections for power sources, load, control circuits, and the G Controller. These diagrams show the flow of power and control signals.
• Outline and Mounting Data: Physical dimensions of the ATS unit, mounting hole locations, and recommended clearances for installation. This information ensures proper physical integration into the electrical system.

(Note: Specific diagrams and detailed tables are not included here but would be present in the full manual.)

Safety Information

This equipment involves hazardous voltages. Only qualified personnel should install, operate, or maintain this ATS. Always follow lockout/tagout procedures and wear appropriate personal protective equipment (PPE).

• Ensure proper grounding of the unit.
• Verify that all connections are tight and secure.
• Do not operate the ATS if any damage is apparent.