ASCO 300 Series G3MGDQ Transfer Switch Wiring Diagrams

Model: 300 Series (G3MGDQ)

Rating: 1000-3000 Amperes

Manufacturer: ASCO Power Technologies

Overview

This document presents detailed wiring diagrams, connection schematics, and technical specifications for ASCO 300 Series manually operated transfer switches, specifically the G3MGDQ model, rated for 1000 to 3000 Amperes. It covers essential information for installation, operation, and maintenance.

Key Electrical Connections and Features

The diagrams illustrate various connection points and functionalities:

Field Connections Base: Terminals for primary control signals, engine start initiation, and serial communication interfaces (e.g., RS-485).
Field Connections for Optional Accessories: Dedicated terminals for integrating optional modules such as source availability indicators, common alarm outputs, and phase rotation monitoring systems.
Main Power Poles: Connections for Source 1, Source 2, and Load, typically using Cam-Lok connectors for robust power transfer.
Neutral and Grounding: Provisions for connecting neutral conductors and ensuring proper chassis or equipment grounding.
Current Transformers (CTs): Details on the installation and wiring of CTs for current sensing and metering.
Surge Protection: Integration points for surge suppressors to protect equipment.
Digital Power Meter (DPM): Wiring for optional DPMs to provide detailed power quality measurements.

Diagram Types

The document comprises several types of diagrams to guide users:

Power and Control Wiring Diagrams

These schematics map the flow of main power between sources and the load, alongside the control circuits that manage the transfer process, including engine start signals and source status indications.

Physical Diagrams

Illustrations showing the physical arrangement of components within the transfer switch enclosure, detailing the placement of bus bars, terminal blocks, operator controls, and mounting provisions for accessories.

Accessory Circuit Diagrams

Specific wiring layouts for various optional accessories, demonstrating how they integrate with the main transfer switch functionality.

Optional Accessories

The ASCO 300 Series transfer switches can be equipped with several optional accessories to enhance functionality:

171 Series (e.g., 171B, 171E, 171K): These often provide enhanced signaling, such as source availability indicators and engine start signals.
171*P Series: Typically adds features like manual engine start or keyed engine start capabilities.
72EE: A serial communications module (RS-485) enabling remote monitoring and control.
135L Series: An optional Digital Power Meter (DPM) for comprehensive power quality analysis.

Detailed wiring instructions for these accessories are provided within the document.

Wire Run Listings Summary

The document contains extensive tables detailing wire run listings for various accessories and configurations. These tables are crucial for accurate installation and troubleshooting, mapping specific wire numbers, their gauge (AWG), color coding, and precise connection points (e.g., terminal blocks, plugs, jacks) to their respective destinations.

Due to the extensive nature of these tables, a full transcription is not provided here. However, they typically include columns for:

Wire No.	Connection Point (Jack/Plug/Terminal)	Color	Gauge (AWG)	Destination
Example: 1	J-1, AP-1	BLK	16	TB-1, AUX-85
Example: 35	AP-6, PL1-(+)	BLK	16	PL1-(+), PL2-(+)
Example: 100	AP-MOXA-GND, EQUIP. GND	GRN	16	AP-MOXA-GND, EQUIP. GND

Users should refer to the original document for the complete and detailed wire run listings for specific accessory configurations.

Important Notes

Wiring diagrams are essential for correct installation and maintenance procedures.
Physical layout diagrams may differ based on the specific ampere rating and enclosure type of the transfer switch.
Always consult the original documentation relevant to your specific model and installed accessories.
Ensure all wiring practices adhere to applicable local electrical codes and ASCO's recommended installation guidelines.

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