ASCO Series 300 Automatic Transfer Switch Wiring and Control Diagrams

This document details the wiring, control features, and physical layout for ASCO Series 300 Automatic Transfer Switches (ATS) rated 225, 260, and 400 Amperes, specifically those equipped with Group 1 Controls.

Product Identification

Brand: ASCO

Product Line: Series 300 Automatic Transfer Switch (ATS)

Ratings: 225 Amperes, 260 Amperes, 400 Amperes

Control Type: Group 1 Controls

Application: Single Phase Wiring

Control Features and Operation

The ASCO Series 300 ATS offers various control features for reliable power transfer:

Control Panel (CP): The central unit for managing ATS operations.
TS (Transfer Switch): The core component that switches between power sources.
Solenoid Position: Indicates the operational state of the transfer switch mechanism.
Transfer Switch Test & Adjustment Procedure: Includes settings for control cut-off (contact opening).
Optional Neutral Types: Configuration options available as per catalog number codes.
Accessory 11BG: Programmable Engine Exerciser and Source Availability Signal module.
Accessory 44G/44A: Optional connections for load or customer power supply (120VAC).
Serial Communication Module: An optional device for integrating with communication networks.

Wiring Diagrams and Schematics

The document provides comprehensive wiring diagrams:

Main Power Poles

Illustrates the primary power connections for Normal (NL1, NL2, NLO) and Emergency (EL1, EL2, ELO) sources, and the connection to the Load terminals. These diagrams show the physical layout of the power poles within the ATS.

TS Operator Circuit

Details the electrical pathways for the transfer switch operator, including connections from the control panel (CP) to various points on the TS (e.g., TS-1 through TS-72, P1, P2, J1, J2).

TS Control Contacts

Depicts the internal control contacts of the transfer switch, showing their function in signaling operational status and enabling control sequences.

Source Circuits (Normal & Emergency)

Schematics for Normal and Emergency source circuits show how power is sensed and routed to the ATS, including connections to the control panel for monitoring source availability.

Load Terminal Circuits

Illustrates the final connection point where the load receives power from the selected source (Normal or Emergency).

Control Signals & Indication

Diagrams for accessory connections, such as the Engine Exerciser and Source Availability Signals, are shown. These connect to the control panel via terminal blocks (e.g., TB-4, TB-9).

Physical Layout and Operator Interface

A physical diagram shows the internal arrangement of the ATS enclosure:

Enclosure View: The transfer switch (TS) is shown from the inside front.
Control Panel (Group 1): Features the operator interface, including indicator lights and push buttons.
Operator Interface Membrane Assembly: The user-facing panel with controls.
Indicator Lights (DS1-DS5):
- DS1: TS Connected to Normal
- DS2: TS Connected to Emergency
- DS3: Normal Source Available
- DS4: Emergency Source Available
- DS5: Engine Exerciser
Push Buttons (PB1-PB3):
- PB1: Bypass Time Delay
- PB2: Transfer Switch Test
- PB3: Set Engine Exerciser
Accessories: Includes the Engine Exerciser & Source Availability Signals module and an optional Serial Communication Device.
Other Components: Bonding strap for grounding, heater, and door hinge are also depicted.

Wire Run Listing

A detailed wire run list is provided for the 225-400 Ampere range. It specifies wire numbers, their source and destination terminals (e.g., TS-8 to P1-8), and the corresponding AWG gauge. This is essential for installation, maintenance, and troubleshooting.

Manufacturing and Revision Details

The document adheres to ASCO manufacturing tolerances as per procedure MP-2-1-003. It also includes revision history, referencing Engineering Change Notices (ECNs) and dates, indicating design updates.

Manufacturer: ASCO Power Technologies, LP.

Address: Florham Park, New Jersey 07932 U.S.A.

Drawing Number: 733500

Drawing Series: E300 ATS 1PH 225-400 AMPS

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