ASCO Series 300 Automatic Transfer Switch Wiring Diagrams

This document provides detailed wiring information for the ASCO Series 300 Automatic Transfer Switch, rated for 600 Amperes and equipped with Group 1 Controls.

Control Features

The control features section outlines the operational aspects and functionalities of the transfer switch. Key aspects include:

Control Features: Details specific operational settings and capabilities.
Control Panel: Refers to the interface and logic unit managing the transfer switch operations.
Solenoid Position: Indicates the state of the solenoids (e.g., Closed, TDC - Top Dead Center) which are critical for switch operation and timing.
Transfer Switch Test & Adjustment Procedure: Specifies procedures for testing and adjusting the transfer switch, including control cut-off settings.

Field Connections

This section details the external connections required for the transfer switch, ensuring proper integration with power sources and loads.

Diagram Description: The Field Connections diagram illustrates the terminal points for connecting the transfer switch to the power sources (Normal and Emergency) and the Load. It shows the arrangement of terminals for phase conductors (L1, L2, L3), neutral (N), and potentially ground connections.

Main Power Poles

This section describes the main power switching mechanism of the transfer switch.

Diagram Description: The Main Power Poles diagram visually represents the heavy-duty contacts that switch the main power between the normal and emergency sources. It shows the physical arrangement of these poles for three-phase power distribution.

TS Operator Circuit

This section details the electrical control logic for the transfer switch operation.

Diagram Description: The TS Operator Circuit diagram illustrates the internal wiring and control signals that govern the operation of the transfer switch. It includes components like control coils, auxiliary contacts, and timing circuits that manage the transfer sequence between power sources.

Wire Run Listing

This comprehensive table lists all wires used within the transfer switch assembly, specifying their harness, destination, and gauge.

Wire	Harness Locator	CLR AWG	Destination
P-1	TS-18	18	(P) MAIN TS
P-2	TS-A	18
TP-3	TS-14	14
P-4	TS-	18
P-5	TS-B	18
P-6	TS-7	6
TS-7	TS-19	6
P-7	TS-5	7
TS-5	TS-17	7
P-8	TS-24	8
TS-24	TB-1	8
P-9	TS-25	9
TS-25	TB-2	9
P-10	TS-21	10
P-11	TS-2	11
P-12	TS-1	12
TS-1	TS-13	12
P-13	TS-22	13
P-14	TS-23	14
P-15	TS-16	15
P-16	TS-20	16
P-17	TB-3	17
P-18	TS-6	18
P-19	TS-9	19
P-20	TS-10	20
P-21	TS-11	21
P-22	TS-4	22
P-23	TS-8	23
P-24	TS-12	24
TS-27	TB-4	25
TS-28	TB-5	26
TS-29	TB-6	27
CP-TB-4	11BG-TB-9	16	OPTIONAL ACC. 11BG CKTS.
TS-30	TB-7	18
TS-31	TB-8	23
TS-32	TB-9	14

Note: The wire run listing also includes entries for optional accessories like the Engine Exerciser & Source Availability Signal (11BG) and other optional accessories (14AA & 14BA).

Control Signals & Indication

This section details the signals used for controlling and monitoring the transfer switch's status.

Diagram Description: The Control Signals & Indication diagram shows the interface between the control panel and various components, including signals for engine exerciser, source availability, and status indications. It maps control panel terminals (CP) to transfer switch terminals (TS) and accessory terminals.

Source Circuits

This section describes the wiring for both the emergency and normal power sources.

Emergency Source Circuits Diagram Description: This diagram illustrates the connections for the emergency power source, including sensing lines (EA, EB, EC, EN) and the main power feed to the switch. It shows how the emergency source is connected to the transfer switch poles.

Normal Source Circuits Diagram Description: Similarly, this diagram shows the connections for the normal power source, including sensing lines (NA, NB, NC, NN) and the main power feed. It depicts how the normal source is connected to the transfer switch poles.

Load Terminal Circuits Diagram Description: This diagram shows the main terminal connections for the load, indicating where the power from the selected source is delivered.

Physical Diagram

This section provides a visual representation of the transfer switch's physical layout.

Diagram Description: The Physical Diagram offers a view of the transfer switch enclosure, showing the arrangement of the main power poles, contactors, and control panel. It provides an overview of the internal physical configuration of the unit.

General Notes and Specifications

This document includes several important notes and specifications:

Optional Neutral Types: The type of neutral connection (None, Switching Contacts, Overlapping Contacts, Solid Bus Plate) is determined by the "Explanation of Catalog Number Codes" found in the catalog number chart on Sheet 1.
ATS Shown Closed on Normal Source: A note indicates that the diagram depicts the Automatic Transfer Switch (ATS) in a state where it is connected to the Normal Source.
Manufacturing Tolerances: Manufacturing tolerances are to be in accordance with ASCO Procedure MP-1-003.
Plastic Parts: For plastic parts, refer to MP-1-055.
Property of ASCO Power Technologies: The drawing is proprietary to ASCO Power Technologies, and its use is permitted only for work related to ASCO products. All rights of design or invention are reserved.
Drawing Revisions: The document includes revision history (e.g., REV. TO ECN NO. A, 205833 JPB 9/8/05; 208021 JPB 3/21/06; 213521 WK BK 05/29/07) indicating updates and changes.

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