ASCO Series G386 Non-Automatic Transfer Switch Wiring and Controls

General Information and Features

This document provides wiring diagrams and technical details for ASCO Series G386 Non-Automatic Transfer Switches rated 1600-3000 Amperes with Group I Controls.

General Notes:

Switch shown de-energized and connected to the Normal Source.
Device symbols and designations follow NEMA Publication ICS 1-1983.
All wiring is #16 AWG, tinned, stranded copper unless otherwise indicated.
'[O]' on terminal blocks indicates available field connection point.
'[•]' on terminal blocks indicates factory connection point.
Control and accessory wiring is routed per ASCO Assembly Procedure GS451261.
An Operator's Manual is furnished with each transfer switch; refer to it prior to installation and operation.
Ground strap on the control panel is affixed to the chassis at the lower left control panel mounting stud.

Standard Factory Settings for Control Panel:

DIP Switches S1, S2, and S3 settings are factory configured. Timer settings P1 (Timer E/N) and P2 (Timer N/E) are set fully counter-clockwise (CCW).

Normal Source Voltage Pickup: Factory set at 90% (S1-Actuator 3 ON). Setting S1-Actuator 3 OFF is for 95% Normal Source Voltage Pickup.
Emergency Source Voltage Pickup: Factory set at 90% (non-adjustable).
Emergency Source Voltage Dropout: Factory set at 75% (non-adjustable).
Emergency Source Frequency Pickup: Factory set at 95% (non-adjustable).

Warning: Any change in these settings may affect the normal operation of the transfer switch.

Key Features:

Selector Switch (SS): Three-position, momentary, spring-return to center for manual transfer to Normal and Emergency sources. Located on the lower left front of the TS. Terminal block range: 22-12 AWG.
Features 14A & 14B Auxiliary Contacts: One Form C contact each to indicate connection to Normal (14A) and Emergency (14B). Connected to the Field Connections Terminal Block (TB). Rated 10 AMPS, 32 VDC, 250 VAC.
Signal Light PL1 (Green LED): Indicates when the transfer switch is connected to the Normal Source (Standard Feature 9A).
Signal Light PL2 (Red LED): Indicates when the transfer switch is connected to the Emergency Source (Standard Feature 9B).
NR Contacts: One set of Form C contacts (1 N/O & 1 N/C) that change position upon expiration of the Normal Source Outage Delay and reset on expiration of the Engine Cool Down Delay. Rated 6 AMPS RESISTIVE at 28V DC or 120V AC maximum.

Optional Accessories

ACC. 72A Serial Communications Option: RS-485 serial interface for remote monitoring and control from ASCO communications-based products. Wiring includes Rx Data (+/-) and Tx Data (+/-). Recommended cable: Belden 9842 or 9829 (standard) or 89729 or 82729 (plenum rated), or equivalent. Earth shield to be grounded at the host device only.
ACC. 6Q: Key-operated transfer control switch for transferring to Normal or Emergency. Three-position momentary, spring-return to center, with key removable in the center position.
ACC. 9C: Signal Light (PL3 Green LED) indicating Normal Source Available.
ACC. 9D: Signal Light (PL4 Red LED) indicating Emergency Source Available.
ACC. 14AA: Two auxiliary contacts closed on Normal (one set of Form C).
ACC. 14BA: Two auxiliary contacts closed on Emergency (one set of Form C).
ACC. 27: Inphase Transfer Control Logic to initiate inphase transfer of loads between live sources, preventing nuisance tripping and mechanical damage. Activated by a DIP switch setting. Factory set as disabled.
ACC. 31: One set of Form C contacts (1 N/O & 1 N/C) that change position on activation of a selectable time delay before transfer (LD TDBT). Selectable delays: 0, 3, 10, or 20 seconds. Factory set at 0. Output contacts rated 5 AMPS RESISTIVE at 28V DC or 120V AC maximum.
ACC. 37B: Extension harness, 72 inches (1828mm) long, for units shipped open to accommodate customer mounting of controls and switch.
ACC. 43M: Provisions for customer-supplied 3-position selector switch: Position 1 - Local Control Enable, Position 2 - Remote Control Transfer to Normal, Position 3 - Remote Control Transfer to Emergency.

Wiring Diagrams and Connections

The diagrams illustrate the internal and external wiring for the ASCO Series G386 transfer switches. Key sections include:

Main Power Poles:

Depicts the main power connections for the Normal Source (terminals NA, NB, NC, NN) and the Emergency Source (terminals EA, EB, EC, EN), which connect to the Load terminals (LA, LB, LC, LN). The diagram shows the transfer switch mechanism connecting the load to either the normal or emergency source.

Control Panel Circuits:

Schematics for the control panel logic, including:

Normal Source Sensing: Connections from the control panel to the normal source power lines.
Emergency Source Sensing: Connections from the control panel to the emergency source power lines.
Load Terminal Circuits: Connections to the load terminals.
Control Signals & Indication: Wiring for indicator lights (PL1, PL2, PL3, PL4), selector switch (SS), and auxiliary contacts (14A, 14B, 14AA, 14BA). This section details connections via various wire harnesses (e.g., Harness 605454, 483763, 619510-037) and terminal points on the control panel (CP) and transfer switch (TS).

Detailed Wiring Connections:

A comprehensive table lists specific wire connections, including wire numbers, harness locators (e.g., P, P1, P2, J3, TS(AUX1), TS(MUS)), and the gauge (AWG) of the wire used. This table facilitates precise installation and troubleshooting.

Example connections include:

Wire No. 1: P-2 to TS-1 (16 AWG)
Wire No. 31: TS(AUX1)-27 to TB-4 (16 AWG)
Wire No. 170: J-1 to P11-8 (16 AWG)
Wire No. 140: P13-5 to PL1(-) (22 AWG)

Connections for optional accessories like ACC. 14AA & 14BA are also detailed.

Physical Diagrams

Visual representations of the transfer switch and control panel components:

Enclosure / TS (Transfer Switch) Physical Diagram:

Illustrates the physical layout within the transfer switch enclosure. Key components shown include the transfer switch mechanism, solenoids, coils, internal terminal blocks (TB), and internal connections labeled MUS and AUX1. A detail view shows the top view of MUS and AUX1 connections. A bonding strap (PN 098323-019) is also indicated.

Group 1 Control Panel Physical Diagram:

Shows the physical arrangement of the control panel. This includes terminal blocks (P11, J11, P12, J12, J14, P14), operator controls such as indicator lights (PL1, PL2, PL3, PL4) and the selector switch (SS), and the optional ACC. 72A Serial Communication Module with its connectors (72A-P1, 72A-J1, 72A-J2).

Door Inside (Panel) Operator Controls:

A close-up view of the control panel door, detailing the placement of indicator lights (PL1, PL2, PL3, PL4) and the selector switch (SS).

Catalog Number Explanation

The catalog number is structured to define various configurations of the transfer switch. Key codes include:

Category	Code	Description
Frame Type	G	"G" Frame
Amps	CDEF	1600 Amperes
Amps	H	2000 Amperes
Amps	J	2600 Amperes
Amps	K	3000 Amperes
Voltage	208, 220, 230, 240, 380, 400, 415, 440, 460, 480, 550, 575, 600	Standard voltages (50 or 60 Hz)
Controller	1	Group 1 Controls
Neutral Type	BLANK	None
Phase	3	3-Phase (3 or 4 Wire)
Enclosure Type	BLANK	Open Type (No Enclosure)
Enclosure Type	C	General Purpose, Indoor
Enclosure Type	3R	Outdoor, Rainproof, Sleet & Ice Resistant
Enclosure Type	4	Indoor/Outdoor, Watertight & Dusttight
Accessory Code	BLANK	None
Accessory Code	JKLMNPQR	Various Optional Accessories (e.g., 6Q, 9C, 9D, 14AA, 14BA, 27, 31, 43M, 72A)

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