ASCO Series 300 Automatic Transfer Switches - 600 Amperes with Group 1 Controls

This document provides wiring diagrams, control features, and physical specifications for the ASCO Series 300 Automatic Transfer Switches (ATS) rated 600 Amperes, equipped with Group 1 Controls.

Control Features

The following features are designed to ensure reliable automatic transfer of power between normal and emergency sources:

Voltage and Frequency Selection: The transfer switch monitors both normal and emergency source voltages and frequencies to determine availability and initiate transfer.
Differential Voltage Setting: The switch transfers to the emergency source when the normal source voltage drops below a specified differential setting.
Single Phase Voltage Sensing: Dedicated sensing for both emergency and normal sources.
Frequency Sensing: Monitoring of source frequencies for proper operation.
Non-Failsafe Pickup Setting: A delay setting for transferring to the emergency source.
Non-Failsafe Normal Pickup Setting: A delay setting for transferring back to the normal source.
Remote Transfer to Emergency Source: Initiated by a customer-supplied signal to the transfer switch control terminals.
Remote Transfer to Normal Source: Initiated by a customer-supplied signal to the transfer switch control terminals.
Engine Start Signal: A signal provided to start the engine when the normal source is unavailable.
Emergency Source Available Signal: A signal indicating the emergency source is available.
Normal Source Available Signal: A signal indicating the normal source is available.
Source Acceptance Delay (Emergency/Normal): Adjustable delay (0-5 seconds) before transferring to a source after it becomes available and the engine is running.
Emergency Non-Transfer Delay: Adjustable delay (0-5 seconds) for transfer to emergency after engine start and source availability.
Normal Non-Transfer Delay: Adjustable delay (0-5 seconds) for transfer to normal after engine start and source availability.
Engine Start Delay: Adjustable delay (0-5 minutes) between normal source voltage drop and engine start signal initiation.
One Shot Transfer: Ensures a single, uninterrupted transfer motion, preventing hunting between sources even with voltage fluctuations.
Operator Interface Indicators & Controls: Visual indicators for switch status and manual operation buttons.
Transfer Switch Test Button: Initiates a test cycle, transferring to emergency and returning to normal.
Emergency Transfer Button: Initiates an immediate transfer to the emergency source.
Normal Transfer Button: Initiates an immediate transfer to the normal source.
Emergency Source Available Indicator: Light indicating emergency source availability.
Normal Source Available Indicator: Light indicating normal source availability.

Diagram Description: A schematic illustrating various control functions and settings, including voltage/frequency sensing, various delay timers (engine start, source acceptance, non-transfer, available), and operator interface controls like test, emergency transfer, and normal transfer buttons, along with indicator lights for source availability.

Remote Features

These features allow for external control and monitoring of the transfer switch:

Remote Transfer to Emergency Source: Requires a customer-supplied signal to initiate transfer to the emergency source via control terminals.
Remote Transfer to Normal Source: Requires a customer-supplied signal to initiate transfer to the normal source via control terminals.

Control Field Connections

This section details the wiring points for field connections related to control and remote operations.

Diagram Description: A schematic showing terminal connections for remote control signals, engine start, source availability (normal and emergency), and field connections. It includes labels like CP (Control Panel), TS (Transfer Switch), and various terminals (e.g., 13-14, 15-16, 17-18, 19-20) for different functions. It also shows connections for optional accessories like ACC. 11BG and ACC. 14AA/14BA.

TS Control Contacts:

TS	SOLENOID POSITION	TDC	CLOSED BEFORE	CLOSED
13-14
15-16
17-18
19-20

TDC (Top Dead Center) indicates the transfer switch position.

Transfer Switch Test & Adjustment Procedure: Specifies control cut-off (contact opening) setting.

Optional Accessories:

ACC. 11BG: Programmable engine exerciser & source availability signal (optional).
ACC. 14AA & 14BA: Optional accessories.

Catalog Number Information:

TYPE	POLE	RATING	CONTROL	NEUTRAL TYPE
ATS	3	600A	GROUP 1	NONE
				SWITCHING CONTACTS
				OVERLAPPING CONTACTS
				SOLID BUS PLATE

Catalog Number: 783738

General Notes

All wiring is in accordance with NEC (National Electrical Code) and applicable local codes.
All wires are color-coded and numbered for ease of identification.
Control wires are 18 AWG, and power wires are sized according to the current rating.
The transfer switch is designed for single-phase operation.
Optional accessories, such as engine exercisers and source availability signals, can be integrated.
Field connections for source availability signals are provided.
Refer to the "Explanation of Catalog Number Codes" on Sheet 1 for detailed catalog number breakdowns.
The diagram shows the ATS closed on the Normal Source by default.

Optional Accessories

ACC. 11BG: Programmable engine exerciser and source availability signal.
ACC. 14AA & 14BA: Optional accessories.

Day/Week Programmed Exerciser: The exerciser is activated on a programmed day and time for a programmed duration. It simulates a power outage and tests the transfer switch operation.

Manual Transfer Switch Test: A push-button on the operator interface initiates a test cycle.

Remote Transfer Signals: Signals for remote initiation of transfer to normal or emergency sources.

Source Availability Signals: Signals indicating the availability of normal and emergency power sources.

Control Panel (CP): Houses the control logic and interface for the transfer switch.

TS Control Contacts: Table detailing transfer switch (TS) control contacts and their functions, including solenoid positions and contact states (closed before, closed).

TS	SOLENOID POSITION	TDC	CLOSED BEFORE	CLOSED
13-14
15-16
17-18
19-20

Transfer Switch Test & Adjustment Procedure: Specifies control cut-off (contact opening) setting.

Main Power Poles

Diagram Description: A schematic illustrating the main power distribution for the transfer switch. It shows three sets of three parallel conductors representing the Emergency Source (ELI, EL0, EL2), Load (LLI, LLO, LL2), and Normal Source (NL1, NLO, NL2). Lines connect these poles, indicating the path of power flow. Optional neutral types (None, Switching Contacts, Overlapping Contacts, Solid Bus Plate) are noted.

EMERGENCY: Represents the emergency power source conductors (ELI, EL0, EL2).

LOAD: Represents the load conductors (LLI, LLO, LL2).

NORMAL: Represents the normal power source conductors (NL1, NLO, NL2).

Optional Neutral Types:

NONE
SWITCHING CONTACTS
OVERLAPPING CONTACTS
SOLID BUS PLATE

Note: ATS shown closed on Normal Source.

TS Operator Circuit

Diagram Description: A schematic depicting the operator circuit of the transfer switch. It shows the control panel (CP) connected to the transfer switch (TS) via solenoids. It illustrates the normal and emergency source connections (NL, EL) and their respective control circuits, including contacts like TS-13/14, TS-15/16, etc., and associated components like coils and relays.

This circuit controls the operation of the transfer switch, including energizing solenoids for normal and emergency positions.

Wire Run Listing

This section provides a detailed list of wires, their harness locators, and their destinations for control and signal circuits.

WIRE No.	HARNESS LOCATOR (P) MAIN TS	CLR	HARNESS LOCATOR TS-CP HARNESS (J, P1, P2)	CLR	AWG	ACCESSORY 11BG PROGRAMMABLE ENGINE EXERCISER & SOURCE AVAILABILITY SIGNAL (OPTIONAL)
1	P-1,TS-18	18	J-1,CP-P1-8	16	21
2	P-2.TS-A		J-2,CP-P1-15			CP SENSING
3	P-3.TS-14		J-3,CP-P1-2	13
4	P-4.TS-3		J-4,CP-P1-4
5	TS-3,TS-15		J-5,CP-P1-17
6	P-5,TS-B		J-6,CP-P1-12
7	P-6.TS-7		J-7,CP-P1-1
8	TS-7,TS-19		J-8,CP-P2-2
9	P-7,TS-5		J-9,CP-P2-3
10	TS-5,TS-17		J-10.CP-P2-8
11	P-8,TS-24		J-11.CP-P1-10
12	TS-24,TB-1		J-12.CP-P1-1
13	P-9,TS-25		J-13,CP-P2-9
14	TS-25,TB-2		J-14,CP-P2-10
15	P-10,TS-21		J-15,CP-P1-5
16	P-11,TS-2		J-16,CP-P1-13
17	P-12,TS-		J-17,CP-P2-1
18	TS-1,TS-13		J-18.CP-P1-14	22	14
19	P-13,TS-22
20	P-14,TS-23
21	P-15.TS-16
22	P-16,TS-20
23	P-17,TB-3
24	P-18,TS-6
25	P-19,TS-9
26	P-20,TS-10
27	P-21.TS-11
28	P-22,TS-4
29	P-23,TS-8
30	P-24,TS-12
31	TS-27,TB-4
32	TS-28,TB-5
33	TS-29,TB-6

DEAD END WIRES:

WIRE No.	HARNESS LOCATOR	CLR	AWG
11	P-11,TS-2
18	P-18,TS-6
20	P-20,TS-10

OPTIONAL ACCESSORIES:

WIRE No.	OPTIONAL ACC. 11BG CKTS.	CLR	AWG
28	CP-TB-4,11BG-TB-9	16

OPTIONAL ACCESSORIES:

WIRE No.	OPTIONAL ACC. 14AA & 14BA	AWG
31	TS-30,TB-7	18
32	TS-31,TB-8
33	TS-32,TB-9

Emergency Source Circuits

Diagram Description: A schematic showing the electrical connections for the emergency power source. It depicts three conductors labeled EL1, EL0, and EL2, representing the phases and neutral/ground. These are connected to the transfer switch (TS) and control panel (CP) for monitoring and control.

EMERGENCY: Represents the emergency power source conductors.

Load Terminal Circuits

Diagram Description: A schematic illustrating the load connections. It shows three conductors labeled LL1, LL0, and LL2, which are connected to the load side of the transfer switch and distribute power to the connected loads.

LOAD: Represents the conductors supplying power to the connected loads.

Normal Source Circuits

Diagram Description: A schematic showing the electrical connections for the normal power source. It depicts three conductors labeled NL1, NL0, and NL2, representing the phases and neutral/ground. These are connected to the transfer switch (TS) and control panel (CP) for monitoring and control.

NORMAL: Represents the normal power source conductors.

Physical Diagram

Diagram Description: A physical layout of the transfer switch enclosure and its internal components. The main diagram shows the transfer switch (TS) with its internal poles (LL1, LL0, LL2, NL1, NL0, NL2, EL1, EL0, EL2) and the coil. The door interior shows the Group 1 Control Panel (CP) with its terminal blocks and connectors, the Operator Interface Membrane (with buttons and indicators like DS1-DS5, PB1-PB3), and optional accessories like the ACC. 11BG module and ASCO Optional Serial Communication Device. Field and factory connection points are also indicated.

ENCLOSURE: The main housing for the transfer switch components.

TS (Transfer Switch) View from Inside Front: Depicts the internal power poles and the transfer switch mechanism.

COIL: The electromagnetic coil that actuates the transfer switch.
LL1, LL0, LL2: Load conductors.
NL1, NL0, NL2: Normal source conductors.
EL1, EL0, EL2: Emergency source conductors.
RC, CR: Components within the transfer switch mechanism.

DOOR (INSIDE): Components mounted on the inside of the enclosure door.

GROUP 1 CONTROL PANEL (CP): Contains terminal blocks (CP-P1, CP-J1, CP-P2, CP-J2, CP-J4) and connectors for control signals and power.
OPERATOR INTERFACE MEMBRANE: Includes status indicator lights (DS1-DS5) and push buttons (PB1-PB3) for manual control and diagnostics.
DS1: TS Connected to Normal.
DS2: TS Connected to Emergency.
DS3: Normal Source Available.
DS4: Emergency Source Available.
DS5: Engine Exerciser.
PB1: Bypass Time Delay.
PB2: Transfer Switch Test.
PB3: Set Engine Exerciser.
ACC. 11BG ASSY.: Optional module for engine exerciser and source availability signals, mounts on the back of the Operator Interface Membrane.
ASCO OPTIONAL SERIAL COMMUNICATION DEVICE: For remote monitoring and control.
FIELD CONNECTIONS: Points for external wiring, including Source Availability Signals.
FACTORY CONNECTIONS: Internal connections made at the factory.
FLAT CABLE PN 607761: Connects the operator interface membrane to the control panel.

HEATER ACCESSORY: Optional heater for the enclosure.

BONDING STRAP PN 098323-019: For grounding the enclosure.

Note 8: Refers to specific wiring or connection details.

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