Emerson ASCO 300 User Manual

Power Transfer Switches

Series 300

We Keep Your Power On

ﬁ

Where would you be without a constant

flow of electrical power? We often take for

granted that power will always be around

when we need it. In reality, power failures

are very common. And when the power

goes out, your business suffers. Power

failures are unpredictable. They can occur

at any time and for any number of reasons—

a bolt of lightning, a power surge, a

blackout, an accident or even equipment

failure. They come without warning and

often at the most inconvenient times.

It s for this reason that many businesses

and other entities have invested in

emergency power backup systems.

Typically, the system consists of an engine

generator and an automatic transfer switch

(ATS) which transfers the load from the

utility to the generator.

An ATS with built-in control logic monitors

your normal power supply and senses any

interruptions. When the utility power fails,

the ATS automatically starts the engine and

transfers the load after the generator has

reached proper voltage and frequency. This

happens in a matter of seconds after the

power failure occurs. When the utility power

has been restored, the ATS will automatically

switch the load back, and after a time delay,

it will shut down the engine. With an

Automatic Transfer Switch, you are protected

24 hours a day, seven days a week.

Power Outage Protection

Telecom

In the telecommunications industry, providing a high level of service and dependability is crucial. Lost power means an interruption in service for your customers and lost business for your company. For instance, with cell sites scattered across a wide geographical region and in many remote areas, the chances of an interruption in power are increased, making Automatic Transfer Switches a valuable resource at each location. To maintain dependable service, each cell site must be monitored 24 hours a day. This can be very difficult without some type of remote monitoring and testing capability. The Series 300 Transfer Switch, combined with ASCO s monitoring and control management system, is a cost-effective, packaged solution which can help meet both of these challenging objectives without a major investment at each cell site. With ASCO s connectivity solutions you can remotely monitor and control numerous sites from around the corner or around the world.

Commercial/Retail, Light Industrial

The retail industry is very competitive. An electrical power failure can have a dramatic impact on a retailer s bottom line. If power is interrupted during peak shopping times, the effect could be extremely damaging to present and future business. A power interruption will not only suspend shopping, it can also create safety problems, result in lost transaction data, lost account information and damage to data collection equipment. In addition, retailers who rely on controlled climates to protect valuable inventory could suffer even greater losses, especially if the power failure occurs at a time when no one is available to rectify the situation. To avoid any of these power outage problems, simply install a backup generator with an ASCO Series 300 Transfer Switch and power outage concerns will be a thing of the past.

Municipal

The ASCO Series 300 Transfer Switch can be a critical component of a municipal government s emergency power backup system. Residents of townships, cities and counties rely on police, fire, ambulance/first aid and other critical public sector services. An interruption in power would affect the ability of emergency services to effectively respond to the needs of the community. When time is a critical factor, such as when responding to a fire alarm or an emergency call, an ASCO Series 300 Transfer Switch can be a lifesaver, switching power to the backup generator. While not all municipal services are a matter of life and death, they are always expected to be there.

Agriculture

Maintaining electrical power is vital to an agriculture operation. If the flow of power is interrupted, your operation could be at risk unless the backup generator is quickly activated. A prolonged power outage can affect numerous aspects of the operation, from housing and feeding livestock to processing and producing the end product. With an ASCO Series 300 Transfer Switch, power will automatically be transferred over to your backup generator, eliminating the need to manually switch from utility to generator. When power is restored, the ASCO Series 300 Transfer Switch will, after an adjustable time delay to allow for utility stabilization, automatically switch the load back to the utility service.

Series 300 Power Transfer Switches Typical Applications

There s no danger of the Series 300 ATS transferring loads to a dead source because the unique ASCO single-solenoid operator derives power to operate from the source to which the load is being transferred.

Easy-to-read flush-mounted control and display

panel provides LED indicators for switch position and source availability. It also includes test and time-delay bypass switches as standard features.

Standard engine exerciser for weekly automatic testing of engine generator set with or without load.

Adjustable time-delay feature prevents switch from being activated due to momentary utility power outages and generator dips.

Supplied with solid neutral termination. Optional switched neutral pole available.

Accessory kits available.

Available for immediate delivery.

Now available for service entrance applications. Contact ASCO for assistance.

UL Listed Withstand & Close-On Ratings

Maximum Reliability & Excellent Value

With a Series 300 Transfer Switch, you get a product backed by ASCO Power Technologies, the industry leader responsible for virtually every major technological advance in the Transfer Switch industry.

The ASCO Series 300 was designed for one purpose–to automatically transfer critical loads in the event of a power outage. Each and every standard component was designed by ASCO engineers for this purpose.

The rugged construction and proven performance of the ASCO Series 300 assure the user of many years of complete reliability. The Series 300 is even designed to handle the extraordinary demands placed on the switch when starting or restarting stalled motors and switching high inrush loads.

ASCO s Series 300 modular, compact design makes it easy to install, inspect and maintain. All parts are accessible from the front so switch contacts can be easily inspected.

Features

The Series 300 is listed to UL 1008 standard for Transfer Switch Equipment and CSA standard C22.2 for automatic transfer switches.

Meets NFPA 110 for Emergency and Standby Power Systems and the National Electrical Code (NEC) Articles 700, 701 and 702.

30 through 3000 amps in a compact design.

Available to 600 VAC, single or three phase.

True double-throw operation: The single solenoid design is inherently interlocked and prevents contacts from stopping between sources or from being in contact with both sources at the same time.

Series 300 Power Transfer Switches

Fig. 1: ASCO Power Transfer Switch rated

200 amperes shown in Type 3R enclosure

30 - 200 200,000 480v/60Hz 22,000

230 100,000 480v/60Hz 22,000

260, 400 200,000 480v/60Hz 42,000

600,800,1000,1200

200,000 600v/60Hz 65,000 1600, 2000 200,000 600v/60Hz 85,000 2600, 3000 200,000 600v/60Hz 100,000

Switch Ratings

amps

Available Symmetrical Amperes RMS

When Used

With Current

Limiting Fuses

Maximum

Voltage

When Used

With Specific

Circuit Breakers

@ 480V/60Hz

Notes: 1. Current – limiting fuse should be Class J type through 400 amps:

use Class L type above 400 - amp fuse rating

2. Refer to publication 1128 for specific manufacture’s breakers

Fig. 2: ASCO Power Transfer Switch

rated 200 amperes

Fig. 3: ASCO Power Transfer Switch

rated 400 amperes

Fig. 4: ASCO Power Transfer Switch

rated 1000 amperes

Fig. 6: ASCO Power Transfer Switch

rated 3000 amperes

Fig. 5: ASCO Power Transfer Switch

rated 2000 amperes shown in Type 3R enclosure

Designed to Fit Anywhere

The ASCO Series 300 product line represents the most compact design of automatic power transfer switches in the industry. With space in electrical closets being at a premium, the use of wall or floor-mounted ASCO Power Transfer Switches assures designers optimum utilization of space.

All transfer switches through 2000 amps are designed to be completely front accessible. This permits the enclosures to be installed flush to the wall and still allows installation of all power cabling and connections from the front of the switch. Cable entrance plates are also standard on the 1600 and 2000 amp units to install optional side-mounted pull boxes for additional cable bending space.

Control and Display Panel

l Easy-to-read flush-mounted control and display panel

provides LED indicators for switch position and source availability. It also includes test and time-delay bypass switches.

Voltage & Frequency Sensing

l Adjustable three-phase, close-differential voltage sensing

on normal source.

l Normal source pickup voltage is adjustable to 95% of

nominal; drop-out is adjustable from 70% to 90% of nominal.

l Frequency sensing on emergency source. Pickup at 95%

and dropout at 85% of nominal.

Time Delays

l Adjustable time delay to override momentary normal

source outages to delay all transfer switch and enginestarting signals.

l Transfer to emergency time delay—Adjustable from 0 to 5

minutes for controlled timing of load transfer to emergency.

l Retransfer to normal time delay—Adjustable to 30 minutes. l Five-minute unloaded running time delay for emergency

engine generator cool down.

Four-second time delay to ignore momentary voltage and frequency transients during initial genset loading.

Standard Selectable Features

l Inphase monitor to transfer motor loads, without any

intentional off time, to prevent inrush currents from exceeding normal starting levels.

l Engine exerciser to automatically test backup generator

each week Includes control switch for testing with or without load.

l Selective load disconnect, double-throw contact to operate

at an adjustable 0 to 20 second adjustable time delay prior to transfer and reset 0 to 20 seconds after transfer.

l 60 Hz or 50 Hz selectable switch. l Three-phase/single-phase selectable switch.

Remote Control Features

Terminal provisions for connecting:

l Remote test switch. l Remote contact for test or for peak shaving applications.

Circuit will be automatically bypassed if emergency source fails.

l Inhibit transfer to emergency. l Remote time-delay bypass switch.

Series 300 Microprocessor Controller

Fig. 7: ASCO Series 300

Microprocessor Controller

Fig. 8: Door-Mounted Control & Display Panel

The ASCO Microprocessor Controller is used with all sizes of Power Transfer Switches. It represents the most reliable microprocessor controller in the industry and includes, as standard, all of the voltage, frequency, control, timing and connectivity functions required for most emergency and standby power applications.

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