Series 300 Microprocessor Controller

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.

Fig. 7: ASCO Series 300 Microprocessor Controller

Voltage & Frequency Sensing

lAdjustable three-phase, close-differential voltage sensing on normal source.

lNormal source pickup voltage is adjustable to 95% of nominal; drop-out is adjustable from 70% to 90% of nominal.

lFrequency sensing on emergency source. Pickup at 95% and dropout at 85% of nominal.

Time Delays

lAdjustable time delay to override momentary normal source outages to delay all transfer switch and engine- starting signals.

lTransfer to emergency time delay—Adjustable from 0 to 5 minutes for controlled timing of load transfer to emergency.

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

engine generator cool down.

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

Fig. 8: Door-Mounted Control & Display Panel

Control and Display Panel

lEasy-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.

Standard Selectable Features

lInphase monitor to transfer motor loads, without any intentional off time, to prevent inrush currents from exceeding normal starting levels.

lEngine exerciser to automatically test backup generator

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

lSelective 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.

l60 Hz or 50 Hz selectable switch.

lThree-phase/single-phase selectable switch.

Remote Control Features

Terminal provisions for connecting:

lRemote test switch.

lRemote 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.

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Emerson 300 Series manual Series 300 Microprocessor Controller
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300 Series specifications

The Emerson 300 Series is a notable line of instrumentation devices designed to cater to the needs of modern industrial applications. This series features advanced technologies that facilitate precise measurements and improved operational efficiency, making it a preferred choice for various sectors, including oil and gas, pharmaceuticals, and food and beverage.

One of the main highlights of the Emerson 300 Series is its robust design, which ensures durability and reliability even in the most challenging environments. The devices are equipped with weather-resistant housings, allowing for outdoor installations without compromising performance. This ruggedness is complemented by a user-friendly interface that simplifies operation and maintenance, enhancing overall user experience.

The series employs cutting-edge sensor technology, allowing for highly accurate and real-time data collection. This is particularly critical in applications where precision is paramount. The sensors are designed to minimize drift over time, thereby reducing the need for frequent recalibrations, which can be both time-consuming and costly.

Another significant feature of the Emerson 300 Series is its integration capabilities. These devices can seamlessly connect to existing industrial automation systems, ensuring smooth data flow and interoperability between different components. This capability is essential for maintaining an efficient workflow and improving overall productivity.

The series also incorporates advanced diagnostics and predictive maintenance features. This not only helps in identifying potential issues before they escalate into significant problems but also facilitates timely maintenance, reducing downtime and enhancing operational efficiency. Users benefit from enhanced visibility into system performance, allowing for informed decision-making.

Additionally, the Emerson 300 Series supports various communication protocols, making it adaptable to diverse industrial environments. Whether it's through analog outputs, digital protocols, or wireless communication, the series provides flexibility that meets the demands of modern process control systems.

In summary, the Emerson 300 Series stands out with its combination of rugged design, advanced sensor technology, seamless integration capabilities, and predictive maintenance features. These characteristics make it an invaluable tool for industries that require high reliability and accuracy in process measurement and control. As industries continue to evolve, the Emerson 300 Series remains at the forefront, providing solutions that help businesses achieve their operational goals efficiently and effectively.
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