Cooper Bussmann BU-905U-L installation manual Relay Outputs, Important Safety Information

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Cooper Bussmann BU-905U-L Wireless I/O Installation Manual

Relay Outputs

The BU-905U-L-R module provides three normally open voltage-free relay contacts rated at 250Vac / 30Vdc 1A.

You can use these outputs to directly control low-powered equipment or power larger relays for higher-powered equipment.

For inductive loads, Cooper Bussmann recommends:

DC relays - use flyback diodes across the external circuit to prevent arcing across the relay contacts.

AC relays – use capacitors (e.g., 10nf 250V) to prevent arcing across the relay contacts.

You can individually configure digital outputs to turn off if no command message is received by the output for a certain period. This feature provides an intelligent watchdog for each output, so communications failure at a transmitting site causes the output to revert to a known state.

The output circuit is connected to the appropriate pair of Digital Output terminals. Each digital output circuit includes a LED indicator that lights when the digital output is active. The LED flashes if the watchdog alarm is active.

IMPORTANT SAFETY INFORMATION

In order to comply with Electrical Safety Standards, when connecting SELV AND voltages which are greater than SELV (30Vac or 60Vdc)

together, then Relay Output 2 must NOT be used in order to provide sufficient isolation between the outputs

3A1580Rev1.6

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Contents Cooper Bussmann BU-905U-L Wireless I/O Installation Manual Cooper Bussmann Application Engineering ContentsFCC Notice when used in USA 905U Wireless I/O Module Safety InformationIndustry Canada BU-905U-L Wireless I/O Module Safety Information FCC NoticeSpecifications Know technical information about your unit Installing Your UnitAbout This Document Section Read this section if you want toTransmitter Unit Unit Components and ConnectionsIndicates Receiver Unit Signal Strength PG LED on Configuration Cable Connected Output LED onLEDs with Rssi Push Button PressedSupported Antennas Installing the AntennaRG58 RG213 Cellfoil Radio Transmission DistancesArea Distance Additional information USA/Canada 20+ miles Australia/NZ 20+ kmCollinear Antennas Installing and Earthing AntennasOmni-directional Antennas 3A1580Rev1.6 Horizontal polarization for the stations Yagi Directional AntennasVertical polarization for the stations With a common stationInstalling the Power Supply Inputs and Outputs Digital InputsConnection Method Voltage free contact Active 0-5v signal deviceRelay Outputs Important Safety InformationStatus Output Status OutputsAnalog Input Wire Transducer Current Source Output Current sink output Thermocouple InputPassive transistor Active pulse device Pulse InputMinimum on time Analog Output Installing and Configuring the Unit Installing the UnitSignals Sent Over Radio Configuring Your UnitsOther Signals SendsTesting Your Units Receiver Unit Unit SpecificationsTransmitter Unit Ancillary Hardware Reference Information Signal Name Normal ColorRS232 Serial Cable Parity No parityIndex ConfigurationConnections ReceiverCooper Bussmann BU-905U-L Wireless I/O Installation Manual Customer Assistance

BU-905U-L specifications

The Cooper Bussmann BU-905U-L is a critical component known for its reliable performance in various electrical applications. This fuse is designed to protect circuits from overloads and short circuits, ensuring the safety and integrity of electrical systems in residential, commercial, and industrial settings.

One of the main features of the BU-905U-L is its high breaking capacity, which allows it to effectively interrupt excessive current flow without damaging connected devices. This feature makes it suitable for use in demanding environments where reliable protection is crucial. The fuse is built to handle transient events, making it ideal for applications subject to short bursts of high current.

The fuse utilizes advanced materials and technologies to enhance its durability and efficiency. Its construction includes a robust, non-combustible housing that offers excellent thermal resistance and mechanical strength. This ensures the fuse can withstand harsh operating conditions while maintaining its protective capabilities. The BU-905U-L is also designed for quick and easy replacement, minimizing downtime during maintenance.

Another significant characteristic of the BU-905U-L is its thoughtful design for ease of installation. It features a standard size that is compatible with various fuse holders, allowing for a seamless integration into existing systems. Additionally, the fuse is marked with clear ratings, enabling users to quickly identify its specifications for proper selection and installation.

In terms of electrical ratings, the BU-905U-L is designed to handle a specific voltage and current, which makes it suitable for a diverse range of applications, including motor protection, lighting circuits, and power distribution systems. These fuses come with various current ratings, offering flexibility for different load requirements.

Moreover, built on a commitment to safety and quality, Cooper Bussmann ensures that the BU-905U-L meets stringent industry standards and certifications. This not only guarantees the reliability of the product but also provides peace of mind to users knowing that their electrical systems are well protected.

In summary, the Cooper Bussmann BU-905U-L fuse combines high performance, advanced material technology, and user-friendly characteristics, making it an invaluable component in any electrical system. Whether for industrial machinery or everyday electrical circuits, this fuse provides essential protection, ensuring safety and reliability in energy management.
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