28VDC Power Distribution Unit

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Product Overview

An Electronic Circuit Breaker Unit/Power Distribution Unit has power inputs from different sources and power outputs to feed the loads. The 28VDC Electronic Circuit Breaker Unit/Power Distribution Unit has voltage and current measurement units. It can also perform detailed tasks such as soft start, over-current protection, short circuit protection, sequential opening and energizing the desired loads for power saving according to working scenarios.

Each Electronic Circuit Breaker Unit/Power Distribution Unit is designed with fail-safe logic that provides a configuration that allows the utilization of input power to the appropriate loads, ensuring that power is retained on essential loads. It has a redundant design that allows the Electronic Circuit Breaker Unit/Power Distribution Unit to prevent single-point failures. Electronic Circuit Breaker Unit/Power Distribution Unit also utilizes WoW (Weight on Wheel) logic, extensive Built-In-Test capabilities and I2T logic.

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Configuration Abilities

• Overcurrent configuration for
output channel

• Load shedding

• Sequential Opening

• I2T limits

• Output Channel ON/OFF Control

• Soft start time

• Overcurrent configuration for
output channel

• Load shedding

• Sequential Opening

• I2T limits

• Output Channel ON/OFF Control

• Soft start time

• Overcurrent configuration for
output channel

• Load shedding

• Sequential Opening

• I2T limits

• Output Channel ON/OFF Control

 

• Overcurrent configuration for
output channel

• Load shedding

• Sequential Opening

• I2T limits

• Output Channel ON/OFF Control

 

Monitoring

• Load Current

• Input Voltage

• Output Voltage

• Each Channel Fault

• Temperature

• Load Current

• Input Voltage

• Output Voltage

• Each Channel Fault

• Temperature

• Load Current

• Input Voltage

• Output Voltage

• Each Channel Fault

• Temperature

• Load Current

• Input Voltage

• Output Voltage

• Each Channel Fault

• Temperature

Protections

• Short Circuit

• Overcurrent

• Overvoltage

• Under voltage

• Reverse voltage

• Soft start

• I2T

• Channel Lock Abilities

• Short Circuit

• Overcurrent

• Overvoltage

• Under voltage

• Reverse voltage

• Soft start

• I2T

• Channel Lock and Block Abilities

• Short Circuit

• Overcurrent

• Overvoltage

• Under voltage

• Reverse voltage

• I2T

• Channel Lock Abilities

• Short Circuit

• Overcurrent

• Overvoltage

• Under voltage

• Reverse voltage

• I2T

• Channel Lock Abilities

• Power Distribution Unit

• Electronic Circuit Breaker

• Current and Voltage Monitoring

• Essential and Non-Essential Load Prioritizing

Interfaces

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Output Channels

48 Channels

(12x10A & 12x20A & 24x5A)

48 Channels

(12x10A & 12x20A & 24x5A)

16 Channel

(4x20A & 12x4A)

16 Channel

(4x20A & 12x4A)

Input Voltage Channels2211
Total Current300A320A120A120A
Discrete Inputs

3 x GROUND/OPEN

2 x 28VDC/OPEN

12 x GROUND/OPEN

6 x 28VDC/OPEN

8 x GROUND/OPEN

4 x 28VDC/OPEN

8 x GROUND/OPEN

4 x 28VDC/OPEN

Discrete Outputs

2 x GROUND/OPEN

1 x 28VDC/OPEN

4 x GROUND/OPEN

2 x 28VDC/OPEN

4 x GROUND/OPEN

2 x 28VDC/OPEN

4 x GROUND/OPEN

2 x 28VDC/OPEN

Communications

1 x Ethernet

1 x RS-485 (Half Duplex)

 

1 x MIL-STD-1553B

1 x RS-485 (Half Duplex)

 

1 x Ethernet

1 x RS-485 (Half Duplex)

 

1 x MIL-STD-1553B

1 x RS-485 (Half Duplex)

Physical AddressUp to 32 AddressUp to 32 AddressUp to 32 AddressUp to 32 Address

 Electrical and Mechanical

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Input Voltage Nominal28V28V28V28V
Operating Voltage Range18V to 32V18V to 32V18V to 32V18V to 32V
Output Voltage28V28V28V28V
Dimension (L x W x H) (mm)341.3 x 275.2 x 100341.3 x 275.2 x 100165.7 x 236 x 39.8165.7 x 236 x 101.2
Weight (g)6500 ± 5006500 ± 5001500 ± 2001500 ± 200

Enviromental

• Operating Temperature: -40°C to +55°C

• Storage Temperature: -40°C to +85°C

• Operating Altitude:  45,000ft

• Atmospheric Pressure: 7.2 kPa to 108.3 kPa

• RTCA/DO-254 

• RTCA/DO-160G 

• MIL-STD-810G 

• MIL-STD-461F 

• MIL-STD-704F 

 

Current Status 

TRL 7/9

What is the 28VDC PDU used in the aviation industry?

In the aviation industry, a 28VDC Power Distribution Unit (PDU) is a critical component used to supply 28V DC (direct current) power to various aircraft systems and ground-based equipment. 28V DC is a common voltage used in aviation, particularly for aircraft electrical systems. This voltage is typically generated by the aircraft's battery or transformer rectifiers and is used to power essential systems, especially when the aircraft is on the ground or during maintenance.

What does the 28VDC PDU used in the aviation industry do?
 

1. Power Distribution:

  • The 28VDC PDU distributes 28V DC power to various electrical systems, ensuring that multiple devices and systems can operate simultaneously. These systems may include lightingcommunicationsavionicspumpselectrical actuators, and aircraft environmental controls.

2. Voltage Regulation:

  • The PDU ensures that the 28V DC power supplied to the systems is stable and consistent, preventing fluctuations that could damage sensitive equipment. This regulation is important for avionics, lighting, and other electronics that require stable power to function properly.

3. Circuit Protection:

  • The PDU includes circuit protection mechanisms, such as fuses or circuit breakers, that safeguard the aircraft systems and equipment from damage in case of electrical faults like short circuits, overloads, or surges. This ensures safety for both the equipment and personnel working around it.

4. Power Conditioning:

  • Some 28VDC PDUs are designed to filter and condition the incoming power. This is important for eliminating electrical noise, transients, or surges that could affect sensitive avionics or communication systems, ensuring they receive clean and stable power.

5. Redundancy and Reliability:

  • In critical applications, 28VDC PDUs may have redundant power supplies or other backup mechanisms to ensure there is no interruption in power. This redundancy is particularly important for safety-critical systems like navigationcommunication, and flight control systems.

6. Centralized Power Management:

The PDU allows for centralized power distribution to different aircraft systems. This simplifies power management, reducing the need for multiple power sources and ensuring that the systems receive the necessary power from a single, controlled point.

 

Applications of the 28VDC PDU in the Aviation Industry:

1. Aircraft Maintenance:

When an aircraft is on the ground for maintenance or servicing, it requires an external power supply to keep various systems operational, such as avionics, flight controls, lighting, and diagnostics tools. The 28VDC PDU is used to provide power to these systems while the engines or APU (Auxiliary Power Unit) are not running.

2. Ground Support Equipment (GSE):

  • 28VDC PDUs are used to power ground support equipment (GSE), such as ground power units (GPUs)air conditioning units, and de-icing machines. These machines often require a 28V DC supply to operate efficiently while servicing an aircraft on the ground.

3. Aircraft Testing:

  • In maintenance facilities or testing environments, 28VDC PDUs are used to power test equipment, simulators, or other diagnostic tools that help ensure aircraft systems are functioning correctly. These PDUs allow testing of aircraft components in a controlled environment, simulating real operational conditions.

4. Emergency Backup Power:

  • During maintenance or when the aircraft is stationary, a 28VDC PDU can provide backup power to critical systems, ensuring that essential operations (like communication and navigation) continue without relying on the aircraft’s onboard power systems.

5. Flight Simulation and Training:

28VDC PDUs are used in flight simulators to replicate aircraft systems and provide the required electrical power for realistic simulation experiences. This is essential for pilot training, as simulators require a constant supply of stable power to operate avionics and other systems.

 

What are the different types of 28VDC PDU used in the aviation industry?

1. Portable 28VDC PDUs:

  • Designed for mobility, these PDUs can be moved to different locations (like on the tarmac or in hangars) to provide power to ground support equipment or for temporary aircraft servicing.

2. Rack-Mount 28VDC PDUs:

  • These PDUs are intended for installation in 19-inch racks and are used in maintenance facilities or testing environments where multiple devices or systems need to be powered centrally.

3. Fixed 28VDC PDUs:

  • Installed permanently in hangarsmaintenance depots, or control rooms, these PDUs provide continuous power to aircraft systems and diagnostic equipment during ground operations.

4. Redundant 28VDC PDUs:

  • These PDUs offer failover protection, ensuring that there is no interruption in power supply, which is crucial for systems like communicationnavigation, and lighting that require continuous power.

5. Smart 28VDC PDUs:

  • These are equipped with intelligent features like remote monitoringdiagnostics, and data logging, allowing operators to monitor the health of the system, track power usage, and receive alerts for any issues.

Conclusion:

The 28VDC Power Distribution Unit (PDU) in the aviation industry plays an essential role in ensuring that critical aircraft systems and ground support equipment (GSE) remain operational, especially when aircraft engines are off or during maintenance. The 28VDC PDU provides stable, reliable, and regulated power to various systems like avionicslightingpumps, and communications, and often incorporates features such as circuit protectionredundancy, and power conditioning. It is vital for maintenance, testing, and aircraft ground support, making sure that systems work properly and safely during these operations.


 

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