GE Fanuc DS3828BH5AR | Power Supply Board | Fast Ship

Description

Product Introduction

The GE DS3828BH5AR is a high-capacity power supply module with redundant input capability for the Speedtronic Mark V turbine control system, providing regulated DC power distribution for critical chassis applications requiring enhanced power reliability. This board mounts directly into the Mark V rack, converting nominal 125 VDC plant battery power into isolated, regulated DC voltages with higher current capacity and the ability to accept redundant DC input feeds.

The “BH5AR” designation indicates a power distribution module with high output capacity (150W) and redundant input capability—the “R” suffix signifies redundant input power connections. This board provides +5 VDC, ±15 VDC, and +24 VDC outputs with increased current ratings, and features dual DC input terminals that allow connection to two independent 125 VDC power sources (typically two separate battery banks or rectifier feeds). If one input source fails, the board automatically switches to the other source without interrupting power to the chassis. The DS3828BH5AR is designed for critical Mark V chassis configurations where power reliability is paramount.

Key Technical Specifications

Key Selling Points & Differentiators

• Redundant input capability. Two independent 125 VDC inputs with automatic seamless switchover (<10ms)—ensuring chassis power remains uninterrupted if one DC source fails.
• High output capacity. 150W total output—50% more than BH3A series—for densely populated chassis configurations.
• Increased current ratings. +5V at 15A, ±15V at 3A, and +24V field at 2A.
• Automatic source switchover. If primary input fails, secondary input is engaged within 10ms with no output interruption—transparent to the chassis.
• Dual input status indication. Red LEDs for each input source indicate presence/absence of DC power, and a green LED shows which source is currently active.
• Complete chassis power solution. Provides all required voltages for Mark V modules in a single slot.
• Overload protection. Individual current limiting on each output with auto-recovery.
• Input transient protection. MOV surge suppression on both input channels.
• Thermal monitoring. Overtemperature shutdown protects against excessive cabinet heat.
• 48-hour burn-in at full load with redundant switching tests. Every unit is tested for 48 hours at full load, with multiple input switchover cycles verified.
• 18-month warranty covering output regulation, redundant switchover function, and protection circuits. If the board fails to switch over properly or outputs drift, we replace it.

Frequently Asked Questions (FAQ)

Q: What does the “R” suffix mean on the BH5AR?

A: The “R” suffix indicates redundant input capability. The board has dual input terminals (A and B) that connect to two independent 125 VDC power sources. If one source fails, the board automatically switches to the other within 10ms without interrupting power to the chassis.

Q: What is the difference between the BH5A and the BH5AR?

A: The BH5AR adds redundant input capability—dual DC input terminals with automatic switchover. The BH5A has a single DC input. Output specifications (voltages, currents, total power) are identical between both variants.

Q: How does the redundant input switchover work?

A: The board continuously monitors both input sources. It defaults to the primary source (A) while the secondary (B) is in standby. If input A drops below approximately 95V (undervoltage lockout), the board switches to input B within 10ms. The switchover is seamless—there is no interruption to the output voltages. When input A is restored, the board automatically switches back to A (unless configured otherwise).

Q: Can I configure which input is primary?

A: Yes—there is a hardware selector on the board (jumper or dip switch) that allows you to set the primary source. The default is input A as primary. If you prefer B as primary, you can adjust this during installation. The board will always prioritize the selected primary source when both are available.

Q: If both inputs fail, how long will the outputs stay up?

A: The BH5AR does not include internal energy storage (batteries or large capacitors). If both inputs fail simultaneously, the outputs will drop immediately. The board relies on external DC power sources (plant batteries) for ride-through. For extended backup, ensure your plant DC sources are sized appropriately.

Q: Is the BH5AR a direct replacement for the BH3A or BH5A?

A: Yes—mechanical and electrical compatibility is 100%. Same form factor, same DIN connector, same pinout, same field wiring for outputs. However, the BH5AR requires connection to both DC input sources to utilize the redundancy feature. If you’re replacing a single-input BH3A/BH5A and don’t have a second DC source available, you can simply connect input A and leave input B disconnected—the board will operate as a standard single-input power supply.

Q: What happens if I only connect one input source?

A: The board will operate normally using the single connected source. The red LED for the unconnected source will illuminate (indicating fault), but this does not affect operation. The board will not attempt to switch to the disconnected source.

Q: Does the BH5AR require forced-air cooling?

A: Yes—the BH5AR is rated for operation with forced-air cooling (200 LFM minimum). Operating without adequate airflow can cause overtemperature shutdown.

Q: What is the input voltage range for each source?

A: Each input is rated for 100-140 VDC nominal (125 VDC nominal). The board’s undervoltage lockout is approximately 95V for each input. If input voltage drops below 95V, that source will be considered failed, and the board will switch to the other source.

Q: Does the BH5AR have short-circuit protection on the outputs?

A: Yes—each output has current-limiting protection. If a short circuit occurs, the output current will be limited to a safe value, and the board will auto-recover when the short is removed.

Q: What is the warranty on the BH5AR?

A: 18 months from shipment, covering output regulation, redundant switchover function, protection circuits, and component reliability. If the board fails to switch over properly or outputs drift, we replace it. The warranty does not cover physical damage or miswiring.

Q: Do you have many BH5AR boards in stock?

A: The BH5AR is a specialized variant with limited production. We typically have 2-4 units in stock. If you need larger quantities, contact us directly to confirm availability. This board is critical for applications requiring redundant DC input power—we recommend securing your requirements while stock remains.

Q: Can the BH5AR be used with a single DC source as a standard power supply?

A: Yes—simply connect one input source (A or B) and leave the other disconnected. The board will operate identically to a BH5A with the only difference being the unused input LED. However, this use case does not justify the premium of the BH5AR—use a BH5A or BH3A for single-input applications.

ABB NBRA-659C 59006436
SCHNEIDER ATS48C41Q
A-B 1756-L62
A-B 1326AB-B410G-21