The Yokogawa AEP7D-21 Power Supply Bus Unit is a high-capacity, industrial-grade power distribution unit designed for Yokogawa’s distributed control systems (DCS). It delivers stable and regulated DC power to multiple I/O and processing modules, ensuring uninterrupted operation of critical control functions in demanding industrial environments.

Engineered for maximum reliability, the AEP7D-21 supports high-current applications and includes comprehensive protection features such as overcurrent and short-circuit protection. Its robust design ensures minimal voltage ripple and noise, providing precise power delivery for both analog and digital modules. This unit is widely employed in power plants, chemical processing, oil & gas, and large-scale industrial automation systems.

Product Specifications

Product Applications

The AEP7D-21 Power Supply Bus Unit is widely used in industrial automation for reliable power distribution:

• Distributed Control Systems (DCS) – Supplies regulated power to analog and digital I/O modules.

• Power Generation Facilities – Supports high-current control modules for turbines, generators, and auxiliary equipment.

• Chemical and Petrochemical Plants – Provides stable power for critical process instrumentation.

• Oil & Gas Operations – Maintains reliable power for field signal acquisition and control modules.

• Large-Scale Manufacturing – Powers multiple high-density module racks.

• Critical Automation Systems – Ensures uninterrupted operation in safety-critical and high-availability environments.

Product Advantages

• High Current Capacity – Supports up to 15 A per bus line, suitable for high-demand racks.

• Stable Voltage Output – Maintains minimal ripple (<50 mV) for precise module operation.

• Comprehensive Protection – Includes overcurrent and short-circuit protection per channel.

• Redundant Operation – Can be configured in parallel with other units for system redundancy.

• Modular Integration – Fits Yokogawa DCS racks for plug-and-play operation.

• Multi-Voltage Support – Provides 5 V DC and 24 V DC for different module types.

• Compact and Rugged Design – Efficient form factor for industrial environments.

• Standard Compliance – Fully compliant with IEC/EN EMC and safety regulations.

FAQ

1. What output voltages does the AEP7D-21 provide?

   It provides regulated 5 V DC and 24 V DC depending on system configuration.

2. What is the maximum output current per bus line?

   Up to 15 A per line for high-demand applications.

3. Does the unit include overcurrent protection?

   Yes, each channel has built-in overcurrent protection.

4. Is short-circuit protection included?

   Yes, all output channels are protected against short circuits.

5. Can it power both analog and digital modules simultaneously?

   Yes, it distributes power to all connected modules via the DCS backplane.

6. What is the input voltage range for this unit?

   100–240 V AC, 50/60 Hz.

7. How is voltage ripple controlled?

   The unit maintains <50 mV peak-to-peak ripple using regulated circuitry.

8. Can multiple units be connected for redundancy?

   Yes, parallel configurations are supported for high-availability systems.

9. What operating temperature range is supported?

   0–55 °C for normal operation.

10. Does the unit comply with international EMC and safety standards?

    Yes, it meets IEC/EN EMC and electrical safety requirements.