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Description
Yokogawa AEP7D-20 Primary Power Supply Bus Unit
The Yokogawa AEP7D-20, also cataloged as the AEP7D Primary Power Supply Bus Unit, operates as a dedicated hardware component for distributing primary AC power across CENTUM VP and CENTUM 3000 series DCS cabinets, ensuring dual-line redundancy and uninterrupted power delivery.
Hardware Specifications
Parameter
Specification
ModelBrand
AEP7D-20
Origin
Japan
Weight
Approx. 1.8 kg
Dimensions
Standard Yokogawa cabinet mounting (vertical type)
OperatingTemp
0 degC to 55 degC (typical industrial range)
PowerConsumption
Dependent on load; Max input current 20 A total, 6 A per port
InputVoltage
220 V AC to 240 V AC (±10%)
InputFrequency
50 / 60 Hz (±3 Hz)
WithstandingVoltage
1500 V AC
OutputPorts
Up to 14 connections (parallel setups)
DCS Power Distribution Features
Supports dual-redundant input lines (Line A and Line B) for uninterrupted operation.
Independent maintenance for each line without halting system functions.
Channel-to-channel isolation minimizes interference between power distribution paths.
High-density bus design allows multiple sub-ports while maintaining voltage stability.
Built-in cold junction compensation ensures voltage reference stability under temperature variations.
Frequently Asked Questions
Q: Can the AEP7D-20 be hot-swapped without shutting down the DCS? A: Hot-swap is not recommended for the AEP7D-20; maintenance should be performed on one line while the redundant line remains active.
Q: What is the maximum load per output port? A: Each output port is rated for 6 A maximum; total unit load should not exceed 20 A.
Q: Are firmware updates required for this power supply unit? A: The AEP7D-20 operates as a hardware bus unit without embedded firmware; no firmware updates are necessary.
Field Installation Guidelines
Mount vertically in standard Yokogawa cabinets (AFV40 series or ACB51).
Ensure proper grounding of all input and output terminals to reduce electrical noise.
Maintain separation between Line A and Line B cabling to preserve isolation.
Verify that all sub-port connections do not exceed rated per-port current.
Follow standard industrial practice for cabinet ventilation to maintain operating temperature below 55 degC.
