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Description
Yokogawa AEP7D-21 Primary Power Supply Bus Unit
The Yokogawa AEP7D-21, also cataloged as the AEP7D Primary Power Supply Bus Unit, operates as a dedicated hardware component for routing and distributing 220-240 V AC primary power within CENTUM VP and CENTUM 3000 DCS platforms. It provides dual-redundant input lines with isolatable circuits to maintain uninterrupted operation during maintenance.
HardwareSpecifications
Parameter
Specification
ModelBrand
AEP7D-21
Origin
Japan
Weight
Approx. 1.8 kg
Dimensions
Tailored for vertical mount in general-purpose cabinets
OperatingTemp
Standard industrial range (0 to 55 degC)
PowerConsumption
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 distributed lines via shorting jumpers
Process Control Connectivity
The AEP7D-21 maintains channel-to-channel isolation for all distributed outputs to reduce cross-coupling effects between modules. It is fully compatible with 4-20 mA HART loop protocols and supports FOUNDATION Fieldbus and Profibus PA connectivity. Cold junction compensation (CJc) circuitry ensures accurate voltage delivery under varying environmental temperatures, minimizing drift across the bus unit.
Frequently Asked Questions
Q: Does the AEP7D-21 support hot-swapping of modules? A: The unit’s dual-redundant input design allows isolated maintenance of each line. Hot-swap of downstream modules should follow the cabinet’s standard safety and isolation procedures.
Q: What is the recommended maximum load per output port? A: Each output port is rated for a maximum of 6 A. Exceeding this value may trigger protective trip mechanisms or reduce voltage stability.
Q: Can the unit handle transient overvoltages from external sources? A: With a withstanding voltage of 1500 V AC, the bus unit can tolerate standard industrial transients. Surge protection at the cabinet input is advised for extended service life.
Field Installation Guidelines
Mount the unit vertically on the cabinet’s general-purpose DIN rails or mounting panels. Ensure clearance of at least 50 mm from adjacent modules to prevent heat accumulation.
Connect Line A and Line B input sources to separate breakers. Verify isolation before maintenance.
Route output cabling to minimize cross-talk: keep power and signal lines physically separated.
Ground the unit according to ISA G3 guidelines. Use single-point grounding where possible to avoid ground loops.
Confirm that all connections comply with rated current specifications to prevent overloading.
Check for proper ventilation in the cabinet to maintain operating temperature below 55 degC.
