8MX28B
4.2 Power Output Capacity
The power plant has two basic configurations:
The first supplies a maximum of 200 amps or 150 amps with N+1 redundancy. The housing
for this configuration provides space for one rectifier shelf that can hold up to four rectifiers,
a control unit, and one tier of up to 24 distribution circuit breakers.
The second supplies a maximum of 400 amps or 350 amps with N+1 redundancy. The
housing for this configuration provides space for two rectifier shelves that can hold up to
four rectifiers each, a control unit, and one tier of up to 24 distribution circuit breakers.
The difference between the 200 and 400 amp units are the side plates and an additional
rectifier shelf; all other parts are the same for both configurations.
4.3 Rectifiers
The rectifiers are Advance Power, Inc. Model MRF28H54BV with specifications as follows:
• Input Voltage: 176-264V ac (230V ac nominal) @ 45-66 Hz
• Input Current per Rectifier: 13.9 Amps @ 230V ac
• Apparent Power Factor: 99% Typical, 98% Minimum
• Output Voltage: 54.5V dc
• Overvoltage Protection: Set at 59.5V dc
• Output Current per Rectifier: 50 Amps Minimum Continuous
• Power Output per Rectifier: 2800W Continuous, Vin > 198V ac
• Efficiency: 91% Typical
• Cooling: Fan cooled, front to rear airflow
• Ambient Temperature: -25°C to 65°C Operational
4.4 Control Unit
The microprocessor-based power system control unit is 1U high (1.75”) and provides
control and monitoring functions. Features implemented are:
• 32-character alphanumeric display
• LED alarm and status indicators
• Standard voltage and battery charging control
• Battery temperature compensation (optional)
• Monitoring of up to two shelves of four rectifiers each
• Individual alarm monitoring of 24 breakers
• Eight alarm / annunciation relays (Major, Minor, and six user defined) with form C
contact outputs
• Four external alarm inputs (either N.O. or N.C. contacts)