Power Output Capacity, Rectifiers, Control Unit

Revision B

MX28B-1200 PRODUCT MANUAL

4.2Power Output Capacity

A single power box frame consists of six rectifier shelves, each shelf accommodating up to four hot-plug, 50 amp rectifiers. A completely configured power frame with 24 rectifiers is rated at 1200 amps. Each additional power frame will add up to 1200 amps for a maximum total of 2400 amps using 48 rectifiers. A single master control unit in the first power frame provides control and monitoring for the entire system.

4.3Rectifiers

The rectifiers are APC 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

4.4Control 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 (2 lines by 16 characters)

•LED alarm and status indicators

•Standard voltage and battery charging control

•Battery temperature compensation (optional temperature probe)

•Monitoring of up to 18 shelves of four rectifiers each

•Individual alarm monitoring of 72 breakers

•Individual alarm monitoring of ten power distribution fuses

•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)

•Control for two independent Low Voltage Disconnects (LVD’s)

MX28B-1200/2400