American Power Conversion MX28B-400 - Manual (Page 17)

MX28B-400 +24V Product Manual
990-9218 11
4.2 Power Output Capacity
The power supplies a maximum of 400 amps or 300 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.
4.3 Rectifiers
The rectifiers are APC DC Network Solutions Inc. Model MRF28H27BV 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:
27.2 V dc
• = Over-voltage Protection:
Set at 31.5 V dc
• = Output Current per Rectifier:
100A Maximum, Continuous
• = Power Output per Rectifier:
2800W Continuous, Vin > 198V ac
• = Efficiency:
89% 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)
• = Control of either a battery or a load LVD
4.5 AC Input Power
Each rectifier requires 208/220/240V ac, single-phase, 50/60 Hz, supplied through an external
20-amp two-pole breaker. A rear located enclosure, with two holes for customer-supplied one-
inch conduit entry, provides a terminal strip(s) for ac input power connection and a separate
“Earth Ground” bar for connection of the safety ground wire(s).