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MX28B-1200+27V PRODUCT MANUAL Rev 1
14
5.1.7 Ventilation
The rectifiers have fans that provide front to rear airflow for internal cooling. The MX28B1200
housing should mounted to allow free airflow from the front and out the top of the unit. [Refer to
Section 4.10 for environmental characteristics.]
5.2 AC Service and Ground Connections
***** WARNING *****
Ensure that all of the DC and external AC circuit breakers are in the OFF position prior to
connecting service to the power plant. Confirm that all voltages have been removed including
any battery sources before proceeding.
The MX28B DC power plant requires the supply of 208/220/240V AC, single-phase, 50/60 Hz power
through individual external 80-amp circuit breakers to the AC input terminal block connections for
each rectifier shelf the system. Each rectifier shelf has four 20-amp breakers, each serving one
rectifier. The AC Grounding wiring, from the Earth terminal block to the individual shelves is factory
installed for each shelf installed. Connections to the AC input connector for each rectifier, is factory
installed.
Figure 5-2 AC Wiring conduit
Figure 5-3 AC Wiring Terminal
AC Grounding
wires