POWER SUPPLY ASSEMBLIES
The MC3 Power Supply is a switching power supply that converts the 90/240 AC voltage input to
DC voltages, without the use of any jumpers. The power supply is mounted on the front of the
slide tray on the Panel Mount enclosure. On the Wall Mount enclosure, the power supply is
mounted under a protective metal panel. With the Door Mount unit, the power supply is normally
attached to the cabinet away from the controller. Both types of power supplies have built in
Power Fail Detect circuits that send a warning to the processor when the input voltage begins to
fail, so that parameters can be saved before the power is lost. The MC3 Power Supply has no
user serviceable parts, such as fuses. In the Panel and Wall Mount controllers, the fuse is
located in the switch assembly. For the Door Mount controller, see the wiring diagram for fuse
located in the panel.
MC
3
DC POWER CABLES
There have been numerous revisions to the DC Power Cable, and some of these are based on
MC
3
CPU Revisions. Below is a drawing that details how the different Cable revisions affect
connecting to the CPU Revisions. The older cables (REV 8 or older) used with Rev 10 or older
CPU boards, had 6 wires and a 6 position connector. The newer cables (Rev 9 or later) used
with Rev 11 or newer CPUs, have 7 wires with a 7 position connector. The additional wire is an
additional +5V signal, added to improve the +5V supply to the CPU Board. If an older cable is
used with this new CPU board, there will be an open pin near the F1 fuse on the board when
mating the connector to the board as shown below. Likewise, if the newer cable is plugged into
the older CPU board, the additional socket of the connector will hang over the header next to the
LED on the CPU board.
WARNING: Connecting these incorrectly will damage the CPU
board and other boards in the card stack.
MC3 Hardware Manual 28
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