Miranda NV5100MC Master Control, Reference Manual

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NV5100MC Master Control • Reference Man ual 29
3. Frames
Connectors
For increased protection against loss of power, we suggest that each power supply be connected to
a separate branch circuit. A removable wire bail grips the power cable and hold it in place to reduce
the possibility of accidental loss of power.
The power cords represent the only means of disconnecting main power from the frame. Make sure
to clearly mark the line side power connection with its function so that in the event of an emer-
gency, power can be disconnected quickly. Disconnect both power cords before servicing any inter-
nal frame components.
Power Supply
The PS6100
4
power supply accepts a wide range of AC input voltages and produces five +48 VDC
outputs. Each of the five circuits producing the +48 volt outputs is identical. The power supply
automatically senses the AC input voltage (90–130VAC or 180–250VAC) and adjusts itself to
maintain a relatively constant DC output. You do not have to select the voltage. The five regulated
outputs are directed to the various regulators that produce the DC voltages required by the local cir-
cuits.
Each +48VDC output powers one of the five green LEDs and output test points on the front of the
power supply. Under normal operation, all five LEDs should be on. If any is not, it is likely that the
corresponding branch circuit has failed. When the power supply output voltages are measured at
the test points, the voltage should be approxi48 VDC under a full load. If modules have
been removed from the frame or options are not installed, some or all of the test point voltages
could be somewhat higher than +48VDC.
There are four low-speed fans located at the front edge of the power supply. They pull a small quan-
tity of air across the internal heat sinks.
The top power connector on the rear panel corresponds to the power supply on the left and the bot-
tom connector corresponds to the power supply on the right (as you face the front of the frame).
Ground Lug
At the lower left portion of the rear of the frame is a ground lug:
Connect this “lug” to earth ground using 8–14 AWG wire.
4. Older master control frames in the field might still use PS6000 power s upplies.
Ground Lug