14 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Redundant units have two identical internal or external power supplies
depending on the option chosen when the order was placed. Non-redun-
dant units have only one internal or external power supply. The 15 Vdc
models have an interface panel and switch on the chassis, but no internal
supply.
AC-Powered Units
AC-powered radios are designed to operate from 115 to 230 Vac
(50-60 Hz). The supply automatically adjusts to match either standard
voltage. However, the supply voltage must be between 90 and 132 Vac,
or 180 to 264 Vac. Operation outside these two ranges might cause
damage to the power supply. A North American-style AC power cord is
supplied with these units. Figure 13 on Page 18 shows the AC power
supply module’s receptacle and switch. Table 4 provides details for the
AC power supply module’s replaceable fuse.
DC-Powered Units
Internal Units Figure 9 shows a rear view of in internal DC power supply. Connection
to the power supply is made with a three-conductor plug-in terminal
strip (Phoenix connector P/N 73-1194A22). The radio operates in either
a positive or negative-ground configuration. The center pin of the
chassis connector is not connected within the radio.
Invisible place holder
Figure 9. Rear View of Master Station, DC Power Input
External Units
External DC-power supplies are available as an option (Figure 10 on
Page 15). Two DC-to-DC power inverters are provided on an open rack
shelf. Each inverter is protected from dust and debris by a clear plastic
cover.
Table 4. AC Power Supply Module Fuse
Part Description Part No.
Replaceable Fuse
on AC Power
Supply Module
Fuse, 5x20mm Glass 3.15A 250V 29-2130A06
Replaceable Fuse
on Battery Control
Assembly
Fuse, 3AG Fast .25x1.25 250V 1A 29-1064A06
ON/OFF SWITCH
DC POWER INPUT
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