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4-14 Modules
SG4000 Installation and Operation Manual
A single SG4-PS power supply provides 2.9 A at +24 V. You can use the test point on the top
panel of the SG4-PS to verify the 24 VDC output. A green LED also on the top panel indicates
that the power supply is functioning properly. If the green LED is not on, the supply is not
producing a 24 V output.
You can use the AC test point on the top panel of the SG4-PS to determine if the unit is
receiving an AC input. If no AC is present, check the AC test point located on the SG4 power
distribution board to verify that AC is reaching the power supply.
The SG4-PS is factory calibrated for 24 V, and no additional voltage adjustment is required.
See Section 3, “Bench Setup and Operation,” Power Supply Operation for additional information
on power supply functions.
Adding Power Supply Modules
The SG4000 power system uses N+1 redundant power supplies that provide forced load sharing.
A single SG4-PS supports the base configuration of four SG4-RF modules, one receiver, one
transmitter, EPIM, and a status monitor transponder.
You can add a second power supply to provide redundancy for the base configuration. As
additional optics modules are added for redundancy or segmentation, a second power supply is
required to support the increased payload. You can add a third SG4-PS to provide redundancy
in configurations requiring two supplies.
The SG4000 power system load sharing design does not support independent AC
powering with two sources.
Table 4-8 identifies the current inputs and outputs for one or more SG4-PS power supplies.
Table 4-8
SG4-PS inputs and outputs
Quantity DC Output
(Amps DC)
44 VAC Input
(Amps rms)
90 VAC Input
(Amps rms)
1 supply 2.9 2.7 2.2
2 parallel – min. load 2.3 2.6 1.7
2 parallel – max. load 5.8 5.1 3.7
3 parallel – min. load 2.3 2.7 1.8
3 parallel – max. load 5.8 5.1 3.7
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