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SECTION 2 |
Fuse Replacement
Ensure properly rated fuse (250V, 4A) is used in each of the modules.
Environment
DO NOT expose power supply to rain, snow or water spray
Dis-assembly And Repair
The power supply should be disassembled or repaired by a qualified technician. Incor-
rect reassembly or repair may result in a risk of electric shock or fire which may result in
personal injury and property damage.
Description
This is a 19", 2U height (3.5") Rack mount power supply which converts 120V,
60 Hz AC power into regulated 28 VDC , +/- 1% (at module output*) delivering up to a
maximum of 50A continuous (up to 57.5A surge) with 5 base level PCB modules. There
is provision to connect the power supply to an external battery for backup power in the
case of an AC power failure and re-charge the battery when AC power resumes.
* Voltage at output terminals load + & load - will be 27.6V nominal
Applications
The unit is designed for the following applications:
1. N+1 redundant systems
2. Future power level expansion
3. Un-interrupted DC output when used in conjunction with an external battery backup.
SECTION 3 |
The unit is designed using advanced switch-mode technology and active load share cir-
cuitry for high reliability, high efficiency and minimum size and weight. It is modular in
construction consisting of up to 5 base level PCB modules (referred to as "PSM" – power
supply module) that are connected in parallel with true current sharing. Each PSM is a
stand alone power supply which delivers up to a maximum of 10A continuous. By equal-
izing the output currents, uniform thermal stress of the individual PSM is ensured which
has utmost importance for long term reliability of electronic components. The operat-
ing principle of the current share mechanism is to measure the output current of each
PSM and to be able to modify the output voltages of the PSMs until all the participating
6 | SAMLEX AMERICA INC.
Description & Applications
Design & Principle of Operation
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