Delta MCS-600 Power Shelf
Installation, Operations and
Maintenance Manual
REV.: 03
3-1
Customer Specification Confidential
3 Power Supply Unit (PSU)
3.1 Description
This rectifier units are rated at 10 Amps at –48 VDC when operated from high line. For Low operation, the
output is derated to 5 Amps. This derating is automatically activated from the Alarm Control Unit (ALU).
However, the rectifier can operate on a stand-alone basis, if this ALU is removed or nonfunctional.
Warning: In the absence of the ALU, the automatic derating of the rectifiers at Low Line is not effective.
Exceeding the 50% load limit at Low Line may damage the rectifiers.
The modular design provides the flexibility to configure and expand the system as the load demand increases.
Each rectifier unit is swappable with front access for ease of maintenance without system shutdown, providing
uninterrupted service.
The rectifier unit has an active power factor correction of greater than 0.99 for maximum AC utilization. Each
module is equipped with an AC switch located at the front of the module.
3.2 Specifications
Detailed rectifier specifications are provided in the following sections.
3.2.1 Electrical
Detailed electrical specifications for the rectifier are provided in this section.
3.2.1.1 Input
Table 5 displays the rectifier input specifications.
Table 5 Rectifier Input Specifications
Specification Value
Input Voltage
90 VAC to 275 VAC, Single Phase, (during 175 to 120 VAC
derated to 70% Load, during 120 to 90 VAC derated to 50%
Load)
Input Current
4 Amps at 176 VAC, Full Load
Line Frequency
45 to 65 Hz
Power Factor
>0.99, at 220 VAC Input, Full Load
THD
<5%, at 220 VAC Input, Full Load
Efficiency >90%,
Full
Load
Inrush Current
<9 Amps (peak), 220 VAC, Full Load, Cold Start
Start Time Delay
(Walk-In)
3 to 10 seconds
Protection Fuse
3.2.1.2 Output
Table 6 displays the rectifier output specifications.
Table 6 Rectifier Output Specifications
