Guardian 3U / MS27 / 5 POS

48V 50A ~ 250A DC Power System

DESCRIPTIONS

Guardian Access 3U is a 3RU high 19” rack-mounted, integrated DC power system providing an output of -48VDC. These systems can accommodate up to 5 Guardian family high efficiency hotswap rectifiers. A total load current of 200A is available with battery charge current up to 100A in addition.

The rectifiers are internally fan cooled with speed control which is a function of load and temperature, keeping acoustic noise to a minimum. The DC output circuits can provide up to 13 loads which utilize circuit breakers rated from 4A to 150A plus up to three 80A, 100A or 125A breakers that provide battery protection.

A programmable low voltage battery disconnect (LVBD) is available with options of 125A or 200A; while a partial load disconnect (PLD), rated at 125A and also programmable, can provide noncritical load shedding when operating on batteries. The ACC Extended remote access controller monitors system parameters, controls rectifier output, and provides alarms for system failures.

The Controller Module is also pluggable for easy field replacement in case of failure. There are 2 LED alarm indicators which indicate failures, (RED) Alarm and (YELLOW) Message. A third green LED indicates the controller is working properly. As standard four form-C relay outputs provide the alarms for remote use. An additional 6 can be included as an option. Two digital inputs and outputs are also provided as well as a microSD card slot that accepts an up to 4GB card which is sufficient for more than 20 years data logging.

The system can be programmed by means of a remote PC web page display. Communication is by Ethernet LAN with SNMPv3 including alarm trapping. It also has provision for temperature compensated charging of an external battery using a supplied TC probe. An LCD Display/Touchpad is included for local metering, status, and setup.

KEY FEATURES

• Selectivity
• 96% Efficiency Rectifiers
• 300A / 14.5kW Total Capacity
• Remote Monitoring & Control
• Field Replaceable Controller
• Ethernet Comm. with SNMPv3
• 3 LED Alarm/Status Indicators
• Up to 10 Form-C Relay Alarms
• Up to 13 Load Breakers
• Up to 3 Battery Breakers
• LCD Display/Touchpad
• Easy Installation