Guardian Central

48VDC 1350A ~ 6750A DC Power System

Description

Guardian Central is a multi-cabinet integrated DC power system providing an output of -48VDC. Each 2.1m high cabinet can accommodate up to 24 Guardian family high efficiency hot-swap rectifiers along with AC input and DC output distribution. A load current of 1100A plus 250A for battery charge is available from each cabinet with a maximum system capacity of 5500A when 5 cabinets are connected in parallel. The rectifiers are internally fan cooled with speed control which is a function of load and temperature, keeping acoustic noise to a minimum.

Each cabinet can provide up to 4 bulk DC outputs at 384A or 600A via fuses or MCBs. Additionally a maximum of 72 lower current distributed outputs are available via MCBs rates from 6A to 63A. Batteries are protected by a combination of an 1100A low voltage battery disconnect (LVBD) and fuses or alternatively using MCBs. In both cases a 1500A shunt is used to measure battery current both while charging and discharging.

Matching load distribution cabinets allow for extra DC output distribution with the same options as for the main system cabinets. 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

• 92.5-96% Efficiency Rectifiers
  
• 1100A / 59kW Cabinet Load Capacity
  
• 5500A / 294kW Total Load Capacity
  
• Remote Monitoring & Control
  
• Field Replaceable Controller
  
• Ethernet Comm. with SNMPv3
  
• 3 LED Alarm/Status Indicators
  
• 4 or 10 Form-C Relay Alarms
  
• Up to 72 Load Breakers per Cabinet
  
• Up to 4 Bulk Outputs per Cabinet
  
• LCD Display with Keypad