DIGITAL 2T-48VDC-xx -48Vdc-to-120Vac Power Inverter

This Owner's Guide provides comprehensive information for the DIGITAL 2T-48VDC-xx -48Vdc-to-120Vac power inverter. Designed for Telco central office environments, this modular system converts a -48 Vdc input into a true sine wave 120 Vac 60Hz output. The inverter is available in various redundant (N+1) and nonredundant models, supporting output powers from 1 kW to 3 kW.

The document covers:

• System Overview: Describes the inverter's purpose, its modular building blocks (Inverter Power Module, Inverter Control Module, Inverter Alarm Module), and lists different models with their power ratings.
• Controls and Indicators: Details the functions of switches and LEDs on the inverter alarm, control, and power modules, as well as components on the rear panel, including -48 Vdc input terminal blocks, circuit breakers, AC output connectors, and an external alarm connector.
• Installation: Provides instructions for site preparation (including critical clearances and power down procedures), unpacking, and physical installation of the inverter chassis in a RETMA cabinet. It also outlines the normal power-up sequence and verification tests, including functionality tests and optional load tests. Procedures for installing redundant inverter control and power modules are included.
• External Alarm Circuits: Explains how to connect external alarm signals via a 25-pin D-subminiature connector, listing types of alarms (Minor, Major, Inverter Fail, DC Fail, AC Fail) and their pinouts.
• Troubleshooting: Offers basic troubleshooting steps focusing on checking module seating, power presence, and LED indications to diagnose problems.
• Removal and Replacement: Provides detailed procedures for removing and replacing the front cover, the entire chassis, and individual field-replaceable units (FRUs) such as the Inverter Alarm Module, Inverter Control Module, and Inverter Power Module, differentiating between redundant and nonredundant systems where applicable.
• Hardware Specifications: Includes physical, environmental, and electrical specifications, such as weight, dimensions, operating temperature, input/output voltages and currents, efficiency, and compliance with Electromagnetic Compatibility and Safety standards.

The guide emphasizes safety warnings, particularly regarding electrical shock, grounding, proper lifting techniques, and the requirement for qualified personnel to perform installation and maintenance.