VAX 6000: Installing the H7236-A Battery Backup Option

This document, titled "VAX 6000: Installing the H7236-A Battery Backup Option" (Order Number EK-60BBA-IN-001), is a technical manual from Digital Equipment Corporation. It is intended for Digital customer service engineers and self-maintenance customers who need to install the H7236-A battery backup option in a VAX 6000 series system.

The manual is structured into three main chapters:

1. Introduction: Provides an overview of the H7236-A battery backup unit (BBU), including its detailed specifications (physical dimensions, weight, environmental conditions, electrical characteristics, and cooling system). It notes the BBU's ability to provide ride-through power for short losses (up to 1 second) and sustained backup power for longer outages (up to 10 minutes) to allow for an orderly system shutdown. This chapter also lists all the components included in the H7236-A battery backup kit.
2. Battery Backup Unit Installation: Offers comprehensive, step-by-step instructions for installing the BBU. Key steps involve:
   • Checking and potentially replacing the H405 AC power controller with a compatible H405-E/F unit.
   • Installing the guide rail plate assembly and chassis retainer brackets within the system cabinet.
   • Physically installing the H7236-A BBU, emphasizing that the unit is heavy (100 lbs) and may require removal of its internal battery pack for easier handling.
   • Connecting necessary cables and securing the installed unit.
3. Battery Backup Unit Indicators and Switches: Describes the BBU's operational aspects. It details the five LED indicators (for power, charge status, and fault conditions like over-temperature or battery service) and the six switches (including external voltage selection and AC power switches, and internal switches for fan interlock, alarm reset, battery life enhancement, and new battery reset).

The document includes important safety warnings, especially concerning high voltages and the weight of the unit during installation.