Emerson 10-30kVA 4.0 MAINTENANCE BYPASS CABINET

Maintenance Bypass Cabinet

25

4.0 MAINTENANCE BYPASS CABINET

The Maintenance Bypass Cabinet is designed to operate in UPS mode, bypass mode and maintenance

mode. The mode is selected using the Bypass Switch.

Figure 17 Single UPS with external Maintenance Bypass Cabinet—typical configuration

4.1 Bypass Switch

The Bypass Switch allows easy and rapid transfer of connected loads between the UPS and Bypass

source.

4.2 Normal (UPS) Mode

While the Maintenance Bypass Cabinet rotary switch is in the NORMAL position, the UPS is supply-

ing the connected load with continuous, high-quality AC power. In this mode of operation, the load is

protected by the UPS.

Qin UPS

Battery 1

Fuse

Charger

UPS 1

CB 1

Rectifier

Static

Switch

Inverter

SW1-C

SW1-D

SW1-A

Input Mains

Supply A B C

Input Supply

A B C

Ext Byp

A B C

Sys In CB1

Rotary

Switch

QoutUPS

Sys Out CB2

Ext Byp

CB 1

To Load

Contents

Main Page TABLE OF CONTENTS Page FIGURES TABL ES IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS !WARNING Battery Cabinet Precautions GLOSSARY OF SYMBOLS ! i 1.0 I 1.1 External Inspections 1.2 Internal Inspections 1.2.1 Storing for Delayed Installation 1.3 Preliminary Checks 1.3.1 Identification 1.4 UPS Location 1.4.1 Positioning the UPS 1.4.2 Environmental Considerations 1.5 Considerations in Moving the NX Final Position 1.6 Mechanical Considerations 1.6.1 Clearances 1.6.2 Floor Installation 1.6.3 Cable Entry 10-30kVA UPS System Composition NX NX 2.0 ELECTRICAL CONNECTIONS 2.1 Power Cabling 2.1.1 Cable Rating Lug Size and Torque Requirements 2.1.2 UPS Input Configuration 2.1.3 Cabling Guidelines 2.1.4 Cable Connections B 2.1.5 Safety Ground 2.1.6 Protective Devices UPS Rectifier and Bypass Input Supply System Output 2.1.7 Cabling Procedure Common Input Connections Dual Input Connections Output System ConnectionsEnsure Correct Phase Rotation Internal UPS Battery Connections 2.2 Control Cables 2.2.1 Monitor Board Features Figure 7 Auxiliary terminal block detail (Monitoring Board) 2.3 Dry Contacts The UPS provides input dry contacts and output dry contacts. 2.3.1 Input Dry Contacts There are several input dry contacts at the X3 slot. Figure 8 Input dry contacts Table 1 Input dry contacts at X3 2.3.2 Maintenance Bypass Cabinet Interface 2.3.3 BCB Box Interface 2.3.4 Output Dry Contacts 2.3.5 EPO InputOptional Firmware Before M200 Firmware M200 or Later 3.0 BATTERY INSTALLATION 3.1 Introduction 3.2 Safety 3.3 UPS Batteries 3.4 External Battery Cabinet Installation 3.4.1 Matching Battery Cabinets 3.4.2 Connecting the Batteries Figure 13 Narrow battery cabinet, 27 in. (690mm) - rear view Figure 14 Wide battery cabinet, 57 in. (1488mm) - front view 3.4.3 Installation Considerations Figure 15 Internal cable wiring from battery cabinet to Liebert NX Figure 16 Battery tray and supports 3.4.4 Connecting the Battery Cabinet to the UPS 3.5 Non-Standard Batteries Maintenance Bypass Cabinet 25 4.0 MAINTENANCE BYPASS CABINET 4.1 Bypass Switch 4.2 Normal (UPS) Mode 4.3 Bypass Mode 4.4 Maintenance Mode 4.5 Locating the Cabinet 4.6 Cable Installation 4.6.1 Wiring Preparation 4.6.2 Power Cable Installation 4.6.3 Input/Output Wiring Page 4.7 Bolting Cabinets Together 5.0 O 5.1 Load Bus Synchronization 5.1.1 Performance Requirements 5.1.2 DBS Cable and Settings 5.2 Configuring Parallel System Operation 5.2.1 General 5.2.2 Features of Parallel System 5.2.3 Operating Principles Redundancy Paralleling 5.2.4 Operation Modes Summary 5.3 Installing Parallel System 5.3.1 Conditions for Parallel System 5.3.2 Cabinet Installation 5.3.3 Preliminary Checks 5.3.4 Protective Devices UPS Appendix 34 Figure 24 Auxiliary dry contact cables for output breaker in multi-module system Q1Ext Q2Ext QnExt Input Distribution UPS 1 UPS 2 UPS N To Load Page 5.4 Battery Circuit Breaker Box Options 37 Figure 27 Battery circuit breaker box connections J10.3 Bottom View Midpoint Busbar Detail J10.2 6.0 UPS S 6.1 Conformity and Standards 6.3 UPS Mechanical Characteristics 6.2 UPS Environmental 6.4 UPS Electrical Characteristics Table 10 UPS terminal 6.4.1 Battery Manufacturers and Models 6.4.3 DC Intermediate Circuit 6.4.2 Input Rectifier Table 11 Approved batteries Table 12 Rectifier input power 6.4.4 Inverter Output 6.4.5 Bypass Input Table 14 Inverter output Table 15 Bypass input 7.0 INSTALLATION DRAWINGS Figure 29 Dimensions continuedtop and bottom views Figure 30 Main componentstypical unit Front View (with door open) Page Page -N+ TOP LAYER MIDDLE LAYER BOTTOM L AYE R Page Page Figure 36 NX 1+1 parallel cabinet interconnections Table 18 Liebert-supplied interconnect wiring 1+1 Parallel Cabinet (Front View Without Front Door and Panel) Page Page Page UPS Module Left Side View (without side panel) Page Page Page Page Page 8.0 SPECIFICATIONS AND TECHNICAL DATA 8.1 Lug Size and Torque Requirements Table 28 Battery torque rating Table 29 Maintenance bypass cabinet electrical data (single input) Table 30 Maintenance bypass cabinet electrical data (dual input) Table 29 Maintenance bypass cabinet electrical data (single input) (continued) Table 31 Multi-module bypass cabinet electrical data Table 30 Maintenance bypass cabinet electrical data (dual input) Page Page Page Page Page Table 32 Maintenance bypass cabinet lug sizes Table 33 Battery cabinet physical characteristics Table 32 Maintenance bypass cabinet lug sizes (continued) Table 34 Maintenance Bypass Cabinet weights 8.2 Cable Lengths: Floor to Connection Point Inside UPS Table 35 Maintenance bypass cabinet dimensions Table 36 Multi-module paralleling cabinet dimensions Table 37 Distance to connection points on the NX UPS Page Page Page Ensuring The High Availability 0f Mission-Critical Data And Applications. Technical Support / Service Locations