5.2.2 Bypass Mode
The UPS automatically switches to Bypass mode if it detects an overload, load fault, or internal failure. The bypass source supplies the commercial AC power to the load directly.
Figure 5–3 shows the path of electrical power through the UPS system when operating in the Bypass mode.
CAUTION:
The critical load is not protected while the UPS is in the Bypass mode.
Static Bypass
| | | | IA1 |
| | K4 | | Static Switch |
K1 | Input Filter | Rectifier | Booster |
| F1 | | | |
Breaker | Contactors | Switches | | |
Closed | | | | |
Open | | | | Battery |
| | | |
| | | | Breaker |
| | | | Battery |
| NOTE: In this mode K2 is energized. |
Battery | Switching between bypass and inverter |
Charger | is performed by either turning on or off |
| the inverter IGBT or bypass switch. |
| |
Main Power
Trickle Current
Energized
De-Energized
Figure 5–3. Path of Current Through the UPS in Bypass Mode
In BYPASS mode, the output of the system is provided with three phase AC power directly from the systems input. While in this mode, the output of the system is not protected from voltage or frequency fluctuations or power outages from the source. Some power line filtering and spike protection is provided to the load but no active power conditioning or battery support is available to the output of the system in the bypass mode of operation.
The internal bypass is comprised of a solid state silicon controlled rectifier (SCR) static switch (SSW), and a back feed protection contactor (K4). The static switch is rated as a continuous duty device that is used anytime the boost converter and inverter is unable to support the applied load. The static switch is wired in series with the back feed protection
5-6 | Powerware 9335 (80 kVA and 120 kVA) Installation and Operation |
| 164201396 REV A 071103 |
Uninterruptible Power Supply 80 kVA 120 kVA
Page
Important Safety Instructions
Table of Contents
Operational Controls and Features
Using the Control Panel
Understanding UPS Operation
Product Specifications
Appendix a Customer Information Warranty
UPS Operating Instructions
Responding to System Events
List of Figures
Main Elements of the UPS System
List of Tables
Introduction
Basic System Configurations
Conventions Used in This Manual
Safety Considerations
Getting Help
Section Installation
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Installing the UPS
Creating an Installation Plan
Getting Started
Preparing for Wiring the UPS System
Preparing Your Site
Environmental Considerations
Powerware 9335 80 kVA and 120 kVA UPS Packaging
Inspecting and Unpacking Each Cabinet
Do not tilt cabinets more than ±10 degrees from vertical
Installing the UPS System
Preliminary Installation Information
UPS Cabinet Installation
Installing External Battery Power Wiring
Installing Customer Connections
Battery Cabinet Installation
Completing the Installation Checklist
Initial Startup
Installation Checklist
Installing and Connecting Batteries
Important Safety Instructions
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Installing a Remote EPO Control
Installation Procedures
To Install a Remote EPO
Remote EPO Wire Terminations
To Operate a Remote EPO
Section Operation
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Understanding UPS Operation
Looking Inside the UPS System
REV a
Normal, Battery and Bypass Modes
Normal Mode
Normal Mode
Page
Bypass Mode
Static Bypass
Page
Battery Mode
Battery Mode
Page
Maintenance Bypass Mode
Maintenance Bypass Mode
Batteries and Battery Charger
Functional Description
Input Rectifier
Boost Converter
Maintenance Bypass
Static Bypass
Operational Controls and Features
General
UPS Operational Controls
Control Panel
System and Load ON/OFF
UPS Standard Features
Options and Accessories
Remote Emergency Power OFF
Battery Cabinets
Communications
Safety Considerations
Symbols, Controls, and Indicators
Protective Grounding Terminal
Using the Control Panel
Description
Using the Control Panel
Power Management Display
LED Indicators
Pushbutton Functions
4 ON/OFF Startup and Shutdown Pushbuttons
Description of the LCD Screen
Status Screens
LCD Display Structure and Navigation
Load OFF
Main Menu Screen
Event Log Screen
Measurements Screen
Commands Screen
UPS Data
Set-Up User
Set-Up Service
SET-UP Service Password
On Line Mode Inverter Mode
OFF Line Mode Bypass or Economy Mode
Perating Modes
Maintenance Bypass Mode
Line INV
Parallel Isolator IA2
Start-Up Procedure for the UPS
UPS Operating Instructions
Operation
LED Indicator Color
Complete Shutdown Procedure for the UPS
Load Transfer to Maintenance Bypass
Line OFF Bypass Inverter Battery
Red
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Alarms
Menu, Commands, Event Log, and Measurements
Responding to System Events
Fault Identification and Correction
Alarm Condition Meaning Suggested Solution
Communications10
Slot Communication Modules
X-Slot Location on Front of Powerware 9335 UPS Cabinet
Single-Port Serial Card
Communication Port on the Single Port Serial Card
10-4
Options
Generator on Facility
11-2
Important Safety Instructions
Maintaining the UPS System
General
Performing Preventive Maintenance
Perform the following checks Daily
Product Specifications
System Information
UPS System Input
Environmental Specifications
UPS System Output
Appendix a Customer Information
Powerware 9335 80 kVA
Powerware 9335 120 kVA
AC Input to Phase a #6-250 kcmils Cooper 42.4 375
Table E. Maximum Input Circuit Breaker Ratings Amperes
Table F. Maximum Output Circuit Breaker Ratings Amperes
Table G. Customer Interface Inputs and Outputs
Terminal Name Description
Alarm MNS
REV a 07/11/2003
Table J. Equipment Weight
Ambient Temperature Range
Powerware 9335 80kVA and 120 kVA
Table K. System Clearances
Elements
Figure A-2. Powerware 9335 80 kVA and 120 kVA Label
1A, 1B, 1C, 1N
2A, 2B, 2C, 2N
3A, 3B, 3C, 3N
Electrical Diagram 120 kVA S06-0001ULA Powerware
NW4007
Figure A-7. UPS Cabinet Dimensions Rear View
750 mm .6 inches 700 mm .6 inches 1800 mm
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Limited Factory Warranty for THREE-PHASE Powerware Products
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