Alpha 255A User Manual
Alpha 255A External Maintenance Bypass Switch
for Uninterruptible Power Supply Systems
Installation & Operation Manual
Part # 0200018-J0
Effective: 01/2012
member of The Group
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Your Power Solutions Partner
Alpha 255A External Maintenance Bypass Switch
for Uninterruptible Power Supply Systems
NOTE:
Photographs contained in this manual are for illustrative purposes only. These photographs may not match your installation.
NOTE:
Operator is cautioned to review the drawings and illustrations contained in this manual
before proceeding. If there are questions regarding the safe operation of this powering
system, contact Alpha Technologies or your nearest Alpha representative.
NOTE:
Alpha shall not be held liable for any damage or injury involving its enclosures, power
supplies, generators, batteries, or other hardware if used or operated in any manner or
subject to any condition inconsistent with its intended purpose, or if installed or operated in an unapproved manner, or improperly maintained.
For technical support, contact Alpha Technologies:
Copyright
Copyright © 2012 Alpha Technologies Ltd. All rights reserved. Alpha is a registered trademark of Alpha
Technologies.
No part of this documentation shall be reproduced, stored in a retrieval system, translated, transcribed, or
transmitted in any form or by any means manual, electric, electronic, electromechanical, chemical, optical, or otherwise without prior explicit written permission from Alpha Technologies.
This document, the software it describes, and the information and know-how they contain constitute the
proprietary, confidential and valuable trade secret information of Alpha Technologies, and may not be
used for any unauthorized purpose, or disclosed to others without the prior written permission of Alpha
Technologies.
The material contained in this document is for information only and is subject to change without notice.
While reasonable efforts have been made in the preparation of this document to assure its accuracy,
Alpha Technologies assumes no liability resulting from errors or omissions in this document, or from the
use of the information contained herein. Alpha Technologies reserves the right to make changes in the
product design without reservation and without notification to its users.
Canada and USA: 1-888-462-7487
International: +1-604-436-5547
Email: support@alpha.ca
Table of Contents
1. Product Safety Information ...................................................................................................3
1.1 Safety Symbols .......................................................................................................................... 3
1.2 General Warning and Cautions .................................................................................................. 4
1.3 Certications and Compliances ................................................................................................. 4
2. Introduction ...........................................................................................................................5
2.1 What this Manual Covers ........................................................................................................... 5
2.2 Who Should Read this Manual .................................................................................................. 5
2.3 How to Use this Manual ............................................................................................................. 5
2.4 Symbols Used on the Product ................................................................................................... 5
2.5 Related Documents ................................................................................................................... 5
3. Features ................................................................................................................................6
3.1 Phase Detector with Lock-out .................................................................................................... 6
3.2 Auxiliary Contacts for Remote Monitoring .................................................................................. 7
3.3 Lockout with a Padlock .............................................................................................................. 8
4. Pre-Installation ......................................................................................................................9
4.1 Unpacking .................................................................................................................................. 9
4.2 Site Planning ............................................................................................................................ 10
5. Installation ........................................................................................................................... 11
5.1 Installing the Manual Bypass Handle ........................................................................................11
5.2 Wiring the Alpha MBS .............................................................................................................. 12
6. System Schematic ..............................................................................................................14
7. Operations ..........................................................................................................................15
8. Troubleshooting ..................................................................................................................16
8.1 Manual Release of Bypass Switch Solenoid ............................................................................ 16
9. Specications ......................................................................................................................17
10. Warranty ...........................................................................................................................18
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1. Product Safety Information
SAVE THESE INSTRUCTIONS: This manual contains important safety instruc-
tions that must be followed during the installation, servicing, and maintenance of the product. Keep it in a
safe place. Review the drawings and illustrations contained in this manual before proceeding. If there are
any questions regarding the safe installation or operation of this product, contact Alpha Technologies or
the nearest Alpha representative.
1.1 Safety Symbols
To reduce the risk of injury or death, and to ensure the continued safe operation of this product, the following symbols have been placed throughout this manual. Where these symbols appear, use extra care
and attention.
The use of ATTENTION indicates specic regulatory/code requirements that may affect the
placement of equipment and /or installation procedures.
NOTE:
A NOTE provides additional information to help complete a specic task or procedure.
Notes are designated with a check mark, the word NOTE, and a rule beneath which the
information appears.
CAUTION!
CAUTION indicates safety information intended to PREVENT DAMAGE to material or
equipment. Cautions are designated with a yellow warning triangle, the word CAUTION,
and a rule beneath which the information appears.
WARNING!
WARNING presents safety information to PREVENT INJURY OR DEATH to personnel.
Warnings are indicated by a shock hazard icon, the word WARNING, and a rule beneath
which the information appears.
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1.2 General Warning and Cautions
WARNING!
You must read and understand the following warnings before installing the Alpha MBS
and its components. Failure to do so could result in personal injury or death.
• Read and follow all instructions included in this manual.
• Do not work alone under hazardous conditions.
• Only qualified personnel are allowed to install, operate and service this system and its components.
• Before proceeding, read this manual and be sure you understand its intent.
• Always assume electrical connections or conductors are live. Turn off all circuit breakers and double-check with a voltmeter before performing installation or maintenance.
• Keep tools away from walk areas where you or others could fall over them.
• Wear safety glasses when working under any conditions that might be hazardous to your eyes.
• Do not work on the system, or connect, or disconnect cables during periods of lightning activity.
• If you have an installation configuration that is not described in this manual contact Alpha for assistance.
1.3 Certifications and Compliances
The Alpha MBS has been designed, manufactured, and tested to the requirements of the following national and international safety standards:
; UL 508
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2. Introduction
2.1 What this Manual Covers
This manual provides full procedures for the safe and proper installation and operation of the Alpha External Maintenance Bypass Switch (Alpha MBS) with meter controlled solenoid lockout.
2.2 Who Should Read this Manual
This manual is intended for qualified installers – trained electricians or technicians who are fully educated
on the hazards of installing electrical equipment such as uninterruptible power supplies and their associated batteries and accessories. The Product Safety Information chapter is intended for anyone who will
be operating the Alpha MBS as a non-technical user.
2.3 How to Use this Manual
Before you begin installing the Alpha MBS, read all the warnings and cautions described in Chapter 1.
Once you are aware of all safety issues, start planning the installation by reading Chapter "4. Pre-Installation" and Chapter "7. Operations".
2.4 Symbols Used on the Product
Risk of electric shock
2.5 Related Documents
• Local electrical codes (e.g. National Electrical Code, or NFPA 70 in the United States, Canadian
Electrical Code or CSA C22.1 in Canada)
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3. Features
The Alpha MBS is a manually operated mechanical switch for use with the Alpha series of Uninterruptible
Power Supplies (UPS). It provides a simple and effective means for bypassing uninterruptible power supplies (UPS) while maintaining continuity of power to critical loads. (A schematic at the end of the manual
shows the MBS with the Alpha AMPS80 HP power system.)
Normally the output to the critical load is powered by the UPS with the bypass switch in the NORMAL
(UPS) position. Before the UPS is taken off-line for service or maintenance, the bypass switch can be
switched to the BYPASS position and the critical loads then receive power directly from the utility supply.
The Alpha MBS includes the following safety features:
• Phase detector with lock out
• Safe-to-switch (IN PHASE) lamp
• Electromechanical manual override
• Auxiliary contacts for remote monitoring
• Padlock bar for lockout
Manual switch
IN PHASE lamp
Phase meter
3.1 Phase Detector with Lock-out
Bypass mode is enabled when UTILITY IN is within plus or minus 15 degrees of UPS OUT. The phase
difference is displayed in the phase meter at the bottom of the front panel in the range 0-360°.
Bar for lockout
with a padlock
Electro-mechanical
key-operated switch
15°
In Phase Bypass Enabled
345°
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