Alpha 255A Bypass Switch Owner's manual
- Type
- Owner's manual
Your Power Solutions Partner
Alpha 255A External Maintenance Bypass Switch
for Uninterruptible Power Supply Systems
Installation & Operation Manual
Part # 0200018-J0
Effective: 01/2012
member of The Group
™
Alpha 255A External Maintenance Bypass Switch
for Uninterruptible Power Supply Systems
For technical support, contact Alpha Technologies:
Canada and USA: 1-888-462-7487
International: +1-604-436-5547
Email: [email protected]
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, opti-
cal, 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.
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 oper-
ated in an unapproved manner, or improperly maintained.
Photographs contained in this manual are for illustrative purposes only. These photo-
graphs 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:
NOTE:
0200018-J0 Rev C
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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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0200018-J0 Rev C
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 fol-
lowing 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.
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.
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.
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.
0200018-J0 Rev C
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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.
1.2 General Warning and Cautions
• 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 dou-
ble-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 assis-
tance.
1.3 Certifications and Compliances
The Alpha MBS has been designed, manufactured, and tested to the requirements of the following na-
tional and international safety standards:
; UL 508
5
0200018-J0 Rev C
2. Introduction
2.1 What this Manual Covers
This manual provides full procedures for the safe and proper installation and operation of the Alpha Ex-
ternal 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 associ-
ated 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-Installa-
tion" 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)
0200018-J0 Rev C
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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 sup-
plies (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
3. Features
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°.
15°
345°
In Phase Bypass Enabled
Manual switch
Bar for lockout
with a padlock
Phase meter
IN PHASE lamp
Electro-mechanical
key-operated switch
7
0200018-J0 Rev C
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Figure 1 — Auxiliary contacts
3.2 Auxiliary Contacts for Remote Monitoring
The operation of the Alpha MBS is "make-before-break". The auxiliary contacts are available to generate
an alarm if a "caught in transition" condition occurs.
The auxiliary switch contacts are located below TB3 in the interior of the Alpha MBS – see Figure 1.
Table A shows the condition of these contacts for all possible states of the bypass switch.
The System Schematic is shown in Chapter 6 on page 14.
Table A — Auxiliary switch truth table
MBS Function
BYPASS A1-A2 (BYP) Closed
UPS A3-A4 (UPS) Closed
CAUGHT IN
TRANSITION
A5-A6 Closed between positions
A7-A8 Closed between positions
Table B — Auxiliary Contacts – Electrical Ratings
Voltage Rating
250 Vac (max)
Current Rating
15 A
0200018-J0 Rev C
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3.3 Lockout with a Padlock
When someone is working on the UPS, they may want to padlock the handle in the BYPASS position to
prevent anyone changing the handle position while the work is in progress.
A padlock can be attached to the red bar at the bottom of the manual switch. Push the red bar in, and
route a padlock (or lockout bar) through the openings on the face, down toward the bottom of the legend
(Figure 2).
Figure 2 — Lockout with a padlock
9
0200018-J0 Rev C
4. Pre-Installation
4.1 Unpacking
Before unpacking the product, note any damage to the shipping container. Unpack the product and
inspect the exterior for damage. If any damage is observed, contact the carrier immediately.
Continue the inspection for any internal damage. In the unlikely event of internal damage, inform the car-
rier and contact Alpha Technologies for advice on the impact of any damage:
1 888 462-7487
4.1.1 Returns for Service
Save the original shipping container. If the product needs to be returned for service, it should be pack-
aged in its original shipping container. If the original container is unavailable, make sure that the product
is packed with at least three inches of shock-absorbing material to prevent shipping damage.
Alpha Technologies is not responsible for damage caused by improper packaging of returned products.
WARNING!
Branch Circuit Protection: The utility line connected to the input of the Alpha MBS
MUST be protected by an over-current, current limiting device that limits the short cir-
cuit current to under 5kA. The device must be certied for this use in accordance with
the local electrical code.
NOTE:
Note on Grounding: The Alpha MBS is suitable both for installation as part of the Com-
mon Bonding Network and the Isolated Bonding Network.
NOTE:
The Alpha MBS is suitable for installations in Network Telecommunication Facilities and
locations where the National Electrical Code applies.
0200018-J0 Rev C
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Alpha MBS Front View
19.1mm
36.00in 914.4mm
0.75in 19.1mm
609.6mm24.00in
12.00in 304.8mm
DISTANCE TO WALL
OR EQUIPMENT
0.50in 12.7mm X4
MOUNTING HOLES
0.75in
19.1mm
0.75in
19.1mm
0.75in
Figure 3 — Alpha MBS mounting diagram
4.2 Site Planning
4.2.1 Mounting
Consult local electrical codes to determine a suitable location for mounting the Alpha MBS.
Use the dimensions in Figure 3 to wall mount the Alpha MBS with adequate clearance from the adjoining
wall.
4.2.2 Wiring
The terminal blocks in the Alpha MBS are suitable for a single #6 AWG and up to 350 kcmil wire (mini-
mum 75 ºC rated).
11
0200018-J0 Rev C
5. Installation
WARNING!
Make sure that you have read and understood all the information given in "Product
Safety Information" on page 3.
Always operate the switch with a quick continuous motion, do not hold it in mid-posi-
tion.
CAUTION!
DO NOT operate the bypass switch while the UPS is in inverter mode (front display on
the UPS shows INVERTER).
CAUTION!
Operating with the inputs out of phase could cause damage to the critical loads.
CAUTION!
5.1 Installing the Manual Bypass Handle
The unit ships with the handle sitting in the NORMAL position but
not installed (Figure 4.)
Install the handle as shown in Figure 6. The collet, the segmented
sleeve that fits around the shaft, is keyed to the shaft (Figure 5.
Take care not to rotate the handle in relation to the collet. The collet
slides on the shaft with little resistance when aligned correctly.
A raised line on the
plastic is the key
indicator on the
collet.
Shaft key is
corner notched
Figure 4 — Shipping position
Figure 5 — Shaft and collet keying
Figure 6 — Handle install sequence
0200018-J0 Rev C
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The terminal blocks in the Alpha MBS are suitable for a single #6 AWG wire and up to
350 kcmil wire.
CAUTION!
WARNING!
Ensure the wire size, circuit breakers, and fuses are sized according to the applicable
electrical code and LIMIT THE SHORT CIRCUIT CURRENT TO 5000A.
WARNING!
Use minimum 75 ºC rated wire.
5.2 Wiring the Alpha MBS
Utility
TB1
TB2
TB3
Critical
Loads
Alpha MBS
Utility
UPS
TB1
TB2
TB3
Critical
Loads
Alpha MBS
System
UPS
System
Over Current
current limiting
device
Over Current
current limiting
device
Disconnect
switch with
pass- through
Figure 7 — Typical MBS wiring diagrams
Torque the terminal blocks to 31 N-m (275 in-lbs).
13
0200018-J0 Rev C
Procedure
Figure 7 shows two typical configurations for wiring the Alpha MBS into an UPS system.
1. Use a #6 AWG wire and up to 350 kcmil wire (minimum 75 ºC rating) to connect the Alpha MBS and
UPS to the utility line. Refer to typical wiring diagrams in Figure 7.
2. Torque the terminal blocks to 31 N-m (275 in-lbs).
NOTE:
Phase detection is measured between TB2-L1 and TB3-L1. See the "System Schematic"
on page 14.
For a single-phase installation, ALWAYS USE L1 on all terminal blocks (TB1, TB2, TB3).
For a 2-pole installation, use L1 for one line on all terminal blocks.
0200018-J0 Rev C
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6. System Schematic
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0200018-J0 Rev C
7. Operations
1. To allow manual transfer, turn the lockout-key to IN PHASE BYPASS ENABLE
The NORMAL/ BYPASS switch position cannot be changed if power is not present from
either power source. The Alpha MBS operates normally if at least one power source is
present. See Table A.
CAUTION!
The MANUAL OVERRIDE key can be used to change the source selection of the Alpha
MBS even when the inputs are out-of-phase condition. Operating with the inputs out of
phase could cause damage to the critical loads.
CAUTION!
2. When the green IN PHASE lamp is illuminated, turn the
switch on the side panel (Figure 8) to BYPASS.
3. Turn the lockout-key to LOCKED to prevent inadvertent
transfer.
Electro-mechanical
key-operated switch
IN PHASE lamp
Figure 9 — Side panel NORMAL/BYPASS switch
Figure 8 — In phase bypass enable
Refer to section 3.3 to lockout the manual switch with a padlock.
NOTE:
0200018-J0 Rev C
16
The NORMAL/ BYPASS switch position cannot be changed if power is not present from either power
source. Use the following procedure to release the bypass switch solenoid if a situation arises where all
power is lost and it is necessary to change the position of the switch.
1. Release the solenoid by inserting a non-conductive device (plastic pen, e.g ), into the hole in the
bottom of the switch mount.
2. Listen for the audible click of the solenoid as it releases.
3. Reposition the switch.
Pen or
other non-
conducting
device
Hole in the
bottom of the
switch mount
Figure 10 — Manual release of bypass switch solenoid
WARNING!
Do NOT perform this procedure if power is present at the switch.
8. Troubleshooting
8.1 Manual Release of Bypass Switch Solenoid
17
0200018-J0 Rev C
9. Specifications
Alpha MBS Specifications and Approvals
Model Number 0200018
Alpha MBS – Mechanical Sp ecifications
Dimensions, cm (in)
H x W x D
91 x 61 x 28 (36 x 24 x 11)
Weight, kg (lb) 79.5 (175)
Color Grey
Humidity Operating (non-condensing): Up to 95%
Storage: Up to 95%
Cooling Not applicable (no heat generating
components inside)
Sound Power Level Not applicable
Temperature Range °C (°F) Operating: -20 (-4) to 40 (104)
Storage: -40 (-40) to 75 (167)
Altitude m (ft) Operating: Up to 3658 (12,000)
Storage: Up to 4572 (15,000)
Alpha MBS – Electrical Specifications
Voltage Rating 120/ 208 and 120/240 Vac (nominal)
Current Rating 255 A
Short Circuit Current
Rating
5kA
Current vs Temp
Current (A) Ambient Temperature
255 40°C
210 45°C
170 50°C
Alpha MBS – Auxiliary Contacts Ratings
Voltage Rating
120 Vac (max)
Current Rating 20 A
Alpha MBS – Approvals
Electrical Safety
This product is provided with the following
Product Certification marking:
UL / cUL 508 Listing Mark
0200018-J0 Rev C
18
10. Warranty
Alpha Technologies Ltd. warrants all equipment manufactured by it to be free from defects in parts and
labor, for a period of two years from the date of shipment from the factory. The warranty provides for
repairing, replacing or issuing credit (at Alpha’s discretion) for any equipment manufactured by it and
returned by the customer to the factory or other authorized location during the warranty period. There are
limitations to this warranty coverage. The warranty does not provide to the customer or other parties any
remedies other than the above. It does not provide coverage for any loss of profits, loss of use, costs for
removal or installation of defective equipment, damages or consequential damages based upon equip-
ment failure during or after the warranty period. No other obligations are expressed or implied. Warranty
also does not cover damage or equipment failure due to cause(s) external to the unit including, but not
limited to, environmental conditions, water damage, power surges or any other external influence.
The customer is responsible for all shipping and handling charges. Where products are covered under
warranty Alpha will pay the cost of shipping the repaired or replacement unit back to the customer.
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Alpha 255A Bypass Switch Owner's manual
- Type
- Owner's manual
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