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ADCP-80-575
Issue 2
December 2006
PowerWorx® Power Distribution Products
Select Series™ Fuse Platform (With
Enhanced KLM Fuses) User Manual
18858-A
1388844 Rev B
ADCP-80-575 • Issue 2 • December 2006 • Preface
COPYRIGHT
© 2006, ADC Telecommunications, Inc.
All Rights Reserved
Printed in the U.S.A.
REVISION HISTORY
ISSUE |
DATE |
REASON FOR CHANGE |
1 |
11/2006 |
Original. |
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2 |
12/2006 |
Figure 3 block diagram changed to show dual bus; minor changes in section 1.8 and table 1. |
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TRADEMARK INFORMATION
PowerWorx is a registered trademark of ADC Telecommunications, Inc.
ADC is a trademark of ADC Telecommunications, Inc.
DISCLAIMER OF LIABILITY
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice. In no event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits and ADC further disclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of liability applies to all products, publications and services during and after the warranty period.
This publication may be verified at any time by contacting ADC’s Technical Assistance Center at 1-800-366-3891, extension 73475 (in U.S.A. or Canada) or 952-917-3475 (outside U.S.A. and Canada), or by e-mail to connectivity_tac@adc.com.
ADC Telecommunications, Inc.
P.O. Box 1101, Minneapolis, Minnesota 55440-1101
In U.S.A. and Canada: 1-800-366-3891
Outside U.S.A. and Canada: (952) 938-8080
Fax: (952) 917-1717
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ADCP-80-575 • Issue 2 • December 2006 • Preface
TABLE OF CONTENTS
Content |
Page |
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Standards Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Admonishments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
General Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
1 PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Product Functions and Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Fuse Platform Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Product Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Packaged Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Power Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.8 Bus Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.9 Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.10 Input Power Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.11 Output Power Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.12 Ground Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.13 Alarm Contact Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.14 Alarm Contact Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.15 Fuse Alarm Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.16 Power-On Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.17 Fused Equipment Designation Card and Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.18 Voltage Designation Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.19 Environmental Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.20 Material and Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.21 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.22 Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.23 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.24 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2 UNPACKING AND INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3 PRE-INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1 General Installation Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 Installation Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 Materials Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4 Continuity Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1 Installing Cable Management Bar (Optional Item) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.2 Mounting Fuse Platform on Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3 Grounding Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4 Connecting Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.5 Connecting Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006 • Preface
TABLE OF CONTENTS
Content |
Page |
4.6 Connecting Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.7 Installing Protective Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.8 Installing GMT Fuse Designation Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.9 Installing Fuse Designation Card Holder and Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.10 Installing Voltage Designation Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5 SYSTEM CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.1 Wiring Connections Torque Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.2 Power On and Connection Polarity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.3 GMT Fuse Alarm Test and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.4 TPA Fuse Alarm Test and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.5 KLM Fuse Alarm Test and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.1 Clearing a KLM Fuse Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.3 Fuse Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8 CUSTOMER INFORMATION AND ASSISTANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 A APPENDIX A: ALLOWABLE AMPACITIES OF INSULATED CONDUCTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006 • Preface
ABOUT THIS MANUAL
This manual describes the PowerWorx® Select Series™ Fuse Platform and provides installation, operation, maintenance, and testing procedures. The Select Series™ Fuse Platform is available with various types of fuses including TPA, KLM, and GMT fuses. Two types of fuses can be combined within the same platform, if required. Within this manual, the Select Series™ Fuse Platform is referred to as the “Select Series™ fuse platform” or the “fuse platform”.
STANDARDS CERTIFICATION
The fuse platform complies with the applicable sections of the following standards: UL, Telcordia, NEC 1999, CE, IEC, CSA, and NEBS Level 3.
ADMONISHMENTS
Important safety admonishments are used throughout this manual to warn of possible hazards to persons or equipment. An admonishment identifies a possible hazard and then explains what may happen if the hazard is not avoided. The admonishments — in the form of Dangers, Warnings, and Cautions — must be followed at all times. These warnings are flagged by use of the triangular alert icon (seen below), and are listed in descending order of severity of injury or damage and likelihood of occurrence.
Danger: Danger is used to indicate the presence of a hazard that will cause severe personal injury, death, or substantial property damage if the hazard is not avoided.
Warning: Warning is used to indicate the presence of a hazard that can cause severe personal injury, death, or substantial property damage if the hazard is not avoided.
Caution: Caution is used to indicate the presence of a hazard that will or can cause minor personal injury or property damage if the hazard is not avoided.
GENERAL SAFETY PRECAUTIONS
-
Warning: The fuse platform uses electrical voltage and current levels that may be considered an electrical hazard. Care should be exercised to assure that only qualified personnel are allowed to install, operate, maintain, or otherwise come into contact with this equipment when the fuse platform is energized. Only insulated tools should be used on energized elements of the fuse platform.
Caution: All fuse platform wiring and cabling should be connected with the system office battery input off or disconnected at the office distribution panel.
Caution: A replacement fuse must be of the same type and current rating as the fuse being replaced.
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006 • Preface
Warning: Wet conditions increase the potential for receiving an electrical shock when installing or using electrically-powered equipment. To prevent electrical shock, never install or use electrical equipment in a wet location or during a lightning storm.
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006
1 PRODUCT DESCRIPTION
This section describes the PowerWorx Select Series Fuse Platform.
1.1Product Functions and Features
The Select Series Fuse Platform, shown on the front cover of this manual, supplies protected dc power to the –24 Vdc or –48 Vdc equipment typically installed in a central office, multimedia headend, remote site, Controlled Environmental Vault (CEV), or other restricted locations. The fuse platform is available in a single or dual bus configuration and in several configurations of fuse types. The fuse platform provides the following important features:
•19-inch or 23-inch EIA or WECO rack mounting.
•Self-configuring input voltage capability to –24 Vdc or –48 Vdc.
•GMT, KLM, or TPA fuse types alone (with corresponding fuse holder modules), or GMT in combination with either of the other two types.
Note: KTK fuses will also fit in the KLM fuse holder, but are not currently rated for dc voltages by Underwriters Laboratories (UL).
•“Upside down” GMT fuse holders making blown fuses easier to see.
•Optimally-positioned, high-brilliance fuse alarm (red LED) indicators, providing quick identification of blown fuses.
Note: For KLM fuses, there is a two-color (green/red) LED for each fuse position. A green LED indicates a good fuse. A red LED indicates a failed fuse or a removed fuse. A method is available to disable the LED (no green or red light) when a fuse holder is left empty on purpose (see Section 6.1 on Page 28).
•Field-replaceable high-brilliance power-on (green LED) indicators (one per bus).
•Easy-to-remove plastic protective covers for input and output terminals.
•Two-hole compression-lug terminals for input power connections.
•Two grounding studs for robust and reliable ground connectivity.
•Screw-down barrier terminal strips for power output connections.
•Relay contacts for alarms (corresponding to red LEDs above). The alarm contacts may be used to open or close a loop connected from an external alarm system.
1.2Fuse Platform Components
The Select Series Fuse Platform, shown in Figure 1, is a customer-configurable product containing either one or two power buses. Each power bus is connected to multiple fuse holder modules. In a dual bus platform, the two buses are mirror images of one another, having the same types of fuses and the same size fuse holder modules.
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006
UL/CSA/CE
LABEL
BUS A POWER ON
INDICATOR
(GREEN LED) BUS B POWER ON INDICATOR
(GREEN LED)
BUS A 
BUS A KLM/KTK KLM/KTK FUSE HOLDERS FUSE ALARM
INDICATOR (TYPICAL)
BUS A GMT FUSE ALARM INDICATOR
BUS B GMT FUSE ALARM INDICATOR
BUS A GMT |
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FUSE HOLDER |
BUS B GMT |
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(4 POSITION) |
BUS B KLM/KTK |
||
FUSE HOLDER |
|||
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FUSE HOLDER |
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(4 POSITION) |
||
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FRONT VIEW
CHASSIS
GROUND
STUDS
BUS B |
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|
POWER INPUT |
BUS B |
|
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TERMINALS |
|
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||
GMT FUSED |
|
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||
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||
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POWER OUTPUT |
|
|
|
BUS B |
TERMINALS |
BUS A |
|
|
KLM/KTK FUSED |
|
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||
|
GMT FUSED |
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||
POWER OUTPUT |
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||
ALARM |
POWER OUTPUT |
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||
TERMINALS |
|
|||
TERMINALS |
TERMINALS |
BUS A |
||
|
POWER INPUT
TERMINALS
BUS A
KLM/KTK FUSED
POWER OUTPUT
TERMINALS
REAR VIEW |
PROTECTIVE |
|
|
|
COVER |
BUS B
KLM/KTK
FUSE ALARM INDICATOR (TYPICAL)
DESIGNATION CARD
AND CARD HOLDER
MOUNTING
BRACKETS (2),
INSTALLED FOR 19-IN.
(48.26 CM) RACK
MOUNTING
COVERS FOR
INPUT POWER
TERMINALS
18877-B
Figure 1. Dual Bus KLM-GMT Fuse Platform
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006
Warning: Use of one bus only on a dual bus panel will result in false alarms for the unused bus. Power is required on both buses on a dual bus panel for normal operation.
Depending on customer order, the fuse platform may have one fuse type alone, or GMT fuses in combination with one other fuse type (KLM or TPA). The number of fuse positions on each bus is dependent on the maximum current limit, as well as on the current value of the fuses and the width of the fuse holders. The maximum current input per bus is 100 Amps.
Note: The continuous output load of the equipment during normal operation should not exceed 80% of the rated value of the fuse. This allows some room for manufacturing tolerances and voltage fluctuations in the plant power mains.
Figure 1 shows the external features of a typical fuse platform (in this case, a dual bus fuse platform with four KLM and four GMT fuses per bus).
1.3Product Options
The following configurations of fuses are available:
•Four TPA fuses with four or ten GMT fuses
•Two or four KLM or KTK fuses with four or ten GMT fuses
•Any of the above fuse types alone including:
–Four TPA fuses per bus
–Two or four KLM or KTK fuses per bus
–Ten GMT fuses per bus
Fuse capacity varies per fuse type (see Section 1.8, Bus Capacity on page 8). The total fuse output cannot exceed 100 Amps per bus (200 Amps per dual bus platform).
Note: The continuous output load of the equipment during normal operation should not exceed 80% of the rated value of the fuse. This allows some room for manufacturing tolerances and voltage fluctuations in the plant power mains.
All fuse platforms have power-on LEDs that light in green indicating the presence of power and fuse alarm LEDs that light in red indicating a blown fuse. In addition, the fuse alarm LEDs on the enhanced KLM fuse platform have a green state indicating that a fuse is installed and receiving power.
Two types of alarm contacts are available: wire wrap or screw-down barrier terminal strip.
Two fuse platform mounting options are available: EIA/WECO or ETSI. (All fuse platforms can be installed in either a 19-inch or 23-inch rack. The fuse platform comes with mounting brackets for both rack widths.)
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006
1.4Packaged Hardware
The fuse platform is shipped with hardware components (shown in Figure 2) that are packaged separately and enclosed in the same carton. The packaged hardware components include the following items:
•Two sets of mounting brackets (for 19-inch or 23-inch rack mounting)—Used to mount the panel on the equipment rack.
•5/16-inch long, Phillips drive, 8-32 flat-head thread-forming screws (8)—Used to secure the mounting brackets to the panel.
•3/8-inch long, combination drive, 12-24 pan-head screws (4) and #12 flat washers (4)— Used to secure the mounting brackets to the equipment rack.
•#10 ring terminals (2) for 12–10 AWG wire—Used to connect the grounding cables to the grounding studs.
•Rear protective input terminal covers and output terminal covers—Used to prevent accidental contact with the power input and output terminals. The number of covers provided depends on the fuse configuration.
•Designation card and card holder—Used to record information about the protected equipment. The card holder has a pressure-sensitive adhesive backing to permit attachment to the panel, the rack, or a location close to the panel. The designation card inserts into the card holder. It is also available as an accessory item.
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006
REAR COVER FOR OUTPUT POWER TERMINAL BLOCKS,
ALARM TERMINALS, AND CHASSIS GROUND TERMINALS
REAR COVERS FOR INPUT |
#10 RING TERMINALS FOR |
POWER TERMINAL BLOCKS |
12-10 AWG WIRE (GROUNDING) |
|
5/16-INCH (7.936 MM) 8-32 |
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FLAT-HEAD SCREWS |
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19-INCH |
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RACK MOUNTING |
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BRACKETS |
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3/8-INCH (9.525 MM) 12-24 |
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SCREWS AND #12 WASHERS |
DESIGNATION CARD, |
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PROTECTIVE COVER, |
|
AND CARD HOLDER |
23-INCH |
|
|
|
RACK MOUNTING |
|
BRACKETS |
MOUNTING BRACKETS
AND SCREWS FOR 19-INCH OR 23-INCH RACK INSTALLATION
18876-A
Figure 2. Packaged Hardware Components
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© 2006, ADC Telecommunications, Inc.
ADCP-80-575 • Issue 2 • December 2006
1.5Accessories
The following accessories are available for the fuse platform:
•Standard size GMT, KLM, and TPA type fuses
•GMT colored fuse-value designation pins (rivets)
•Cable management bar kits
•GMT fuse pullers
•Two-hole compression connector lugs for input power connections
•Lug terminals to connect #10 AWG wire to earth ground
•GMT fuse value designation pin holders
•Fuse value designation card holder kits
1.6Mounting
The fuse platform can be mounted in a 19-inch (48.26 cm) or a 23-inch (58.42 cm) equipment rack. Two pairs of mounting brackets, one pair for 19-inch racks and one pair for 23-inch racks, are provided with the fuse platform. The fuse platform can be flush mounted or recessed 1, 2, 3, or 4 inches (2.54, 5.08, 7.62 or 10.16 cm) from the front of the rack. The mounting brackets allow mounting in racks with WECO 1.00-inch (2.54 cm) hole spacing or EIA 1.25-inch (3.18 cm) hole spacing. The slotted hole pattern in the mounting brackets compensates for vertical rack differences and allows the fuse platform to be mounted in either 1.75or 2-inch (4.45 or
5.08cm) rack spaces.
1.7Power Buses
The fuse platform is available with one or two separate power buses. Each bus distributes the input power to multiple fused output circuits. In each bus circuit, current flows from the input connector to the fuse bus. When a fuse is installed in a fuse holder, the circuit is completed to the corresponding output connector. Figure 3 provides a block diagram of the power buses in a typical fuse platform (dual bus model shown).
Fuse failure is sensed by a sensor which causes the alarm monitor to light a red LED indicator on the front of the fuse holder. The function of the fuse failure indicator differs depending on fuse type as follows:
•For GMT fuses, there is a red LED indicator for each set of fuses (depending on product configuration, each fuse holder holds four or ten fuses). Fuse failure also opens and closes a set of alarm contacts (form C dry contacts) connected to the alarm output terminals. There is one such set of alarm contacts for each bus, with failure of any fuse on the bus causing an alarm condition.
•For TPA fuses, there is an individual red LED indicator for each individual fuse because each fuse holder holds a single fuse.
•For KLM fuses, there is an individual two-color indicator (green/red LED) for each fuse. The indicator functions as follows:
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© 2006, ADC Telecommunications, Inc.
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