ADCP-80-524 • Issue 1 • November 2001
PowerWorx® Type 70 Series
Power Distribution Panel
User Manual
17068-A
Content Page
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Trademark Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Admonishments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Important Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Standard Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1 GENERAL CHARACTERISTICS AND FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.1 Power Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1.2 Redundant Power (Uninterrupted Power Fuse Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1.3 Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1.4 Input Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.5 Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
1.6 Output Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
1.7 Chassis Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.8 Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
1.9 Power-On Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1088905 Rev A Page 1
© 2001, ADC Telecommunications, Inc.
ADCP-80-524 • Issue 1 • November 2001
1.10 Fuse Alarm Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.11 Alarm Contact Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.12 Alarm Contact Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.13 Fuse Designation Strips and Perforated Cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.14 Fused Equipment Designation Card and Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.15 Voltage Designation Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.16 Material and Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.17 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.18 Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.19 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.20 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.21 Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.22 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.23 Environmental Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3 UNPACKING AND INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 Recommended Installation Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Use of Screws in Installation Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.4 Cable Management Bar (Accessory for Fuse Panels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.5 Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.6 General Wiring Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.7 Chassis Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.8 Output Power Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.9 External Alarm Contact Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.10 Input Power Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.11 Designation Strips and Perforated Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.12 Fuse Designation Card Holder and Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.13 Voltage Designation Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5 TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1 Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Resistance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.3 Wiring Connections Torque Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 Power Indication Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5 Connection Polarity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6 Fuse Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.3 Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4 LED Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8 CUSTOMER INFORMATION AND ASSISTANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
_________________________________________________________________________________________________________
Page 2
© 2001, ADC Telecommunications, Inc.
INTRODUCTION
ADCP-80-524 • Issue 1 • November 2001
This manual describes the PowerWorx®
installation, test, operation, and maintenance procedures. Two types of PowerWorx Type 70
power distribution fuse panels are available: the traditional power distribution fuse panel and
the uninterrupted power distribution fuse panel. Within this manual, the fuse panels are
referred to as the “traditional fuse panel” and “uninterrupted fuse panel.”
Revision History
ISSUE DATE REASON FOR CHANGE
Issue 1 11/2001 Original
Trademark Information
ADC and PowerWorx are registered trademarks of ADC Telecommunications, Inc.
Standards
Type 70 series fuse panels are compliant with all major standards including UL, NEC 1999, and
CSA standards. The fuse panel design places great emphasis on high reliability and simplicity
of operation.
Type 70 Series Power Distribution Panels and provides
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.
© 2001, ADC Telecommunications, Inc.
Page 3
ADCP-80-524 • Issue 1 • November 2001
General Safety Precautions
-
Caution: The fuse panel uses electrical voltage and amperage levels which, per GR-1089, 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 in contact with this
equipment when the panel is energized. Only insulated tools should be used on energized
elements of the panel.
Caution: All fuse panel 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 the same type and must have exactly the same current
rating as the fuse being replaced.
Important Product Features
Both the traditional and uninterrupted fuse panel provide dc power over two separate buses
(feeds). However, with the uninterrupted fuse panel, when one bus loses input power, the other
bus supplies the output power for both buses.
Application: Type 70 series fuse panels are used to supply protected dc power to the various
types of telecommunications products typically used in central offices, multimedia headends,
remote sites, and other locations.
Input Power: Type 70 series fuse panels contain two buses (feeds) that accept –24 Vdc or –48
Vdc input power. The traditional fuse panel is rated at 65 Amps input current per bus for a total
output current of 130 Amps per fuse panel. The uninterrupted fuse panel is rated at 60 Amps
input current per bus but the total output current cannot exceed 60 Amps per panel. During
back-up operation, the uninterrupted can supply an output current of up to 30 Amps per bus or
one half of the 60 Amps input current provided by the working power source.
Output Power: Type 70 series fuse panels provide fuse protected output power with up to 8
fuse positions per bus. The selectable current rating for each fuse can be standard amperage
capacity type 70 fuses up to 10 Amps.
Type 70 series fuse panels incorporate several important features:
• Self-configuring input voltage (–24 Vdc or –48 Vdc) capability with up to 65 Amps per
bus (traditional fuse panel) and 60 Amps per bus (uninterrupted fuse panel) to simplify
installation and allow their use in most dc voltage applications
•A colored indicator that projects from the center of a blown type 70 fuse to quickly and
easily identify the affected fuse position
•Alarm contact connections built into the fuse panel for connection to external visual,
audio, and remote alarms
• Field-replaceable high-brilliance Power-On green and Alarm red LED indicators
• Easily-removable smoked plastic protective cover over connectors to enhance safety and
panel accessibility
• Two-post grounding to ensure robust and reliable ground connectivity
Page 4
© 2001, ADC Telecommunications, Inc.
Standard Equipment
Type 70 series fuse panels have two power buses (feeds). The capacity of each bus is eight fuse
positions with up to 10 Amps per fuse position (within the maximum bus capacity). Each bus
has Power-On and Alarm indicators on the front of the chassis and input, output, ground, and
alarm contact connections on the rear of the chassis.
The current capacity of each bus of the traditional power fuse panel is 65 Amps maximum (130
Amps per panel). The current capacity of each bus of the uninterrupted power fuse panel is 60
Amps maximum (60 Amps per panel).
The power dissipation of each fuse panel is 40 watts maximum at 130 Amps.
The dimensions of each fuse panel are 1.75 inches (4.45 centimeters) high, 17.13 inches (43.51
centimeters) wide, and 10.01 inches (25.42 centimeters) deep (does not include depth of
protective cover and connectors, fuses, and visual indicators that extend beyond the chassis.
Two sets of mounting brackets are provided with each fuse panel, one set for 19-inch (48.3 cm)
rack installations and one set for 23-inch (58.4 cm) rack installations. The fuse panel can be
flush or recess mounted in equipment racks with WECO or EIA hole spacing.
ADCP-80-524 • Issue 1 • November 2001
Options
Accessories
A typical traditional power fuse panel with protective cover in place is shown in Figure1. A typical
uninterrupted power fuse panel with protective cover in place is shown in Figure 2.
Fuse panels are shipped without fuses. The required fuses are available separately as accessory
items.
All fuse panels are available with the following options:
•Two types of output connectors: screw-down terminal strip connectors or set screw barrel
terminal strip connectors
•Two types of input connectors are available: two-hole compression-lug (stud-type) or set
screw barrel connectors
•The fuse panel color is either putty white or black color
The following accessories are available:
• Standard type 70 fuses with standard values from 0.2 Amp to 10.0 Amps
•Cable management bar kit
•Four sizes of compression connector lugs for input power connections
•Fused equipment designation card kit
•Fuse designation card kit
© 2001, ADC Telecommunications, Inc.
Page 5
ADCP-80-524 • Issue 1 • November 2001
UL/CSA/CE
BUS A
FUSE FAILURE
INDICATOR
(RED LED)
BUS A TYPE 70
FUSE HOLDER
(8 PER BUS)
LABEL
BUS A
POWER-ON
INDICATOR
(GREEN LED)
BUS B
FUSE FAILURE
INDICATOR
(RED LED)
BUS B TYPE 70
FUSE HOLDER
(8 PER BUS)
BUS B
POWER-ON
INDICATOR
(GREEN LED)
VENTS
BUS B INPUT
CONNECTORS
(SET SCREW
BARREL TYPE
SHOWN)
Figure 1. PowerWorx Type 70 Traditional Fuse Panel with Protective Cover in Place,
Page 6
© 2001, ADC Telecommunications, Inc.
PROTECTIVE COVER
IN PLACE OVER
OUTPUT POWER, GROUND,
AND ALARM CONTACT
CONNECTIONS
BUS A INPUT
CONNECTORS
(SET SCREW
BARREL TYPE
SHOWN)
UNIVERSAL
MOUNTING BRACKETS (2)
(INSTALLED FOR 19-IN.
(48.76 CM) RACK MOUNTING)
Front and Rear Views (Panel with 8 Fuses Installed on Each Bus Shown)
17067-A
BUS A
FUSE FAILURE
INDICATOR
(RED LED)
BUS A TYPE 70
FUSE HOLDER
(8 PER BUS)
BUS A
FUSE VALUE
DESIGNATION
STRIP
POWER-ON
INDICATOR
(GREEN LED)
BUS A
BUS B
FUSE FAILURE
INDICATOR
(RED LED)
BUS B TYPE 70
FUSE HOLDER
(8 PER BUS)
HEAT SINK
(PATENT PENDING)
BUS B
FUSE VALUE
DESIGNATION
STRIP
BUS B
POWER-ON
INDICATOR
(GREEN LED)
ADCP-80-524 • Issue 1 • November 2001
VENTS
PROTECTIVE COVER IN
PLACE OVER INPUT POWER,
OUTPUT POWER, GROUND,
AND ALARM CONTACT
CONNECTIONS
UNIVERSAL
MOUNTING BRACKETS (2)
(INSTALLED FOR 19-IN.
(48.76 CM) RACK MOUNTING)
Figure 2. PowerWorx Type 70 Uninterrupted Fuse Panel with Protective Cover in Place,
Front and Rear Views (Panel with 8 Fuses Installed on Each Bus Shown)
© 2001, ADC Telecommunications, Inc.
16149-B
Page 7
ADCP-80-524 • Issue 1 • November 2001
1 GENERAL CHARACTERISTICS AND FEATURES
This section describes the general characteristics and features of the traditional and
uninterrupted fuse panels. The front of a typical traditional power fuse panel is shown in
Figure 3. The front of a typical uninterrupted power fuse panel is shown in Figure 4. The rear
side of the traditional power fuse panel (with protective cover removed to view the optional
connections) is shown in Figure 5. The rear side of the uninterrupted power fuse panel (with the
protective cover removed to view the optional connections) is shown in Figure 6. Options and
features other than those described may be available by special order.
BUS A
FUSE FAILURE
INDICATOR
(RED LED)
Figure 3. ADC PowerWorx Type 70 Traditional Fuse Panel, Front View
BUS A
FUSE FAILURE
INDICATOR
(RED LED)
BUS A TYPE 70
FUSE HOLDER
(8 PER BUS)
BUS A
POWER-ON
INDICATOR
(GREEN LED)
BUS B
FUSE FAILURE
INDICATOR
(RED LED)
BUS B TYPE 70
FUSE HOLDER
(Panel with 8 Fuses Installed on Each Bus Shown)
BUS A
FUSE VALUE
DESIGNATION
STRIP
BUS A
POWER-ON
INDICATOR
(GREEN LED)
BUS B
FUSE FAILURE
INDICATOR
(RED LED)
(8 PER BUS)
BUS B
FUSE VALUE
DESIGNATION
STRIP
BUS B
POWER-ON
INDICATOR
(GREEN LED)
BUS B
POWER-ON
INDICATOR
(GREEN LED)
16151-B
Page 8
© 2001, ADC Telecommunications, Inc.
BUS A TYPE 70
FUSE HOLDER
(8 PER BUS)
BUS B TYPE 70
FUSE HOLDER
(8 PER BUS)
Figure 4. PowerWorx Type 70 Uninterrupted Fuse Panel, Front View
(Panel with 8 Fuses Installed on Each Bus Shown)
16152-B
ADCP-80-524 • Issue 1 • November 2001
BUS B INPUT
CONNECTORS
(TWO HOLE
COMPRESSION
LUG-STUD TYPE) (2)
TO
BATTERY
B
TO
RETURN
B
BATTERY B
OUTPUT POWER
CONNECTORS (SET
SCREW BARREL
TERMINAL TYPE)
BATTERY B
OUTPUT RETURN
CONNECTORS (SET
SCREW BARREL
TERMINAL TYPE)
PROTECTIVE COVER
MOUNTING STANDOFFS
(2 SETS OF 4)
BUS A AND BUS B
ALARM CONTACT
CONNECTOR
(WIRE-WRAP PIN
BLOCK TYPE)
CHASSIS
GROUND
TERMINALS
BATTERY A
OUTPUT POWER
CONNECTORS (SET
SCREW BARREL
TERMINAL TYPE)
BATTERY A
OUTPUT RETURN
CONNECTORS (SET
SCREW BARREL
TERMINAL TYPE)
BUS A INPUT
CONNECTORS
(TWO HOLE
COMPRESSION
LUG-STUD TYPE) (2)
TO
BATTERY
A
TO
RETURN
A
16155-A
Figure 5. PowerWorx Type 70 Fuse Panel, Rear View with Protective Cover Removed (Panel with
Compression Lug Input Connectors and Set Screw Barrel Terminal Strip Output Connectors Shown)
BUS B INPUT CONNECTORS
(SET SCREW BARREL TYPE)
BUS B OUTPUT POWER
TO
BATTERY
B
TO
RETURN
B
INTERNAL
CONNECTIONS.
DO NOT REMOVE
CAPS OR
TURN SCREWS
CONNECTORS (SCREW-
DOWN BARRIER
TERMINAL STRIP TYPE)
PROTECTIVE COVER
MOUNTING STANDOFFS
BUS B OUTPUT RETURN
CONNECTORS (SCREW-
DOWN BARRIER
TERMINAL STRIP TYPE)
(2 SETS OF 2)
BUS A AND BUS B
ALARM CONTACT
CONNECTOR
(WIRE-WRAP PIN
BLOCK TYPE)
CHASSIS
GROUND
TERMINALS
BUS A OUTPUT POWER
CONNECTORS (SCREW-
DOWN BARRIER
TERMINAL STRIP TYPE)
BUS A OUTPUT RETURN
CONNECTORS (SCREW-
DOWN BARRIER
TERMINAL STRIP TYPE)
BUS A INPUT CONNECTORS
(SET SCREW BARREL TYPE)
TO
BATTERY
A
INTERNAL
CONNECTIONS.
DO NOT REMOVE
CAPS OR
TURN SCREWS
TO
RETURN
A
16154-B
Figure 6. PowerWorx Type 70 Fuse Panel, Rear View with Protective Cover Removed (Panel with Set
Screw Barrel Input Connectors and Screw-Down Barrier Terminal Strip Connectors Shown)
© 2001, ADC Telecommunications, Inc.
Page 9
ADCP-80-524 • Issue 1 • November 2001
1.1 Power Buses
Each fuse panel has two separate power buses (feeds). Each bus distributes the input power to
the output power circuits. In each bus circuit, current flows from the input power bus, through
the fuse, to the output power circuit. A typical fuse panel block diagram is shown in Figure 7.
The current capacity of each bus of the traditional power fuse panel is 65 Amps maximum. The
output fusing of the traditional fuse panel should not exceed 65 Amps per bus. This provides a
total capacity of 130 Amps per panel. The maximum current per bus is marked on the fuse
panel.
The current capacity of each bus of the uninterrupted power fuse panel is 60 Amps maximum.
However, the output fusing of the uninterrupted fuse panel should not exceed 30 Amps per bus.
This provides a total capacity of 60 Amps per panel. The maximum current per bus is marked
on the fuse panel.
Each of the feed buses has a capacity of eight fuse positions. Other fuse capacity configurations
may be available by special order. When a fuse fails, the input power bus is disconnected from
the corresponding output circuit. This causes the alarm LED for the bus to light and also opens
or closes the alarm relay contacts (form C contacts).
1.2 Redundant Power (Uninterrupted Power Fuse Panel)
The uninterrupted power fuse panel provides redundant power to fused equipment through the
use of Schottky steering diodes. When power to one bus is interrupted, the Schottky steering
diodes enable the other bus to supply power to the entire fuse panel and to maintain output
power for both buses (bus A and bus B). If bus A loses power, bus B will support the power load
of bus A while maintaining its original power load. Likewise, if bus B loses power, bus A will
support the power load of bus B while maintaining its original power load.
1.3 Input Voltage
The fuse panel can accommodate either –24 Vdc on both buses or –48 Vdc on both buses. The
voltage level is sensed by the fuse panel circuitry. The input voltage used with the fuse panel can
have the following characteristics:
• –24 Vdc nominal, within range of –21 Vdc to –30 Vdc
• –48 Vdc nominal, within range of –42 Vdc to –56 Vdc
Fuse panels for use with other input voltage and polarity power may be available by special
order.
Page 10
© 2001, ADC Telecommunications, Inc.
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