American Power Conversion MX28B4800, MX28B2400 User Manual
MX28B1200/2400
MX28B1200/4800
-48 VDC POWER SYSTEMS
User’s Manual
(Document # 990-1148A)
Table of Contents
1 SAFETY FIRST! .....................................................................................................................1
1.1. WARNING SYMBOLS .........................................................................................................1
1.2. GENERAL PRECAUTIONS: ..................................................................................................1
2 INTRODUCTION ....................................................................................................................2
2.1. GENERAL INFORMATION....................................................................................................2
2.2. HOW TO USE THIS MANUAL ..............................................................................................2
3 INSTALLATION .....................................................................................................................5
3.1. UNPACKING EQUIPMENT ...................................................................................................5
3.2. MECHANICAL INSTALLATION ..............................................................................................5
Room / Location......................................................................................................................5
Mounting.................................................................................................................................6
Power Bus Connections .........................................................................................................6
Circuit Breaker/LVD Ribbon Cable Connections.....................................................................8
Fuse Alarm Ribbon Cable Connections..................................................................................9
Ventilation...............................................................................................................................9
3.3. AC POWER CONNECTIONS ...............................................................................................9
3.4. BATTERY CONNECTIONS .................................................................................................11
Planning the Battery Installation ...........................................................................................11
Connecting the Battery Cables .............................................................................................12
3.5. DC SYSTEM GROUNDING ...............................................................................................13
3.6. DC POWER OUTPUT OVER-CURRENT PROTECTION..........................................................14
DC Plug-in Circuit Breakers..................................................................................................14
DC Bolt-in Circuit Breakers...................................................................................................17
Telecom Fuses .....................................................................................................................18
3.7. I
Plug-in Circuit Breaker Installation........................................................................................19
Bolt-in Circuit Breaker Installation.........................................................................................20
Telecom Fuse Installation.....................................................................................................21
GMT Fuse Installation...........................................................................................................21
3.8. LOAD CONNECTIONS ......................................................................................................22
Cable Size Considerations ...................................................................................................22
Circuit Breaker Connections (1 to 50 Amps).........................................................................22
Circuit Breaker Connections (60-100 Amps) ........................................................................22
Return Connections (1-100 Amps) .......................................................................................22
GMT Fuse Connections........................................................................................................23
3.9. M
Front Panel DB9 Connection ................................................................................................23
“Smart” Cable DB9 Connection ............................................................................................23
RJ45 Ethernet Connector .....................................................................................................24
Relay Output Connections....................................................................................................24
NSTALLATION OF CIRCUIT BREAKERS AND FUSES.............................................................19
ONITORING AND RELAY OUTPUT CONNECTIONS .............................................................23
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page ii
3.10. EXTERNAL ALARM INPUT CONNECTIONS ..........................................................................25
3.11. RECTIFIER MODULE INSTALLATION...................................................................................26
4 COMMISSIONING AND PREVENTIVE MAINTENANCE ....................................................27
4.1. PRE-COMMISSIONING INSPECTION...................................................................................27
Environment..........................................................................................................................27
Electrical Installation .............................................................................................................27
Battery Visual and Safety Inspection ....................................................................................27
4.2. COMMISSIONING.............................................................................................................28
Initial Set-up..........................................................................................................................28
AC Power Up........................................................................................................................28
DC Power Up:.......................................................................................................................29
Rectifier Test:........................................................................................................................29
LVD Test...............................................................................................................................29
Battery Power Up..................................................................................................................29
Circuit Breaker/ Fuse Test: ...................................................................................................30
User Inputs ...........................................................................................................................30
Output Relays: ......................................................................................................................30
Battery Temperature Compensation.....................................................................................30
4.3. FINAL INSPECTION:.........................................................................................................31
5 OPERATION ........................................................................................................................32
5.1. TECHNICAL DESCRIPTION................................................................................................32
5.2. RECTIFIER MANAGEMENT................................................................................................32
AC Input Power.....................................................................................................................32
DC Output Power..................................................................................................................32
Rectifier alarms reporting......................................................................................................32
5.3. SYSTEM MANAGEMENT ...................................................................................................33
System Output Capacity .......................................................................................................33
System Voltage Control ........................................................................................................33
System Current.....................................................................................................................33
System Status and Alarm Reporting.....................................................................................34
5.4. DC D
5.5. B
ISTRIBUTION ..........................................................................................................34
ATTERY MANAGEMENT .................................................................................................34
Battery Charging and Protection...........................................................................................34
Battery/Load Low Voltage Disconnect ..................................................................................35
5.6. C
ONTROLS AND INDICATORS ...........................................................................................35
Front Panel User Interface....................................................................................................35
Parameter Locations, Descriptions, and Default Values.......................................................36
Control Unit Menu Structure .................................................................................................46
Front Panel LED Indicators...................................................................................................52
5.7. ALARM OUTPUTS (OUTPUT RELAYS)................................................................................52
5.8. EXTERNAL ALARM INPUTS (INPUT RELAYS) ......................................................................53
6 REMOTE MONITORING ......................................................................................................54
6.1. D
6.2. P
ESCRIPTION.................................................................................................................54
HYSICAL CONNECTIONS ................................................................................................54
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page iii
6.3. COMMAND AND MONITORING PROTOCOL .........................................................................54
7 PREVENTIVE MAINTENANCE............................................................................................55
7.1. EQUIPMENT ...................................................................................................................55
7.2. INSPECTION ...................................................................................................................55
Environmental Inspection .....................................................................................................55
System Visual and Safety Inspection....................................................................................55
Battery Visual and Safety Inspection ....................................................................................56
7.3. TEST .............................................................................................................................56
System Voltage Test.............................................................................................................56
Rectifier Current Test............................................................................................................56
Rectifier Current Share Test .................................................................................................57
System Current Test.............................................................................................................57
Rectifier Alarm Test ..............................................................................................................57
System Temperature Test ....................................................................................................57
Battery Current Test .............................................................................................................57
Battery Temperature Test.....................................................................................................58
LVD Test...............................................................................................................................58
Battery Preventive Maintenance Procedure .........................................................................58
7.4. FINAL INSPECTION:.........................................................................................................59
8 SPECIFICATIONS................................................................................................................60
8.1. AC INPUT ......................................................................................................................60
1MRF28H54BV Rectifiers.....................................................................................................60
1MRF28H54BV50 Rectifiers.................................................................................................60
8.2. DC OUTPUT (WITH EITHER 1MRF28H54BV RECTIFIERS AND 1MRF28H54BV50
RECTIFIERS) ..............................................................................................................................61
8.3. CONTROLS AND INDICATORS ...........................................................................................61
Rectifiers...............................................................................................................................61
Power Shelf Control Unit ......................................................................................................62
8.4. M
ECHANICAL .................................................................................................................63
8.5. ENVIRONMENTAL ............................................................................................................63
8.6. COMPLIANCE .................................................................................................................63
9 APC WORLDWIDE CUSTOMER SUPPORT.......................................................................64
10 LIMITED PRODUCT WARRANTY....................................................................................65
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page iv
Revision History
Revision Date By Description
1 31 JAN, 2002 JNF Converted to APC numbering
2 28 SEP, 2003 BET Updated Format and added 4800
Table of Figures
FIGURE 2.2-1 MX28B-1200 –48 VDC POWER PLANT RECTIFIER BAY.............................................3
FIGURE 2.2-2 MX28B BLOCK DIAGRAM ...............................................................................................4
FIGURE 3.2-1 FLOOR MOUNTING DIMENSIONS .................................................................................6
FIGURE 3.2-2 MX28B-1200-2400 HAS A MAXIMUM CAPACITY OF 2400 AMPS.............................7
FIGURE 3.2-3 THE MX28B1200-4800 CAN BE EXPANDED TO 4800 AMPS. .....................................7
FIGURE 3.2-4 SPLICE PLATE INSTALLATION ......................................................................................7
FIGURE 3.2-5 CIRCUIT BREAKER / LVD EXPANSION BOARD .........................................................8
FIGURE 3.2-6 WAGO FUSE ALARM BREAKOUT BOARD ..................................................................9
FIGURE 3.3-1 AC INPUT WIRING...........................................................................................................10
FIGURE 3.4-1 BATTERY CABLE CONNECTION LOCATIONS..........................................................12
FIGURE 3.4-2 BATTERY PROBE CONNECTION..................................................................................13
FIGURE 3.4-3 BATTERY PROBE INSTALLATION ..............................................................................13
FIGURE 3.5-1 DC SYSTEM GROUNDING .............................................................................................14
FIGURE 3.5-2 BOX FRAME GROUND....................................................................................................14
FIGURE 3.6-1 DC DISTRIBUTION (FRONT COVER OPENED) ..........................................................15
FIGURE 3.6-2 PLUG-IN CIRCUIT BREAKERS ......................................................................................16
FIGURE 3.6-3 PLUG-IN CIRCUIT BREAKER KITS ..............................................................................16
FIGURE 3.6-4 BOLT-IN CIRCUIT BREAKERS ......................................................................................17
FIGURE 3.6-5 TELECOM FUSES .............................................................................................................18
FIGURE 3.7-1. INSTALLATION OF CIRCUIT BREAKERS..................................................................19
FIGURE 3.7-2 CIRCUIT BREAKER ALARM WIRING..........................................................................20
FIGURE 3.7-3 GMT FUSE TEMPERATURE DE-RATING CHART......................................................21
FIGURE 3.8-1 LOAD CONNECTIONS FOR SNAP-IN BREAKERS .....................................................23
FIGURE 3.8-2 RETURN CONNECTIONS................................................................................................23
FIGURE 3.9-1 INTERFACE BOARD........................................................................................................24
FIGURE 3.9-2 OUTPUT RELAY CONNECTIONS..................................................................................25
FIGURE 3.10-1 EXTERNAL ALARM INPUT DEFINITION ..................................................................25
FIGURE 3.10-2 EXTERNAL ALARM INPUT CONNECTIONS ............................................................25
FIGURE 5.6-1 MENU TOP LINE ..............................................................................................................36
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page v
1 Safety First!
It is very important to follow all safety procedures when unpacking, installing and operating any
sort of power equipment.
1.1. Warning Symbols
CAUTION: An indication that special care is required to prevent injury,
equipment damage or misuse
WARNING: An indication of an electrical hazard that may cause serious
1.2. General Precautions:
personal injury or death, catastrophic equipment damage or site destruction.
WARNING: The DC power plant is supplied from a nominal 220VAC, 50/60
Hz source. Keep the AC input enclosure cover in place when the system is
operational or energized
WARNING: Hazardous energy levels are present on bare conductors in the 48VDC distribution connection area of the plant. Accidental shorting of
Specific CAUTION and WARNING will be placed in manual where appropriate.
distribution conductors can cause arcing and high currents that can cause
serious burns or other physical harm. It is recommended that:
a. Any jewelry, rings or watches be removed while working on this
equipment.
b. Handles of all wrenches, screwdrivers, cutters and pliers are insulated.
WARNING: Ensure that all of the DC and external AC circuit breakers are in
the OFF position prior to connecting service to the power plant. Confirm that
all voltages have been removed including any battery sources before
proceeding
.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 1
2 Introduction
2.1. General Information
DC Power Plants from APC have unique features that make them easy to install, maintain, and
upgrade. The rectifier units are modular and truly “hot-pluggable” into the shelf assembly
without any separate AC wiring. All system settings are made from the system control unit that
provides monitoring and control functions for each component of the system as well as alarm
listings for system diagnosis and maintenance.
The APC Model MX28B is a modular stand-alone -48V DC power plant. It is configurable in
such a manner that it will support most typical applications within the specified current ranges
(50-4800 amperes) without special application engineering or assistance. Distribution can be
included for a variety of circuit breakers or Telecom style fuses. These circuit breakers can be 1
to 700 amps. Fuses can be 70 to 600 amps. An optional low voltage disconnect (LVD) can be
provided on either the battery or the load side. A 1200 amp MX28B Rectifier Bay is shown in
Figure 2.2-1. A block diagram is shown in Figure 2.2-2.
2.2. How to Use This Manual
Each section of this manual can be read in any order and should provide a complete
explanation of the subject described by the title. However, the sequence of the sections is
designed to provide a typical step-by-step process for successful use of the equipment.
Figure 2.2-1 MX28B-1200 –48 VDC Power Plant Rectifier Bay
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 3
Figure 2.2-2 MX28B Block Diagram
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 4
3 Installation
3.1. Unpacking Equipment
Remove equipment from packing material and inspect for shipping damage or missing items. It
is important to report damage or material shortages to the shipping carrier while a
representative is on site.
If concealed damage or material shortages are found at a later time, contact the shipper to
make arrangements for inspection and claim filing. Refer to Section 7 in the event it is
necessary to return equipment to APC.
CAUTION: Appropriate lifting techniques and safety equipment should be
used to remove equipment from packing.
PLEASE RECYCLE: The shipping materials can be recycled. Please save
them for later use or dispose accordingly.
3.2. Mechanical Installation
Room / Location
NOTE: The APC Model MX28B DC power plant is to be installed in a room, vault, or similar
enclosure that is accessible only to qualified persons in accordance with the NEC or the
authority having jurisdiction.
Prior to installation, drawings, floor loading requirements, external alarm points, AC service
entrance, and grounding schemes should all be checked and confirmed. If batteries are to be
mounted in a room separate from the power plant, careful attention should be paid to battery
cable voltage drop effects. Environmental operating temperatures and ventilation/cooling
considerations should also be noted, not just for the power system but also for all other
equipment that may reside in the power room area.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 5
Mounting
The box frame housing the MX28B components is self-supporting, but designed to be bolted to
the floor of the housing structure. Figure 3.2-1 shows the footprint of the box frame and the
mounting points with dimensions (shown in inches). Consult the system design specifications to
see if it is necessary to electrically isolate the frame from the floor structure. This is required in
many installations.
Figure 3.2-1 Floor Mounting Dimensions
Systems with multiple box frames are mounted with each frame touching, side by side. The
side cover panels where two frames touch are removed so that bus work and control cables can
pass between the frames. Three holes are provided in center vertical rail of each side to allow
the frames to be mechanically secured to each other if desired.
Power Bus Connections
At the top of each bay there are 3 power buses that transfer the power from 1 bay to another.
The system is rated such that the entire load can be run from a fuse or circuit breaker bay
mounted next to the rectifier bays. The MX28B-1200/2400 has a maximum of two rectifier bays.
The MX28B-1200/4800 can be expanded to four rectifier bays. The power buses are connected
together in each bay by splicing the buses together. The MX28B1200/2400 is a 1200 Amp
system expandable to 2400 Amps. The MX28B-1200/4800 is a 1200 Amp system expandable
to 4800 Amps. Each MX28B-1200/2400 power bus is comprised of 2 laminations of 5” X 1/4”
bus. See Figure 3.2-2 for details. Each MX28B-1200/4800 power bus is comprised of 3
laminations of 6” X 1/4” bus. See Figure 3.2-3 for details. The power bays are spliced together
with splice plates provided with each expansion bay. The size and thickness of the splice plates
must match the power bus. See Figure 3.2-4 for details.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 6
Figure 3.2-2 MX28B-1200-2400 has a maximum
capacity of 2400 Amps.
Figure 3.2-4 Splice Plate Installation
Figure 3.2-3 The MX28B1200-4800 can be
expanded to 4800 Amps.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 7
Circuit Breaker/LVD Ribbon Cable Connections
Additional cables must be connected between cabinets to ensure that the circuit breaker alarms
in the expansion bays are reported correctly. The circuit breakers and LVDs are connected
together through the use of a Circuit Breaker / LVD Expansion Board. The ribbon cables on the
left hand side of the board go to the bay to the left. The ribbon cables on the right hand side of
the board go to the bay to the right. If there is an open Alarm Contact Bus connector (no bay to
the side of the unit) the cable connector is left open and no further action is required. However if
the LVD Bus ribbon cable connector is open, the pins nearest the connector will have to be
jumpered. Install the jumpers using Figure 3.2-5 as a guide to jumper orientation. If a cable is
installed remove the jumpers on the pins nearest the installed ribbon cable.
Figure 3.2-5 Circuit Breaker / LVD Expansion Board
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 8
Fuse Alarm Ribbon Cable Connections
There is a 16-conductor ribbon cable, if any bay has fuses installed. This cable ties together the
Wago breakout board in each bay with fuses. The ribbon cable must connect all the Wago
breakout boards together with one ribbon cable. The idea is that each fuse will have one wire in
the ribbon cable for the alarm. Two fuse alarm wires should not be connected to the same fuse.
See Figure 3.2-6 for details. Ribbon cable pin 1 is for Fuse 1. Ribbon cable pin 2 is for Fuse 2
etc.
Figure 3.2-6 Wago Fuse Alarm Breakout Board
Ventilation
The rectifier modules for this system have fans that provide front-to-rear airflow for internal
cooling. The MX28B housing should mounted such that there is free airflow to the front and top
of the unit. [Refer to Section 8.5 for environmental characteristics.] Free airflow should be
ensured so that the power system can provide full power without de-rating.
3.3. AC Power Connections
WARNING: Ensure that all of the external DC and AC circuit breakers are in
the OFF position prior to connecting service to the power plant. Confirm that
The MX28B DC power plant requires the supply of 208/220/240/277 VAC single-phase, 50/60
Hz power through individual external 20-amp circuit breakers to the AC input terminal block
connections for each rectifier module in the system. Two rectifier modules are required to
accommodate the full AC input voltage range. The 1MRF28H54BV rectifier is designed for the
standard 208/220/240 VAC input service, while the 1MRF28H54BV50 is used for the 277 VAC
all voltages have been removed including any battery sources before
proceeding
.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 9
input. The AC wiring, from the AC input terminal block connections to the hot-pluggable AC
input connector for each rectifier, is factory installed.
The AC input enclosure, located at the top rear of the MX28B rectifier bay, is provided with nine
¼ -inch pilot holes in the top plate. Remove the ac input enclosure from the box frame in order
to punch or drill the appropriate number of conduit openings for the conduit size(s) desired. Do
not leave the ac input enclosure in place when punching or drilling holes in order to prevent
metal pieces from falling into the power system.
AC wiring passing through the conduit will be routed through the access opening in the ac input
enclosure into the vertical wiring channel where safety ground bar and rectifier input terminal
blocks are located. The terminal block(s) is labeled as Rectifier 1 through Rectifier 4 with each
position having inputs designated “L1” and “L2/N” for connection of the two ac wires Figure
3.3-1. Each terminal block represents connections for one shelf, with positions 1 through 4
corresponding to the rectifier shelf positions numbered from left to right as viewed from the front.
Figure 3.3-1 AC Input Wiring
The suggested wire size is #10 AWG rated at 90°C or higher; however, the ambient temperature
and number of wires in a conduit must also be considered in accordance with NEC
requirements. It is suggested that feeds for four rectifiers (8 wires) and one safety ground wire
be run in a one-inch conduit; however, be sure to follow any local electrical wiring codes.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 10
If the AC input power is provided from a three-phase distribution panel, the circuit breaker
positions should be selected such that the load is balanced as much as possible.
WARNING: The MX28B DC power plant is supplied from a high voltage
source. Keep the AC input enclosure in place when the system is operational
or energized.
3.4. Battery Connections
WARNING: Hazardous energy levels are present on bare conductors in the -
48VDC distribution connection area of the plant. Accidental shorting of
distribution conductors can cause arcing and high currents that can cause
serious burns or other physical harm. It is recommended that:
Planning the Battery Installation
The battery cable(s) should be sized sufficiently large to limit the voltage drop from the MX28B
DC power plant to the battery during charging per system design requirements. The cable(s)
must also carry the full load current during battery operation. If assistance is required to
determine the necessary cables for the application, contact your sales representative or APC.
An external fuse or circuit breaker (various options are available from APC) is recommended in
the negative line (located at the battery end) to protect the cables from the battery to the MX28B
DC power plant. The power plant can monitor auxiliary contacts from this breaker.
c. Any jewelry, rings or watches be removed while working on this
equipment.
d. Handles of all wrenches, screwdrivers, cutters and pliers are insulated.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 11
Connecting the Battery Cables
WARNING: Make certain that the battery polarity is correct when making
connections to the Model MX28B DC power plant. Incorrect connection
could cause severe equipment damage.
The battery cable connections are located at the top rear of the unit as shown in Figure 3.4-1.
The battery positive (return bus) and battery negative (-48V bus) buses each provide four sets
of 3/8” holes on one-inch or 1-3/4” centers for connecting two-hole battery cable lugs. Connect
the battery cables as applicable using 3/8-16 bolts (not provided) and tighten them with a torque
wrench to 200 in-lbs (23 N-m).
Figure 3.4-1 Battery Cable Connection Locations
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 12
Battery Temperature Probe Installation
The optional temperature probe is used to monitor the battery string temperature. To get the
most representative temperature measurement, the probe should be placed in contact with a
battery cell that is centrally located. The probe should be placed directly in contact with the cell
(not the frame surrounding the cell). Generally, the cell cover can be used; be careful not to
allow the probe body to touch the terminals. Remove the adhesive protection strip from the
probe body and press the adhesive side of the probe on the battery cell cover. See Figure 3.4-3
for details. Plug the connector end of the temperature probe into J5 of the control unit
backplane card. Route the cable as required positioning the probe on the selected battery cell.
See Figure 3.4-2 for Details.
Figure 3.4-2 Battery Probe Connection
Figure 3.4-3 Battery Probe Installation
3.5. DC System Grounding
The Positive Battery connection (return bus) for the power plant must be connected to the
Master Station Ground. The return bus provides 3/8” holes on 1 inch or 1-3/4 inch centers for
connection of a two-hole lugged cable to the Central Office Ground. Details for this connection
should be provided in the site electrical grounding plans.
A connection to tie the frames together is also available. At the top of both sides of the box
frame is a pair of studs for connecting a grounding cable. This #6 AWG cable is provided with
each expansion frame.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 13
Figure 3.5-1 DC System Grounding
Figure 3.5-2 Box Frame Ground
3.6. DC Power Output Over-Current Protection
There are several different options for DC output power distribution. Distribution provides a
convenient method of connecting the load cables as well as over-current protection.
DC Plug-in Circuit Breakers
A standard 48-position plug-in circuit breaker tier provides -48V distribution. Various circuit
breaker sizes from 1 to 100 amps are available, with 60-100 amp breakers requiring two
positions and a circuit breaker adapter kit. Each rectifier bay has two 24-position breaker tiers.
Each breaker tier is connected at its center to the -48V DC bus, and each side of the tier has a
total current capacity of 300A. Each breaker tier has a total current capacity of 600A. Each
rectifier bay has a total current capacity of 1200A. It is therefore necessary to balance the load
on the rectifier bay to avoid overloading any section of the output bus. Also when planning the
output installation, take into consideration the configuration of the plant and the number of
rectifiers installed.
Any combination of up to 48 single (1-50 Amp) or up to 24 double (60-100 Amp) breakers may
be installed. If all rectifier bays are installed with snap-in breakers, up to 192 single or 96 double
breakers may be installed. In the main bay a pair of ribbon cables routed directly to the
controller backplane handles alarming. In the expansion bays, each 24-breaker tier is alarmed
as a group of breakers. A two-pin connector on each tier connects to the Circuit Breaker
expansion board in each bay. Circuit breaker alarms can be monitored by attaching the other
end of the alarm wire to the gray Wago connector on the Circuit Breaker / LVD Expansion
board. Since the normally open contacts are monitored, any tripped breaker will give an alarm.
Install the alarm wire in the Wago connector on the expansion board. Jumper the pins behind
the Wago connectors based on what bay the circuit breaker tiers are in. Typical circuit breaker
numbering is bay 1: Cir Bkr 1-48, Bay 2: Cir Bkr 49-50, Bay 3: Cir Bkr 51-52 and Bay 4: Cir Bkr
53-54. Figure 3.6-1 shows the power plant’s main bay (with ribbon cables) DC distribution
section with the front cover opened.
Figure 3.6-1 DC Distribution (Front Cover Opened)
Available plug-in circuit breakers are shown in Figure 3.6-2. These are only breakers and do
not include any hardware.
Plug-in circuit breakers rated at 60A or more require two mounting positions and require a circuit
breaker adapter, which is included in the circuit breaker kit. Adaptors are available with studs
for #10-32 nuts on 5/8” centers, #10-32 nuts on ¾” centers, or ¼-20 nuts on 1” centers. The
circuit breaker kit includes all necessary mounting hardware. Available plug-in circuit breakers
are shown in Figure 3.6-2.
BREAKER
RATING
PART NUMBER
BREAKER
RATING
PART NUMBER
1 A FFA-0014 40 A FFA-0020
3 A FFA-0015 50 A FFA-0025
5 A FFA-0016 60 A 530-9088
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 15
10 A FFA-0017 70 A 530-9089
15 A 530-9093 80 A 530-9090
20 A FFA-0018 100 A 530-9091
30 A FFA-0019
Figure 3.6-2 Plug-in Circuit Breakers
BreakerRating Part Number Adaptor Size
60 A FFA-0021-1 #10 studs on 5/8” centers
60 A FFA-0021-2 #10 studs on ¾” centers
60 A FFA-0021-3 ¼” studs on 1” centers
70 A FFA-0022-1 #10 studs on 5/8” centers
70 A FFA-0022-2 #10 studs on ¾” centers
70 A FFA-0022-3 ¼” studs on 1” centers
80 A FFA-0023-1 #10 studs on 5/8” centers
80 A FFA-0023-2 #10 studs on ¾” centers
80 A FFA-0023-3 ¼” studs on 1” centers
100 A FFA-0024-1 #10 studs on 5/8” centers
100 A FFA-0024-2 #10 studs on ¾” centers
100 A FFA-0024-3 ¼” studs on 1” centers
Figure 3.6-3 Plug-in Circuit Breaker Kits
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 16
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