DC POWER PLANT
PRODUCT MANUAL
MODEL MX28B-1200/2400
APC DC Network Solutions Inc. Division
11035 Switzer Avenue
Dallas, TX 75238 Part Number PML-0218
800-800-4APC Revision (B)
MX28B-1200 PRODUCT MANUAL Revision B
ii MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
REVISION HISTORY
Revision Date By Description
Preliminary 05/19/2000 SCG Preliminary release.
A 06/30/2000 SCG Various corrections and typos.
B 01-16-01 JNF Replaced Advance with APC. Changed 1-800
number. Added ESD caution
MX28B-1200/2400 iii
MX28B-1200 PRODUCT MANUAL Revision B
TABLE OF CONTENTS
1. GENERAL INFORMATION........................................................................................................................... 1
NTRODUCTION................................................................................................................................................ 1
1.1 I
1.2 P
RECAUTIONS.................................................................................................................................................. 1
1.3 I
NSPECTION UPON RECEIPT OF GOODS ............................................................................................................ 1
1.3.1 General.................................................................................................................................................. 1
1.3.2 Visible External Damage ...................................................................................................................... 1
1.3.3 Concealed Damage ............................................................................................................................... 2
1.3.4 Return of Damaged Goods.................................................................................................................... 2
2. CUSTOMER SERVICE AND SUPPORT ...................................................................................................... 3
3. WARRANTY PROVISIONS ........................................................................................................................... 5
3.1 G
ENERAL PROVISIONS..................................................................................................................................... 5
3.1.1 Warranty Returns .................................................................................................................................. 5
3.1.2 Warranty Repair or Replacement.......................................................................................................... 5
3.2 E
XCLUSIONS AND LIMITATIONS ...................................................................................................................... 5
4. PRODUCT OVERVIEW AND TECHNICAL DESCRIPTION................................................................... 7
4.1 D
4.2 P
4.3 R
4.4 C
4.5 AC I
4.6 B
4.7 DC D
4.8 E
4.9 M
4.10 C
ESCRIPTION................................................................................................................................................... 7
OWER OUTPUT CAPACITY ............................................................................................................................. 9
ECTIFIERS...................................................................................................................................................... 9
ONTROL UNIT................................................................................................................................................ 9
NPUT POWER.......................................................................................................................................... 10
ATTERY CONNECTIONS................................................................................................................................ 10
ISTRIBUT ION ......................................................................................................................................... 10
NVIRONMENTAL .......................................................................................................................................... 11
ECHANICAL ................................................................................................................................................ 11
OMPLIANCE ........................................................................................... ERROR! BOOKMARK NOT DEFINED.
5. INSTALLATION PROCEDURES ................................................................................................................ 13
5.1 P
REPARATION................................................................................................................................................ 13
5.1.1 Recommended Tools............................................................................................................................ 13
5.1.2 Recommended Test Equipment............................................................................................................ 13
5.1.3 Equipment Inspection.......................................................................................................................... 13
5.1.4 Safety Precautions............................................................................................................................... 13
5.1.5 Room/Locations................................................................................................................................... 14
5.1.6 Mounting ............................................................................................................................................. 14
5.1.7 Ventilation........................................................................................................................................... 15
5.2 AC S
5.3 B
ERVICE AND GROUND CONNECTIONS.................................................................................................... 15
ATTERY CONNECTIONS ............................................................................................................................... 17
5.3.1 Battery Disconnect .............................................................................................................................. 17
5.3.2 Cable Sizing Considerations ............................................................................................................... 17
5.3.3 Connecting the Cables ........................................................................................................................ 17
5.4 DC SYSTEM GROUNDING....................................................................................................................... 17
5.5 R
5.6 M
ECTIFIER INSTALLATION ............................................................................................................................. 18
ULTIPLE FRAME ASSEMBLY ....................................................................................................................... 18
5.6.1 Power Bus Connections ...................................................................................................................... 18
5.6.2 Control Wiring .................................................................................................................................... 19
5.7 A
LARM CONNECTIONS .................................................................................................................................. 23
5.7.1 External Alarm Inputs ......................................................................................................................... 24
5.7.2 Alarm Outputs ..................................................................................................................................... 24
5.8 C
ONNECTING THE LOADS.............................................................................................................................. 25
5.8.1 DC Circuit Breakers and Fuses .......................................................................................................... 25
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5.8.2 Installation of Circuit Breakers and Fuses ......................................................................................... 26
5.8.2.1 Plug-in Circuit Breakers ..................................................................................................................................26
5.8.2.2 Circuit Breaker Load Connections...................................................................................................................27
5.8.2.3 Power Distribution Fuse Load Connections ..................................................................................................... 27
5.9 BATTERY TEMPERATURE PROBE INSTALLATION........................................................................................... 28
OWER-UP AND CHECKOUT .......................................................................................................................... 28
5.10 P
5.10.1 Apply AC Power.................................................................................................................................. 28
5.10.2 System Parameters Verification/Adjustment ....................................................................................... 29
5.10.3 Full System Power Up......................................................................................................................... 29
6. SETUP, ADJUSTMENTS, AND OPERATION ........................................................................................... 31
6.1 U
6.2 E
6.3 A
6.4 P
SER INTERFACE ........................................................................................................................................... 31
XTERNAL ALARM INPUTS ............................................................................................................................ 32
LARM OUTPUT RELAYS .............................................................................................................................. 32
ARAMETER LOCATIONS, DESCRIPTIONS, AND DEFAULT VALUES................................................................ 32
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Revision B MX28B-1200 PRODUCT MANUAL
1. GENERAL INFORMATION
1.1 Introduction
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 international network of sales and service offices and qualified representatives
provides sales assistance for proposals, purchases, and after-sales support.
APC provides nationwide 24-hour, 7-day service response by dialing:
(800) 800-4APC
This service will answer your call, gather specific service information, and have a qualified APC
service representative contact you as quickly as possible (refer to section on customer service
and support).
1.2 Precautions
It is extremely important to read, understand, and strictly follow the instructions in
sections on installation and setup. Also, please note the special SAFETY PRECAUTIONS
outlined in Section 5.1.4 before beginning actual installation of the power system.
If any precautions are not clearly understood, or local conditions are not covered, contact the
nearest APC representative or APC at (214) 342-5000 for clarification.
Also, refer to all applicable federal, state, and local regulations, and industry guidelines for
correct installation of this power system.
1.3 Inspection upon Receipt of Goods
1.3.1 General
APC has taken precautions in packing the power equipment for shipment to ensure its safe
arrival; however, the entire shipment including any boxes or crates should be inspected upon
receipt for evidence of damage that may have occurred during transit.
1.3.2 Visible External Damage
It is the responsibility of the person receiving the shipment to inventory and inspect all materials
against the bill of lading or waybill provided IMMEDIATELY
carrier representative is STILL ON SITE
including the correct number of pallets and the quantity of accessory and/or component boxes.
Also, note any visible external damage that may have occurred during transit.
. Please be sure that all items are accounted for,
upon taking delivery while the
If damage has occurred or the quantity of items is not correct, then:
1) Make a descriptive notation on the delivery receipt before signing.
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2) File a damage or shortage report with the carrier that delivered the shipment.
1.3.3 Concealed Damage
It is the customer’s responsibility to unpack the power system and equipment received from
APC and check for concealed damage. Within 15 days of receipt, check the materials received
against the detailed packing list to verify that the quantity and condition are complete and
satisfactory.
Again, note any damage to the internal packing material and/or material shortages. If damage or
shortage is noted, then:
1) Request an inspection by the carrier;
2) File a concealed damage claim; and/or
3) File a material shortage claim with your APC representative.
DELAY IN NOTIFYING THE CARRIER MAY RESULT IN LOSS OF RIGHT TO
REIMBURSEMENT FOR DAMAGES OR LOSS.
If you are unsure about the appearance of a part while conducting the materials inventory and
inspection, refer to the manual or contact the Customer Service Department of APC
Should you have any questions concerning potential damages or should you experience a
lack of cooperation from your carrier, please contact your APC representative, or call
APC
1.3.4 Return of Damaged Goods
Should equipment be damaged and require return to APC for repair, the APC service
representative will provide instructions along with a valid returned material authorization
(RMA) number to facilitate return of the damaged goods to the APC repair center.
It is important that the steps outlined in Section 1.3.2 and Section 1.3.3 above are followed
carefully. Your APC representative will assist you, if required, in obtaining proper disposition
of an initial delivery return issue; however, a valid RMA number must be obtained before
returning any equipment to APC.
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2. CUSTOMER SERVICE AND SUPPORT
APC manufactures a line power plants and provides customers with complete product and
systems support and service. APC has an international network of factory trained service
technicians. The service organization is on call 24 hours a day, 365 days a year.
If there is a problem with the power system, contact APC at
(800) 800-4APC
Units returned for repair can be turned around within 24 to 48 hours of receipt at the
factory location. Shipment should be sent pre-paid. The unit will be returned pre-paid
provided it was received that way.
An RMA must be obtained for all equipment returned to APC. It is important that correct
procedures be followed in filing an RMA, including providing an accurate written description of
the problem. An accurate written problem description will help ensure that the unit will be
properly repaired.
If a unit is returned and a “No Fault Found” results, APC reserves the right to bill the customer
for labor and assess a service charge to cover extra costs incurred.
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3. WARRANTY PROVISIONS
3.1 General Provisions
APC warrants the power equipment and components it manufactures or sells against defective
materials and workmanship for a period of TWO (2) YEARS from the date of shipment.
3.1.1 Warranty Returns
If initial physical inspection results in identification of a material or workmanship flaw(s) that
could impair product performance as defined by APC’s electrical and physical specification in
effect at the time of shipment, and if this flaw(s) is not due to transportation damage or
installation abuse, contact APC or call the 24-hour emergency number, (800) 800-4APC, to
request assistance.
You will be provided either a) an RMA number with instructions for return of the equipment or
component(s) to the APC factory service center, FOB destination, freight pre-paid, for
examination, or b) for non-returnable systems and equipment, notice to wait until an APC
authorized service representative arrives at the site to inspect the equipment. Repaired or
advance replacement modules or circuit components will normally be available within 24 to 48
hours of receipt of equipment or RMA.
3.1.2 Warranty Repair or Replacement
If, during the warranty period, the supplied equipment is found to be physically or electrically
faulty due to defective materials or workmanship on the part of APC, the defective product(s) or
component(s) will be repaired or replaced at the sole option of APC without charge to the user
for replacement materials or repair labor. (The procedure outlined above for contacting APC
must be followed.) Costs incurred for replacement installation including, but not limited to,
installation equipment, travel expenses of an APC representative(s), and costs of installation
material transportation expenses are not the responsibility of APC Any replacement product(s)
or component(s) shall only complete the remaining unused portion of the original warranty of
the replaced product(s) or component(s).
3.2 Exclusions and Limitations
1. This warranty applies only to the original US domestic purchaser (user) and is not
transferable internationally, except with expressed written consent from APC facility in
Dallas, Texas.
2. APC reserves the right to void the warranty if identification marks or serial numbers have
been removed or tampered with, or the defect is determined to have been caused by misuse,
neglect, improper installation, environmental conditions, non-authorized repair, alteration, or
accident.
3. This warranty does not cover physical damage due to the acts of nature or man that stress the
equipment or component(s) beyond design limits and exert undesirable influence aside from
normal wear and tear.
4. APC assumes no responsibility for any work accomplished or expenses incurred except with
expressed written consent from APC
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5. APC shall not be liable to the user (purchaser) or any third party for indirect, incidental, or
consequential damages such as, but not limited to, loss of use, loss of profits, costs
associated with removal/installation of a defective product(s) or component(s) arising out of
the sale or relating to the use of this product, and the user (purchaser) assumes responsibility
for all personal injury and property damage resulting from the handling, possession, or use
of the product. In no event shall the liability of APC for any and all claims, including claims
of breach of warranty or negligence, exceed the purchase price of the product that gave rise
to the claim.
The above warranty is in lieu of all other remedies, including actions for contract or negligence.
All other warranties, expressed or implied, including but not limited to the implied
warranties of merchantability and fitness for a particular purpose, are hereby excluded.
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4. PRODUCT OVERVIEW AND TECHNICAL DESCRIPTION
4.1 Description
The APC Models MX28B-1200/2400 represents a family of stand-alone -48V dc power plants.
Through the use of modular power and distribution box frames, a system is configurable in such
a manner that it will support most typical applications within the specified current range of up to
3600 amps without special application engineering or assistance.
The system is designed to start as a base unit capable of supplying 1200 amps of –48V dc power
in a single box frame with integrated power distribution breakers and an advanced control and
monitoring module. Standard distribution for a power bay includes up to 48 plug-in circuit
breakers (1 to 100 amps), or large panel-mounted circuit breakers (250 to 700 amps).
Expansion of the base unit is accomplished by adding power frames and distribution frames on
either side of the base unit The distribution box frames come with a variety of circuit breaker
and fuse options. Power expansion of the 1200 amp plant to a 2400 amp plant only requires the
addition of splice plates to the existing bus structure.
An optional low voltage disconnect (LVD) can be provided on either the battery or the load side
in each power bay. Systems incorporating power distribution frames need an external LVD unit
A 1200 amp MX28B is shown in. Figure 4-1. A block diagram is shown in Figure 4–2.
Figure 4-1 MX28B-1200
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Figure 4-2 MX28B-1200 System Diagram
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4.2 Power Output Capacity
A single power box frame consists of six rectifier shelves, each shelf accommodating up to four
hot-plug, 50 amp rectifiers. A completely configured power frame with 24 rectifiers is rated at
1200 amps. Each additional power frame will add up to 1200 amps for a maximum total of
2400 amps using 48 rectifiers. A single master control unit in the first power frame provides
control and monitoring for the entire system.
4.3 Rectifiers
The rectifiers are APC Model MRF28H54BV with specifications as follows:
•= Input Voltage: 176-264V ac (230V ac nominal) @ 45-66 Hz
•= Input Current per Rectifier: 13.9 Amps @ 230V ac
•= Apparent Power Factor: 99% Typical, 98% Minimum
•= Output Voltage: 54.5V dc
•= Overvoltage Protection: Set at 59.5V dc
•= Output Current per Rectifier: 50 Amps Minimum Continuous
•= Power Output per Rectifier: 2800W Continuous, Vin > 198V ac
•= Efficiency: 91% Typical
•= Cooling: Fan cooled, front to rear airflow
•= Ambient Temperature: -25°C to 65°C Operational
4.4 Control Unit
The microprocessor-based power system control unit is 1U high (1.75”) and provides control
and monitoring functions. Features implemented are:
•= 32-character alphanumeric display (2 lines by 16 characters)
•= LED alarm and status indicators
•= Standard voltage and battery charging control
•= Battery temperature compensation (optional temperature probe)
•= Monitoring of up to 18 shelves of four rectifiers each
•= Individual alarm monitoring of 72 breakers
•= Individual alarm monitoring of ten power distribution fuses
•= Eight alarm / annunciation relays (Major, Minor, and six user defined) with form C
contact outputs
•= Four external alarm inputs (either N.O. or N.C. contacts)
•= Control for two independent Low Voltage Disconnects (LVD’s)
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+
)
4.5 AC Input Power
Each rectifier requires 208/220/240V ac, singlephase, 50/60 Hz, supplied through an external 20amp two-pole breaker. A vertical wire channel at
the rear of the box frame provides terminal strips
for ac input power connection of each shelf.
Separate “Earth Ground” terminal bars are
provided for the connection of the safety ground
wires. A power entry box is provided at the top
and rear of the box frame where AC wiring
conduit can be attached. Refer to Figure 4-3.
4.6 Battery connections
-
Battery connections are made at the top rear of the
unit. The -48V and Battery Return buses each
provide four sets of threaded 3/8”-16 holes on 1
inch or 1 ¾ inch centers for connecting two-hole
battery cable lugs. Refer to Figure 4-3.
A battery disconnect breaker is required external
to this equipment. The power plant can monitor
auxiliary contacts from this breaker. Battery
temperature compensation is available. APC’s
master control unit, in conjunction with the
optional temperature monitor sensor cable, is used
to implement this function.
4.7 DC Distribution
A standard power distribution module within the power
box frame contains two 24-position plug-in circuit
breaker columns, providing -48V power for customer
loads. Each breaker column is connected at its center to
the -48V dc bus, with each side having an ampacity of
300A. Connections for the -48V dc loads are located
directly to the side of the corresponding breaker. A
typical load connection would utilize a #6 AWG wire
with a two-hole lug on 5/8-inch centers, attached with
standard #10-32 mounting screws.
Battery
Connections
AC entry and
vertical wiring
channel
Figure 4-3 Power Entry Box and Battery
Connections
Circuit Breaker Positions (-
The load return cables for each circuit breaker section
connect to a return bus directly opposite the circuit
breakers. These return buses contain patterns for 28
two-hole #10-32 lugs on 5/8-inch centers, and 14 twohole ¼”-20 lugs on a double-pattern of either 5/8-inch
or 1-inch centers. Figure 4-4 shows the power plant’s dc
Load Returns (+) and
Facility Main Ground Bus
Figure 4-4 DC Distribution
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distribution section with the front cover removed.
Alternate circuit breaker configurations are available in order for the power frames to provide
support for larger individual load connections. Six circuit breakers in the 100 amp to 400 amp
range or four circuit breakers in the 225 to 700 amp range in a panel-mount arrangement can be
specified instead of the distribution module with 48 plug-in breakers.
Optional power distribution box frames can be added to a power system to support additional
circuit breakers or telecom fuses. Auxiliary alarm contacts from circuit breakers can be brought
back to the control unit through the use of an alarm extension printed circuit board in each bay.
Ten fuses outputs can also be directly monitored by the control unit.
4.8 Environmental
•= Ambient Temperature: -20°C to +65°C operating
-40°C to +85°C storage
•= Humidity: 0% to 85% RH non-condensing operating
0% to 95% RH non-condensing storage
•= Altitude: Up to 3000m, operating
Up to 10,000m, storage
4.9 Mechanical
•= Weight: Base Power Frame – 400 to 600 lbs. (181 to 272 kg)
•= Dimensions Box Frame: 84” high x 26” wide x 26” deep
•= Color: Dawn Gray (fronts)
4.10 Compliance
•= Safety UL 1950
Extension Power Frame – 400 to 600 lbs. (181 to 272 kg)
Rectifier - 11 lbs. (5 kg.)
(2134 mm x 660 mm x 660 mm)
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5. INSTALLATION PROCEDURES
5.1 Preparation
5.1.1 Recommended Tools
•= Standard selection of insulated hand tools.
•= Proper tools for crimping the selected cable lugs.
5.1.2 Recommended Test Equipment
•= Digital Multimeter
5.1.3 Equipment Inspection
Remove equipment from packing material and inspect for shipping damage to verify the safety
and operational suitability for the installation site. [Refer to Section 1.3]
5.1.4 Safety Precautions
***** WARNING *****
The MX28B dc power plant is supplied from a nominal 220V ac, 60 Hz source. Keep the ac
input enclosure cover in place when the system is operational or energized.
***** CAUTION *****
Handling or touching the controller boards located inside this unit without being electro
statically discharged (grounded to the frame) may cause extensive damage to the electronics.
Before touching or handling the controller boards, it is recommended that an ESD wrist
strap be utilized.
***** WARNING *****
Hazardous energy levels are present on bare conductors in the -48V dc 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:
•= Any jewelry, rings or watches be removed while working on this equipment.
•= Handles of all wrenches, screwdrivers, cutters and pliers be insulated.
•= Shafts of screwdrivers be wrapped in electrical tape or otherwise insulated.
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5.1.5 Room/Locations
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 for all other equipment
that may reside in the power room area.
5.1.6 Mounting
The box frame housing the MX28B components is self-supporting, but designed to be bolted to
the floor of the housing structure. Figure 5-1 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.
FRONT
23.00
1.50
Figure 5-1 Floor Mounting Dimensions
11.50
11.50
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.
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5.1.7 Ventilation
The rectifiers 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 4.8 for environmental characteristics.]
5.2 AC Service and Ground Connections
*****
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.
The MX28B dc power plant requires the
supply of 208/220/240V ac, singlephase, 50/60 Hz power through
individual external 20-amp two-pole
circuit breakers to the ac input terminal
block connections for each rectifier in
the system. The ac wiring, from the ac
input terminal block connections to the
hot-pluggable ac input connector for
each rectifier, is factory installed.
AC Input
Enclosure
Access
Opening
The ac input enclosure, located at the top
rear of the MX28B housing, is provided
with nine ¼ -inch conduit pilot holes in
the top plate (Figure 5-2). Remove the
ac input enclosure from the box frame in
Vertical channel
for AC wiring
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
Figure 5-2 AC Wiring Access
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” for connection of the two ac
wires (Figure 5-3). 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 view from the front.
The suggested wire size is #10 AWG rated at 90°C or higher;
however, the ambient temperature and number of wires in a
Figure 5-3 AC
Terminal Block
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MX28B-1200 PRODUCT MANUAL Revision B
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.
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.
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5.3 Battery Connections
5.3.1 Battery Disconnect
An external circuit breaker (not supplied) is required 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. Selection of a circuit breaker for a battery string
should take into account maximum battery short circuit current and cable sizing.
5.3.2 Cable Sizing Considerations
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.
5.3.3 Connecting the Cables
The battery cable connections are located at the
top rear of the unit as shown in Figure 5-4.
The battery positive (return bus) and battery
negative (-48V bus) buses each provide four
sets of 3/8”-16 holes on a double pattern oneinch and 1 ¾-inch centers for connecting twohole 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.
Battery Positive (+)
-
Battery Negative (-)
Figure 5-4 Battery Connections
***** CAUTION *****
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.
5.4 DC SYSTEM GROUNDING
THE POSITIVE LOAD CONNECTION (RETURN BUS) FOR THE POWER PLANT
MUST BE CONNECTED TO THE FACILITY MASTER STATION GROUND. THE
CONNECTION SHOULD BE MADE ON THE RETURN BUS IN THE BASE UNIT
DISTRIBUTION AREA. DETAILS FOR THIS CONNECTION SHOULD BE
PROVIDED IN THE SITE ELECTRICAL GROUNDING PLANS.
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5.5 Rectifier Installation
The APC Model MRF28H54BV rectifiers are shipped in separate containers. Follow the
procedure below to install a rectifier.
1) Remove the rectifier from its shipping container.
2) Remove the rectifier retaining screw from the shelf position where the rectifier is to be
installed.
3) Slide the rectifier into the shelf between the guides until it is fully seated.
4) Fasten the rectifier in place with the rectifier retaining screw.
Since all adjustments are made from the system control unit, no rectifier adjustments are
necessary.
NOTE: All “FLOAT” – “BOOST/EQUALISE” switches (one is located on the front of
each rectifier in the system) must be set to “FLOAT” to allow the MX28B to
control the output voltage properly.
5.6 Multiple Frame Assembly
5.6.1 Power Bus Connections
Installations with multiple box frames requires splicing of the power buses. The MX28B-1200 /
2400 family of power systems and distribution bays are designed so that the power buses can be
connected from bay to bay through the use of simple splice plates. Figure 5-5 shows the
connection between two box frames for the normal 2500 amp bus work.
Splice Plates
Figure 5-5 Multi-Bay Splice Plates
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5.6.2 Control Wiring
Cables for controlling and monitoring the rectifiers and circuit breakers/fuses must be run from
expansion frames to the control unit in the base frame. There are three basic cables used for
these functions:
•= The AWA-0970 ten-pin ribbon cable connector handles serial communications for rectifier
reporting and control. This cable connects to the J1 connector of the DC/DC converter
PCB’s (EAA-0111) in each power box frame.
•= Circuit breaker reporting in extension power and distribution bays is communicated back to
the control unit through the AWA-0972 cable. This cable is connected to J15 on the control
unit interface PCB in the base unit and runs to connector J2 on the Alarm Extension PCB
(EAA-0072) in the remote bay. Additional bays are connected via the same cable, which
connects up to four Alarm Extension PCB’s.
•= Fuse reporting is routed from the Fuse Sense PCB (ADV-1204) to the control unit via cable
AWA-0967.
Refer to Figure 5-6 for a pictorial representation of multi-bay cable connection. Figure 5-7
shows the information as a wiring diagram.
MX28B-1200/2400 19
MX28B-1200 PRODUCT MANUAL Revision B
EXTENSION
DC/DC CONVERTER
POWER
BAY
AWA-0970
DC/DC CONVERTER
AWA-0969
AWA-0967
BASE
POWER
BAY
AWA-0972
CONTROL UNIT
FUSE BAY
FUSE SENSE PCB
Figure 5-6 Typical Connection of Cables in Multi-Bay System
20 MX28B-1200/2400
MX28B-1200/2400 21
Figure 5-7 Multi-Bay Wiring Diagram
Revision B MX28B-1200 PRODUCT MANUAL
22 MX28B-1200/2400
MX28B-1200 PRODUCT MANUAL Revision B
Revision B MX28B-1200 PRODUCT MANUAL
5.7 Alarm Connections
The alarm connections for all rectifiers, breakers, and fuses are factory pre-wired. The MX28B
dc power plant, however, permits the user to program the system alarms in various ways. A
Printed Circuit (PC) board designated “EAA-0075” is mounted in the space above the master
control unit and provides terminal block connection points for alarm outputs and alarm inputs
(Figure 5-8). These cage-clamp terminal blocks are operated by pushing back the lever,
inserting the wire and then releasing the lever to clinch the connection. Recommended wire size
is #28 AWG to #20 AWG.
Alarm Outputs Alarm Inputs
Figure 5-8 Alarm Interface PC Board
MX28B-1200/2400 23
MX28B-1200 PRODUCT MANUAL Revision B
5.7.1 External Alarm Inputs
Four external alarm inputs with assignable priority levels are available. These alarm inputs
respond to external dry contact closures between normally open (NO) and common (C) or
contact openings between normally closed (NC) and C (see Table 5-1).
External Alarm Source
(non-alarm state)
OPEN
CLOSED
Table 5-1. External Alarm Input Definition
Table 5-2 shows the external alarm input connection designations. Connector J4 is located on
the alarm interface board mounted in the space above the control unit. Systems are shipped with
jumper wires connecting each NC and corresponding C contact. A jumper wire should be
removed only if the corresponding NC-C contacts are going to be used.
EXTERNAL
ALARM
INPUT
#1
#2
#3
#4
Table 5-2. External Alarm Input Connections
J4 TERMINAL
DESIGNATION
(NO-NC-C)
NO1-NC1-C1
NO2-NC2-C2
NO3-NC3-C3
NO4-NC4-C4
Connect To Input
Alarm Terminals
NO-C
NC-C
USER ALARM NOTES
___________________________
___________________________
___________________________
___________________________
5.7.2 Alarm Outputs
There are eight alarms available that provide outputs via Form “C” relay contacts. The last two
of these are pre-assigned as the Minor and Major alarm outputs. The Major relay is energized
(NO-C contacts closed) during normal (non-alarm) operating conditions; all the other relays
energize when an alarm condition occurs. The other six outputs are initially designated as
“Relay 1” through “Relay 6” (the user may assign more meaningful names if desired). The
various system alarm conditions can be assigned to any of the eight alarm outputs.
Table 5-3 shows the alarm output connection designations. Connectors J1 and J2 are located on
the alarm interface board mounted in the space above the control unit. The relay contacts should
only be used to switch resistive loads of 0.5 amperes or less at 60 volts or less.
24 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
ALARM
OUTPUT
RELAY #1
RELAY #2
RELAY #3
RELAY #4
RELAY #5
RELAY #6
MINOR
MAJOR
Table 5-3. Alarm Output Connections
5.8 Connecting The Loads
5.8.1 DC Circuit Breakers and Fuses
Both plug-in circuit breakers and Telecom fuses can be installed in the MX28B power plant for
dc distribution circuit protection. Available plug-in circuit breakers are shown in Table 5-4.
Plug-in circuit breakers rated at 60A or more require two mounting positions and require a
breaker adapter kit, which is included (see kit selection information below the table). The
breaker adapter kit includes all necessary mounting hardware.
TERMINAL
DESIGNATION
NO-NC-C
J1
NO1-NC1-C1
NO2-NC2-C2
NO3-NC3-C3
NO4-NC4-C4
J2
NO5-NC5-C5
NO6-NC6-C6
NO7-NC7-C7
NO8-NC8-C8
USER ALARM NOTES
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
BREAKER
RATING
1 A FFA-0014 40 A FFA-0020
3 A FFA-0015 50 A FFA-0025
5 A FFA-0016 60 A FFA-0021-X *
10 A FFA-0017 70 A FFA-0022-X *
15 A FFA-0028 80 A FFA-0023-X *
20 A FFA-0018 100 A FFA-0024-X *
30 A FFA-0019
* -1: adapter has #10 studs on 5/8” centers for two-hole cable lug
-2: adapter has #10 studs on ¾” centers for two-hole cable lug
-3: adapter has ¼” studs on 1” centers for two-hole cable lug
PART NUMBER BREAKER
RATING
Table 5-4. Plug-in Circuit Breakers
PART NUMBER
MX28B-1200/2400 25
MX28B-1200 PRODUCT MANUAL Revision B
Fuse holders that accommodate telecom fuses are located in a separate fuse power distribution
box frame. The fuse holders are designed to hold Bussmann® (or equivalent) TPL-series fuses
in sizes of 70 amps to 600 amps. The following stock sizes are available from APC:
FUSE
RATING
200 A FFA-0106
300 A FFA-0093
600 A FFA-0099
Table 5-5 Telecom Power Fuses
5.8.2 Installation of Circuit Breakers and Fuses
5.8.2.1 Plug-in Circuit Breakers
1) Remove the circuit breaker cover panel and the plastic cover(s) from the desired
location(s).
2) Install the circuit breaker(s) by snapping the top terminal onto the upper bus bar and
rotating the unit down until the second terminal snaps onto the breaker termination post
as shown in Figure 5-9. The breaker alarm terminals are designed to make contact with
the alarm terminal board as the breaker is snapped into place.
NOTE: Circuit breaker alarm contacts close when the circuit breaker is tripped but
not when it is turned OFF.
APC PART
NUMBER
***** CAUTION *****
During circuit breaker installation, carefully align the breaker alarm terminals with the alarm
terminal board to avoid breaker terminal damage.
3) Reattach the circuit breaker cover panel.
26 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
Figure 5-9 Plug-in Circuit Breaker Insertion
5.8.2.2 Circuit Breaker Load Connections
Connections for the -48V dc loads are located directly to the side of the corresponding breaker.
A typical load connection would utilize a #6 AWG wire with a two-hole lug on 5/8-inch centers,
attached with standard #10-32 mounting screws.
The load return cables for each circuit breaker section connect to a return bus directly opposite
the circuit breakers. These return buses contain patterns for 28 two-hole #10-32 lugs on 5/8inch centers, and 14 two-hole ¼”-20 lugs on a double-pattern of either 5/8-inch or 1-inch
centers.
5.8.2.3 Power Distribution Fuse Load Connections
Connection for the –48V dc loads are made to L-shaped
landing pads connected to the distribution side of the
fuse. All the fuses within a given box frame have a
common bus connection to –48V dc. Load side
connections utilize a double-hole lug on 1 ¾ -inch
centers and return connections are made to the common
Fuse Connections
return bus bar at the top of the cabinet using 1-inch or 1
¾ -inch lugs (Figure 5-10).
Figure 5-10 Fuse Bay Connections
MX28B-1200/2400 27
MX28B-1200 PRODUCT MANUAL Revision B
5.9 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.
1) Plug the connector end of the temperature probe into J5 the control unit interface card in
the base power bay.
2) Route the cable as required to position the probe on the selected battery cell
3) Remove the adhesive protection strip from the probe body and press the adhesive side of
the probe on the battery cell cover.
BATTERY
TEMPERATURE
PROBE CABLE
15 ft. (4.6m) FFA-0013-1
50 ft. (15.2m) FFA-0013-2
Table 5-6 Temperature Probe Cables
5.10 Power-Up and Checkout
Before initiating power-up and checkout, ensure that the following conditions exist:
1) Make sure that the external circuit breaker protecting the cables from the battery to the
power plant is turned OFF (the battery cables should be connected to the power plant, but
the battery should not
2) Make sure that all load circuit breakers are turned OFF and all load distribution fuses are
removed.
3) Verify that all rectifiers have been installed.
5.10.1 Apply AC Power
be connected).
APC PART
NUMBER
Turn on the circuit breakers that supply ac power to the rectifiers in the MX28B dc power plant.
The main screen should appear on the control unit display (see Figure 5-11). The display on the
control unit is a 2-lines by 16-characters display. The cursor cycles below the characters of the
active selection on the display. Information shown in the second line of Figure 5-11 that extends
beyond 16 characters (to the right of the “S” in “ALARMS”) can viewed on the control unit
display by using the scrolling controls (refer to Section 6 for operation of the control unit).
NOTE: When ac power is initially applied, there is a 60-second period during which no
alarms are reported.
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MX28B-1200 +
STATUS ALARMS SYSTEM MODULES BATT PIN OEM
Figure 5-11 Control Unit Display
5.10.2 System Parameters Verification/Adjustment
The MX28B system control unit is delivered with pre-programmed parameter default settings.
A complete listing and description of all system configuration parameters as well as displayable
system status and information is provided in Section 6. Read Section 6 to gain an understanding
of and how to use the operational features provided by the MX28B dc power plant. As a
minimum, the following parameters should be verified and adjusted, if required, before
connecting batteries or loads to the power plant:
1) Battery Float Voltage - default = -54.00V dc (Check the manufacturer’s
recommendation for the batteries being used in the system.)
2) Battery Maximum Recharge Rate - default = 50A. (Bellcore specifications
recommend a maximum charging rate of battery capacity (in Ampere-hours) divided by
20 hours; check the manufacturer’s recommendation.)
3) System Voltage - measurement ≅ -54.00V dc (This is a measurement by the system of
the dc output bus voltage.)
4) LVD Option - default = “Enable” (If the MX28B does not have an LVD installed, this
should be changed to “Disable”.)
5) Rectifier Information - Check the rectifier information displays to verify that all
rectifiers installed can be viewed on the control unit display and that no rectifier alarms
are active.
Section 6 provides location information for these parameters and how to make changes if
required.
5.10.3 Full System Power Up
To complete a full system power up, perform the following steps
1) Turn OFF all the circuit breakers that supply ac power to the rectifiers in the MX28B dc
power plant.
2) Turn on the external circuit breaker from the battery to the power plant.
3) Turn on all the circuit breakers that supply ac power to the rectifiers in the MX28B dc
power plant.
4) Load circuit breakers and distribution fusses may now be turned on and inserted as
required.
MX28B-1200/2400 29
Revision B MX28B-1200 PRODUCT MANUAL
6. SETUP, ADJUSTMENTS, AND OPERATION
6.1 User Interface
The MX28B control unit provides a user interface designed with a hierarchical menu that can be
viewed on the 32-character display by “navigating” with the “ ” (left), “ ” (right), “ ” (up),
and “ ” (down) arrow keys located on the front panel. The selected item on the display is
identified by the cursor cycling beneath its characters.
MX28B +
STATUS ALARMS SYSTEM MODULES BATT PIN OEM
Arrow Keys move Display Window across main
menu items and down into additional menu
selections
Figure 6-1 Navigating the Menu
The “M” (Modify) key and the arrow keys are used to set parameters and text to customize the
system operation for a specific application. Items that can be modified have "m+" in the upper
right corner of the display. If a security level higher than the one presently set is required to
modify the parameter, "s+" is displayed instead of “m+”. Status, alarms, and information
screens have "+" in the upper right corner of the display (or “#” in the case of rectifier
information screens) and cannot be modified. When ac power is initially applied, there is a 60second period during which no alarms are reported.
Pressing the "M" key on the front panel will change the "m+" to "M+", indicating that the
parameter can now be changed using the arrow keys. Some parameters can be changed to other
predefined selections by pressing the up or down arrow keys to display an alternative selection.
These parameters can be recognized after the “M” key is pressed by the cursor cycling beneath
the characters of the selection. For other parameters, such as text and most numeric values, after
the “M” key is pressed the cursor will be displayed under an individual character. The right or
left arrow key is used to position the cursor below the character to be changed and the up or
down arrow key is used to "spin" the digit or letter to the desired value. When the desired
changes have been made to an individual parameter screen, the “M” key is pressed again; the
“M+” changes back to “m+” and the new entry is stored in memory.
If the user plans to make any changes to system parameters, the first item that should be verified
or entered is the appropriate password for the security level required for the parameters to be
modified. Security level 2 enables modification of all variable system parameters, level 1
MX28B-1200/2400 31
MX28B-1200 PRODUCT MANUAL Revision B
permits modification of some parameters; no security is required for viewing status items. The
security level password is entered through the “PIN” screen. If no front panel keys are pressed
for 60 minutes, the active password reverts to “0000” and “█APC█” begins to move about the
display. Pressing any key returns the display to normal; the password must be re-entered if
system parameters require changes. The default passwords for level 1 and level 2 are “1111”
and “2222”, respectively. There are no alternate passwords or “backdoors” for accessing the
system. A forgotten password may require a new master controller board, at customer expense.
System control parameters are stored in non-volatile memory and will not be erased when power
is removed for the master control unit. However, if a new program EPROM is installed or a
different device model selected, the system control parameters will be re-initialized to the
factory default settings.
Eleven LEDs are provided on the front panel of the control unit to indicate system status. Three
LEDs grouped together vertically provide overall system status; they are “MAJOR”, “MINOR”,
and “NORMAL”, indicating the presence of a major alarm, a minor alarm, or normal operation.
The other eight LEDs correspond to the active state of each of the alarm output relays and are
labeled “ALM1”∙∙∙“ALM6”, “MIN”, and “MAJ”.
6.2 External Alarm Inputs
The four external alarm inputs (also referred to as “Input Relay Alarms”) can be assigned a
priority and routed or “mapped” to alarm output relays. Available assignments are “Ignore”,
“Major”, “Minor”, and “Relay 1” ∙∙∙ “Relay 6”. Screens for making the assignments are
located at [SYSTEM/IN-RLY/RLY-MAP]. This special menu notation is explained with an
example in section 6.4
A user defined name or “alias” may also be assigned to each of these input alarms. Screens for
making these assignments are located at [SYSTEM/IN-RLY/ALIAS]. For information on
wiring connections to these inputs refer to Section 5.7.1.
6.3 Alarm Output Relays
There are eight alarm output relays designated Relay 1 through Relay 6, Minor, and Major,
respectively. Various system parameters may be programmed to activate any of these alarm
relays when set thresholds are exceeded or specific conditions occur. The first six relays can
also be assigned a priority and routed or “mapped” to other output alarm relays. Available
assignments are “Ignore”, “Major”, “Minor”, and “Relay 1” ∙∙∙ “Relay 6”. Screens for making
these assignments are located at [SYSTEM/OUT-RLY/RLY-MAP]. This feature makes it
possible for a single alarm condition to activate multiple alarm output relays including the Minor
or Major alarm relay. A user defined name or “alias” may also be assigned to each of the eight
output relay alarms. Screens for making these assignments are located at [SYSTEM/OUT-
RLY/ALIAS]. For information on making wiring connections to the alarm output relays refer
to Section 5.7.2.
6.4 Parameter Locations, Descriptions, and Default Values
The location, description, and factory programmed default value for each of the MX28B system
parameters is found in Table 6-1. The table also shows all of the status and information screens
with typical displays. The location of a parameter screen is shown in brackets, for example:
[SYSTEM/IN-RLY/RLY-MAP]. To find the parameters that can be accessed in this category,
starting from the main menu screen, do the following:
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Revision B MX28B-1200 PRODUCT MANUAL
1) Use the right or left arrow keys to position the cycling cursor below “SYSTEM”.
2) Press the down arrow key once.
3) Use the right arrow key to position the cycling cursor below “IN-RLY”.
4) Press the down arrow key once; the cursor will be cycling below “RLY-MAP”.
5) Press the down arrow key (repeatedly if necessary) until the desired parameter screen is
displayed (there are eight parameter screens in this category).
6) After making any desired changes (refer to Section 6.1 for the procedure), to return to the
main menu press the up arrow key repeatedly.
If a parameter requires a level 1 or level 2 security access to permit changes to it, the security
level will be found in braces, i.e. {2}, in the “PARAMETER” column of Table 6-1.
The complete menu structure shown in the order in which it is accessed from the control unit
display is presented in outline form in Figure 6.2. Each indentation to the right represents a
menu level below the indicated title.
MX28B-1200/2400 33
MX28B-1200 PRODUCT MANUAL Revision B
Figure 6-2. Control Unit Menu Structure
MX28B-1200 +
STATUS
Sys Voltage
Sys Current
Sys Temp
Batt Current
Batt Temp
ALARMS
Alarm Item 1
Alarm Item 2
Alarm Item 3
Alarm Item 4
Alarm Item 5
Alarm Item 6
Alarm Item 7
Alarm Item 8
Alarm Item 9
Alarm Item 10
Alarm Item 11
Alarm Item 12
Alarm Item 13
Alarm Item 14
Alarm Item 15
Alarm Item 16
SYSTEM
SET-ALM
Sys HV Thr
Sys HV Alm
Sys LV Thr
Sys LV Alm
Rect Cfg Alm
Rect 1ofN Alm
Rect 2ofN Alm
Sys HT Thr
Sys HT Alm
Sys LT Thr
Sys LT Alm
Hw Sys V Alm
Hw Batt C Alm
Hw Batt T Alm
Hw Sys T Alm
Hw LVD1 Alm
Hw LVD2 Alm
SETUP
PIN 1
PIN 2
Address 1
34 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
(Figure 6-2. Control Unit Menu Structure)
Address 2
Address 3
Model
Fahrenheit
Cntrl Rev
FW Version
Display Type
DATE
Date
Time
OUT-RLY
RLY-MAP
Out-Rly 1 Alm
Out-Rly 2 Alm
Out-Rly 3 Alm
Out-Rly 4 Alm
Out-Rly 5 Alm
Out-Rly 6 Alm
Out-Rly 1 Dly
Out-Rly 2 Dly
Out-Rly 3 Dly
Out-Rly 4 Dly
Out-Rly 5 Dly
Out-Rly 6 Dly
ALIAS
Out-Rly 1
Out-Rly 2
Out-Rly 3
Out-Rly 4
Out-Rly 5
Out-Rly 6
Relay Minor
Relay Major
IN-RLY
RLY-MAP
In-Rly 1 Alm
In-Rly 2 Alm
In-Rly 3 Alm
In-Rly 4 Alm
ALIAS
In-Rly 1
In-Rly 2
In-Rly 3
In-Rly 4
DIAG
Store Cfg
Lamp Test
MX28B-1200/2400 35
MX28B-1200 PRODUCT MANUAL Revision B
(Figure 6-2. Control Unit Menu Structure)
Test Relay En
Test Relay 1
Test Relay 2
Test Relay 3
Test Relay 4
Test Relay 5
Test Relay 6
Test Min Rly
Test Maj Rly
MODULES
RECT
SET-ALM
Rect CL Alm
Rect Stdby Alm
Rect FF Alm
Rect RFA Alm
PARAM
Rect Fail Safe
Rect Fail Comm
INFO
Rect # Desc
Rect # Curr
Rect # CL
Rect # Stdby
Rect # FF
Rect # RFA
CIRBKR
SET-ALM
Cir Bkr 1 Alm
Cir Bkr 2 Alm
Cir Bkr 3 Alm
Cir Bkr 4 Alm
Cir Bkr 5 Alm
Cir Bkr 6 Alm
••••
••••
••••
Cir Bkr 70 Alm
Cir Bkr 71 Alm
Cir Bkr 72 Alm
ALIAS
Cir Bkr 1
Cir Bkr 2
Cir Bkr 3
Cir Bkr 4
Cir Bkr 5
Cir Bkr 6
36 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
(Figure 6-2. Control Unit Menu Structure)
Cir Bkr 7
Cir Bkr 8
••••
••••
••••
Cir Bkr 70
Cir Bkr 71
Cir Bkr 72
FUSE
SET-ALM
FUSE 1 Alm
FUSE 2 Alm
FUSE 3 Alm
FUSE 4 Alm
FUSE 5 Alm
FUSE 6 Alm
FUSE 7 Alm
FUSE 8 Alm
FUSE 9 Alm
FUSE 10 Alm
FUSE 11 Alm
FUSE 12 Alm
FUSE 13 Alm
FUSE 14 Alm
FUSE 15 Alm
FUSE 16 Alm
ALIAS
FUSE 1
FUSE 2
FUSE 3
FUSE 4
FUSE 5
FUSE 6
FUSE 7
FUSE 8
FUSE 9
FUSE 10
FUSE 11
FUSE 12
FUSE 13
FUSE 14
FUSE 15
FUSE 16
MX28B-1200/2400 37
MX28B-1200 PRODUCT MANUAL Revision B
(Figure 6-2. Control Unit Menu Structure)
LVD
SET-ALM
LVD1 Option
LVD1 Open Alm
LVD2 Option
LVD2 Open Alm
PARAM
LVD1 Trip
LVD1 Reset
LVD2 Trip
LVD2 Reset
BATT
SET-ALM
Batt Disc Thr
Batt Disc Alm
Batt HV Thr
Batt HV Alm
Batt LV Thr
Batt LV Alm
Batt HT Thr
Batt HT Alm
Batt LT Thr
Batt LT Alm
PARAM
Batt Float
Batt Max Rech
COMP
Comp Method
Comp TC
Comp HKnee
Comp LKnee
PIN
PIN
OEM
OEM R Offset
OEM R Gain
OEM S Offset
OEM S Gain
38 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
Table 6-1. Parameter Locations, Descriptions, and Default Values
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
SYSTEM SETUP
Password Entry
PIN Entry
[PIN]
Password Setup
Level 1 PIN {2}
[SYSTEM/SETUP]
Level 2 Password {2}
[SYSTEM/SETUP]
OEM Calibration
OEM R Offset {2}
[OEM]
OEM R Gain {2}
[OEM]
OEM S Offset {2}
[OEM]
OEM S Gain {2}
[OEM]
Site Address/Identification
Screen for entry of the active password (PIN).
Password (PIN) that permits security Level 1 parameter
changes - limited access.
Password (PIN) that permits security Level 2 parameter
changes - unlimited access.
Voltage offset adjustment for factory calibration of voltage
readings/settings.
Voltage gain adjustment for factory calibration of voltage
readings/settings.
Current offset adjustment for factory calibration of battery
current readings/settings.
Current gain adjustment for factory calibration of battery
current readings/settings.
PIN m+
0000
PIN 1 m+
1111
PIN 2 m+
2222
OEM R Offset m+
0.000 V
OEM R Gain m+
1.000 V
OEM S Offset m+
0.0 A
OEM S Gain m+
1.000 A
Address 1 {1}
[SYSTEM/SETUP]
Address 2 {1}
[SYSTEM/SETUP]
Address 3 {1}
[SYSTEM/SETUP]
Control Unit Setup & Info.
Model Type {2}
[SYSTEM/SETUP]
Temperature Scale {1}
[SYSTEM/SETUP]
Control Unit Revision
[SYSTEM/SETUP]
Firmware Version
[SYSTEM/SETUP]
Power plant address or identification - first line.
Power plant address or identification - second line.
Power plant address or identification - third line.
Model type number for the MX28B dc power plant
NOTE: Changing the model number causes the system to
reinitialize.
Enables selection of Fahrenheit or Celsius temperature scale
(Fahrenheit “OFF” displays readings in °C).
Hardware revision level of the control unit.
Version number of the control unit firmware.
NOTE: Actual firmware version number displayed is the
current version as of the date of manufacture.
Address 1 m+
APC
Address 2 m+
11035 Switzer Av
Address 3 m+
Dallas, TX.
Model m+
0001
Fahrenheit m+
OFF
Cntrl Rev +
000002
FW Version +
000131
MX28B-1200/2400 39
MX28B-1200 PRODUCT MANUAL Revision B
(Table 6.1 Parameter Locations, Descriptions, and Default Values)
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
Display Type
[SYSTEM/SETUP]
Type number for the control unit display.
Display Type +
000255
Date/Time Setup
Date {1}
[SYSTEM/DATE]
Time {1}
[SYSTEM/DATE]
Alarm Threshold Setup
High Voltage Threshold {1}
[SYSTEM/SET-ALM]
Low Voltage Threshold {1}
[SYSTEM/SET-ALM]
High Temperature Threshold {1}
[SYSTEM/SET-ALM]
Low Temperature Threshold {1}
[SYSTEM/SET-ALM]
System Status
System Voltage
[STATUS]
System Current
[STATUS]
Internal system calendar date.
Internal system clock time (24-hour format).
System High voltage alarm threshold.
System Low voltage alarm threshold.
Over temperature alarm threshold.
Under temperature alarm threshold.
System output voltage measured between the MX28B dc
power plant -48V and return buses.
The total system output current (calculated as the sum of the
individual rectifier output currents).
Date m+
DEC 16 1999
Time m+
9:00:25
Sys HV Thr m+
-58.00 V
Sys LV Thr m+
-50.00 V
Sys HT Thr m+
70.0 C
Sys LT Thr m+
0.0 C
Sys Voltage +
-54.00 V
Sys Current +
145.8 A
System Temperature
[STATUS]
Battery Current
[STATUS]
Battery Temperature
[STATUS]
System Alarms
System High Voltage {1}
[SYSTEM/SET-ALM]
System Low Voltage {1}
[SYSTEM/SET-ALM]
System High Temperature {1}
[SYSTEM/SET-ALM]
System temperature measured within the control unit.
Battery current measured at the current shunt.
Battery temperature measured by the optional battery
temperature sensor probe.
System voltage is above the high voltage threshold.
System voltage is below the low-voltage threshold.
The control unit temperature is above the high temperature
threshold.
Sys Temp +
26.7 C
Batt Current +
-15.0 A
Batt Temp +
25.2 C
Sys HV Alm m+
Minor
Sys LV Alm m+
Minor
Sys HT Alm m+
Minor
40 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
(Table 6-1. Parameter Locations, Descriptions, and Default Values)
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
System Low Temperature {1}
[SYSTEM/SET-ALM]
The control unit temperature is below the low temperature
threshold.
Sys LT Alm m+
Minor
Rectifier Configuration {1}
[SYSTEM/SET-ALM]
Rectifier Fail 1-of-N {1}
[SYSTEM/SET-ALM]
Rectifier Fail 2-of-N {1}
[SYSTEM/SET-ALM]
Hardware System Voltage {2}
[SYSTEM/SET-ALM]
Hardware Battery Current {2}
[SYSTEM/SET-ALM]
Hardware Battery Temperature {2}
[SYSTEM/SET-ALM]
Hardware System Temperature {2}
[SYSTEM/SET-ALM]
Hardware LVD1 {2}
[SYSTEM/SET-ALM]
Hardware LVD2 {2}
[SYSTEM/SET-ALM]
The rectifier configuration differs from its stored
configuration.
Rectifier Fail 1-of-N alarm - one rectifier has at least one
alarm condition.
Rectifier Fail 2-of-N alarm – two or more rectifiers have at
least one alarm condition each.
This alarm indicates there is a hardware failure in the system
voltage monitoring function.
This alarm indicates there is a hardware failure in the battery
current monitoring function.
This alarm indicates there is a hardware failure in the battery
temperature monitoring function.
This alarm indicates there is a hardware failure in the system
temperature monitoring function.
This alarm indicates there is a conflict between the
commanded and sensed positions of the LVD1.
This alarm indicates there is a conflict between the
commanded and sensed positions of the LVD2.
Rect Cfg Alm m+
Minor
Rect 1ofN Alm m+
Minor
Rect 2ofN Alm m+
Major
Hw Sys V Alm m+
Minor
Hw Batt C Alm m+
Minor
Hw Batt T Alm m+
Minor
Hw Sys T Alm m+
Minor
Hw LVD1 Alm m+
Minor
Hw LVD2 Alm m+
Minor
SYSTEM ALARMS DISPLAY
Alarms Item 1
[ALARMS]
•
•
•
Alarms Item 16
[ALARMS]
SYSTEM DIAGNOSTICS
Store Configuration {1}
[SYSTEM/DIAG]
Lamp Test {1}
[SYSTEM/DIAG]
Test Relay Enable {1}
[SYSTEM/DIAG]
Display of up to 16 active alarms (a typical alarm screen is
shown).
•
•
•
Display of up to 16 active alarms (a typical alarm screen is
shown).
Setting this parameter to “Enable” will cause the current
rectifier configuration to be stored (the display toggles back
to “Disable” after entry).
Setting Lamp Test to “ON” will turn on the “MAJOR”,
“MINOR”, “NORMAL”, “MAJ”, and “MIN” LEDs on the
control unit front panel.
This parameter must be set to “Enable” to permit the eight
output relays to be manually tested; otherwise, the state of the
relays will be per system conditions.
Alarm Item 1 +
Batt LV Alm On m
•
•
•
Alarm Item 16 +
Store Cfg m+
Disable
Lamp Test m+
OFF
Test Relay En m+
Disable
MX28B-1200/2400 41
MX28B-1200 PRODUCT MANUAL Revision B
(Table 6-1. Parameter Locations, Descriptions, and Default Values)
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
Test Relay 1 {1}
[SYSTEM/DIAG]
Setting this parameter to “ON” energizes Relay 1 and turns
on the “ALM1” LED on the control unit front panel.
Test Relay 1 m+
OFF
•
•
•
Test Relay 6 {1}
[SYSTEM/DIAG]
Test Minor Relay {1}
[SYSTEM/DIAG]
Test Major Relay {1}
[SYSTEM/DIAG]
BATTERY SETUP
Float Voltage {1}
[BATT/PARAM]
Maximum Recharge Current {1}
[BATT/PARAM]
Compensation Method {1}
[BATT/COMP]
Temperature Compensation {1}
[BATT/COMP]
•
•
•
Setting this parameter to “ON” energizes Relay 6 and turns
on the “ALM6” LED on the control unit front panel.
Setting this parameter to “ON” energizes the Minor Relay
and turns on the “MIN” LED on the control unit front panel.
Setting this parameter to “ON” de-energizes the Major Relay
and turns on the “MAJ” LED on the control unit front panel.
Float voltage at 25°C battery temperature.
Maximum battery recharge current (the system limits the
charging current to this programmable value).
Activate “000001” or de-activate “000000” battery
temperature compensation.
Temperature compensation between low knee and high knee
in mV/cell/°C. (Compensation equals zero at 25°C.)
•
•
•
Test Relay 6 m+
OFF
Test Min Rly m+
OFF
Test Maj Rly m+
OFF
Batt Float m+
-54.00 V
Batt Max Rech m+
12 A
Comp Method m+
000000
Comp TC m+
- 3.00mV
Compensation High Knee {1}
[BATT/COMP]
Compensation Low Knee {1}
[BATT/COMP]
Discharge Threshold {1}
[BATT/SET-ALM]
High Voltage Threshold {1}
[BATT/SET-ALM]
Low Voltage Threshold {1}
[BATT/SET-ALM]
High Temperature Threshold {1}
[BATT/SET-ALM]
Low Temperature Threshold {1}
[BATT/SET-ALM]
The temperature compensation high knee is the point above
which there is no additional battery voltage compensation for
further increases in temperature.
The temperature compensation low knee is the point below
which there is no additional battery voltage compensation for
further decreases in temperature.
An alarm is generated if the battery discharge current exceeds
this value.
An alarm is generated if the magnitude of the battery voltage
rises above this value.
An alarm is generated if the magnitude of the battery voltage
drops below this value.
An alarm is generated if the battery temperature exceeds this
value.
An alarm is generated if the battery temperature drops below
this value.
Comp Hknee m+
40.0 C
Comp Lknee m+
0.0 C
Batt Disc Thr m+
10 A
Batt HV Thr m+
-58.00 V
Batt LV Thr m+
-44.00 V
Batt HT Thr m+
70.0 C
Batt LT Thr m+
0.0 C
42 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
(Table 6-1. Parameter Locations, Descriptions, and Default Values)
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
Battery Alarms
Discharge Alarm {1}
[BATT/SET-ALM]
High Voltage Alarm {1}
[BATT/SET-ALM]
Low Voltage Alarm {1}
[BATT/SET-ALM]
High Temperature Alarm {1}
[BATT/SET-ALM]
Low Temperature Alarm {1}
[BATT/SET-ALM]
RECTIFIER SETUP
Fail Safe Voltage {1}
[MODULES/RECT/PARAM]
Communications Timeout {1}
[MODULES/RECT/PARAM]
Rectifier Information NOTE: This information can be viewed for each rectifier
Rectifier Description
[MODULES/RECT/INFO]
An alarm that is generated if the battery discharge current
exceeds the programmed battery discharge threshold.
An alarm that is generated if the magnitude of the battery
voltage rises above the high voltage threshold.
An alarm that is generated if the magnitude of the battery
voltage drops below the low voltage threshold.
An alarm that is generated if the battery temperature exceeds
the high temperature threshold.
An alarm that is generated if the battery temperature drops
below the low temperature threshold.
Rectifier default output voltage if communication with the
control unit fails.
The maximum rectifier communications response time
allowed before a communications failure is declared.
installed by using the horizontal arrow keys.
Displays the model number of the installed rectifier.
Batt Disc Alm m+
Minor
Batt HV Alm m+
Minor
Batt LV Alm m+
Minor
Batt HT Alm m+
Minor
Batt LT Alm m+
Minor
Rect Fail Safem+
-54.00 V
Rect Fail Commm+
1 min
Rect 1 Desc #
MRF28H54
Rectifier Current
[MODULES/RECT/INFO]
Current Limit Alarm
[MODULES/RECT/INFO]
Standby Alarm
[MODULES/RECT/INFO]
Fan Fail Alarm
[MODULES/RECT/INFO]
Rectifier Fault Alarm (RFA)
[MODULES/RECT/INFO]
Rectifier Alarms
Current Limit Alarm {1}
[MODULES/RECT/SET-ALM]
A display of the dc output current for the individual rectifier.
The status will be “ON” if the rectifier has been forced into
its current limited mode.
The status will be “ON” if the control unit is holding the
rectifier in the standby mode.
The status will be “ON” if the rectifier fan has failed.
The status will be on if the rectifier output has failed.
This alarm indicates that a rectifier has been forced into the
current limited mode.
Rect 1 Curr #
24.9 A
Rect 1 CL #
OFF
Rect 1 Stdby #
OFF
Rect 1 FF #
OFF
Rect 1 RFA #
OFF
Rect CL Alm m+
nofN
MX28B-1200/2400 43
MX28B-1200 PRODUCT MANUAL Revision B
(Table 6-1. Parameter Locations, Descriptions, and Default Values)
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
Standby Alarm {1}
[MODULES/RECT/SET-ALM]
This alarm indicates that the control unit is holding a rectifier
in the standby mode.
Rect Stdby Almm+
nofN
Fan Fail Alarm {1}
[MODULES/RECT/SET-ALM]
RFA Alarm {1}
[MODULES/RECT/SET-ALM]
CIRCUIT BREAKER SETUP
Breaker 1 Alias {1}
[MODULES/CIRBKR/ALIAS]
•
•
•
Breaker 72 Alias {1}
[MODULES/CIRBKR/ALIAS]
Circuit Breaker Alarms
Breaker 1 Tripped {1}
[MODULES/CIRBKR/SET-ALM]
•
•
•
This alarm indicates that a rectifier fan has failed.
This alarm indicates that a rectifier output has failed.
An alternate name (alias) that can be assigned to a circuit
breaker if desired.
•
•
•
An alternate name (alias) that can be assigned to a circuit
breaker if desired.
An alarm that indicates Circuit Breaker 1 is tripped.
•
•
•
Rect FF Alm m+
nofN
Rect RFA Alm m+
nofN
Cir Bkr 1 m+
-48V
•
•
•
Cir Bkr 72 m+
-48V
Cir Bkr 1 Alm m+
Major
•
•
•
Breaker 72 Tripped {1}
[MODULES/CIRBKR/SET-ALM]
FUSE SETUP
Fuse 1 Alias {1}
[MODULES/FUSE/ALIAS]
•
•
•
Fuse 16 Alias {1}
[MODULES/FUSE/ALIAS]
An alarm that indicates Circuit Breaker 24 is tripped.
An alternate name (alias) that can be assigned to a Fuse 1 if
desired.
•
•
•
An alternate name (alias) that can be assigned to a Fuse 16 if
desired.
Cir Bkr 72 Almm+
Major
FUSE 1 +
-48V
•
•
•
FUSE 16 +
-48V
44 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
(Table 6-1. Parameter Locations, Descriptions, and Default Values)
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
FUSE Fuse Alarms
Fuse 1 Blown {1}
[MODULES/FUSE/SET-ALM]
•
•
•
Fuse 16 Blown {1}
[MODULES/FUSE/SET-ALM]
INPUT RELAY SETUP
Input Relay 1 Alias {1}
[SYSTEM/IN-RLY/ALIAS]
•
•
•
Input Relay 4 Alias {1}
[SYSTEM/IN-RLY/ALIAS]
Input Relay Alarms
Input Relay 1 {1}
[SYSTEM/IN-RLY/RLY-MAP]
An alarm that indicates Fuse 1 is blown.
•
•
•
An alarm that indicates Fuse 16 is blown.
An alternate name (alias) can be assigned to the relay if
desired.
•
•
•
An alternate name (alias) can be assigned to the relay if
desired.
An alarm activated in response to an external contact closure
or opening at the Input Relay 1 connection.
FUSE 1 Alm m+
Major
•
•
•
FUSE 16 Alm m+
Major
In-Rly 1 m+
Input Relay 1
•
•
•
In-Rly 4 m+
Input Relay 4
In-Rly 1 Alm m+
Ignore
•
•
•
Input Relay 4 {1}
[SYSTEM/IN-RLY/RLY-MAP]
OUTPUT RELAY SETUP
Output Relay 1 Alias {1}
[SYSTEM/OUT-RLY/ALIAS]
•
•
•
Output Relay 6 Alias {1}
[SYSTEM/OUT-RLY/ALIAS]
Output Relay Minor Alias {1}
[SYSTEM/OUT-RLY/ALIAS]
An alarm activated in response to an external contact closure
or opening at the Input Relay 4 connection.
An alternate name (alias) can be assigned to the relay if
desired.
An alternate name (alias) can be assigned to the relay if
desired.
An alternate name (alias) can be assigned to the relay if
desired.
•
•
•
•
•
•
In-Rly 4 Alm m+
Ignore
Out-Rly 1 m+
Relay 1
•
•
•
•
•
•
Out-Rly 6 m+
Relay 6
Relay Minor m+
Minor
MX28B-1200/2400 45
MX28B-1200 PRODUCT MANUAL Revision B
(Table 6-1. Parameter Locations, Descriptions, and Default Values)
PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
Output Relay Major Alias {1}
[SYSTEM/OUT-RLY/ALIAS]
An alternate name (alias) can be assigned to the relay if
desired.
Relay Major m+
Major
Output Relay 1 Delay {1}
[SYSTEM/OUT-RLY/RLY-MAP]
•
•
•
Output Relay 6 Delay {1}
[SYSTEM/OUT-RLY/RLY-MAP]
Output Relay Alarms
Output Relay 1 {1}
[SYSTEM/OUT-RLY/RLY-MAP]
•
•
•
Output Relay 6 {1}
[SYSTEM/OUT-RLY/RLY-MAP]
LVD SETUP
LVD1 Trip {1}
[MODULES/LVD/PARAM]
Delay between sensing of the alarm condition and activation
of the alarm relay. An alarm condition must exist for longer
than the delay to be activated.
•
•
•
Delay between sensing of the alarm condition and activation
of the alarm relay. An alarm condition must exist for longer
than the delay to be activated.
Output Relay 1 alarm can be “mapped” to activate other
output relays (“Ignore” activates no additional relays).
•
•
•
Output Relay 6 alarm can be “mapped” to activate other
output relays (“Ignore” activates no additional relays).
LVD1 trip (disconnect) threshold voltage.
Out-Rly 1 Dly m+
0 sec
•
•
•
Out-Rly 6 Dly m+
0 sec
Out-Rly 1 Alm m+
Ignore
•
•
•
Out-Rly 6 Alm m+
Ignore
LVD1 Trip m+
-42.00 V
LVD1 Restore {1}
[MODULES/LVD/PARAM]
LVD2 Trip {1}
[MODULES/LVD/PARAM]
LVD2 Restore {1}
[MODULES/LVD/PARAM]
LVD Alarm
LVD1 Option {1}
[MODULES/LVD/SET-ALM]
LVD1 Alarm {1}
[MODULES/LVD/SET-ALM]
LVD2 Option {1}
[MODULES/LVD/SET-ALM]
LVD2 Alarm {1}
[MODULES/LVD/SET-ALM]
LVD1 restore (reconnect) threshold voltage.
LVD2 trip (disconnect) threshold voltage.
LVD2 restore (reconnect) threshold voltage.
Set to “Enable” if the unit has an LVD1.
Sets the priority or “mapping” of an LVD1 Alarm.
Set to “Enable” if the unit has an LVD2.
Sets the priority or “mapping” of an LVD2 Alarm.
LVD1 Reset m+
-48.00 V
LVD2 Trip m+
-42.00 V
LVD2 Reset m+
-48.00 V
LVD1 Option m+
Enable
LVD1 Open Alm m+
Minor
LVD2 Option m+
Enable
LVD2 Open Alm m+
Minor
46 MX28B-1200/2400
Revision B MX28B-1200 PRODUCT MANUAL
MX28B-1200/2400 47
MX28B-1200 PRODUCT MANUAL Revision B
48 MX28B-1200/2400
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