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DC POWER PLANT
PRODUCT MANUAL
MODEL MX28B1200/2400+27V
APC DC Network Solutions Inc.
11035 Switzer Avenue
Dallas, TX 75238 Part Number 990-9166
800-800-4APC Preliminary release
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MX28B-1200+27V PRODUCT MANUAL Rev 1
Product Structure
Component
MX28B1200/2400+27V Main Bay
MX28B1200/2400+27V Main Bay
DC Distribution Options +24V
Small Breakers
LVD Options +24V
Description Part Number
1200 amp frame, 2400 amp carry through,
controller. No rectifiers, converters, no
distribution
1200 Amp expansion frame, No rectifiers,
distribution.
Main and/or extension Bay
38 +27V breakers and 8 –48V volt
breakers
Main and/or extension Bay
0M-91147
Available soon
0M-91145
No LVD TBD
Battery LVD TBD
Converter Shelf Option
No Converters
TBD
Converter Shelf, Input power
breakers, distribution breakers
Provides power to, and distribution from
converters
0M-6176
Rectifiers +27V @ 100 Amps each 1MRF28H27BV
Converters -50V @ 10 Amps each AAC-0010
Battery Temperature Probe 15 ft. (4.6m) FFA-0013-1
50 ft. (15.2m) FFA-0013-2
*Note: DC-to-DC converters are available in the main frame only.
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REVISION HISTORY
Revision Date By Description
1 09/12/2001 JNF Initial release.
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MX28B-1200+27V PRODUCT MANUAL Rev 1
TABLE OF CONTENTS
1 GENERAL INFORMATION...........................................................................................................1
1.1 INTRODUCTION.................................................................................................................................................................1
1.2 PRECAUTIONS....................................................................................................................................................................1
1.3 INSPECTION UPON RECEIPT OF G OODS..........................................................................................................................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............................................................................................................3
3.1 G ENERAL PROVISIONS..................................................................................................................................................... 3
3.1.1 Warranty Returns..................................................................................................................................................3
3.1.2 Warranty Repair or Replacement .......................................................................................................................3
3.2 EXCLUSIONS AND LIMITATIONS.....................................................................................................................................4
4 PRODUCT OVERVIEW AND TECHNICAL DESCRIPTION.........5
4.1 DESCRIPTION.....................................................................................................................................................................5
4.2 POWER OUTPUT CAPACITY.............................................................................................................................................7
4.3 RECTIFIERS........................................................................................................................................................................7
4.4 CONVERTERS.....................................................................................................................................................................7
4.5 CONTROL UNIT.................................................................................................................................................................8
4.6 AC INPUT POWER.............................................................................................................................................................8
4.7 BATTERY CONNECTIONS..................................................................................................................................................9
4.8 +24V DC DI STRIBUTION................................................................................................................................................. 9
4.9 –48 V DC DISTRIBUTION FROM CONVERTERS (OPTIONAL) ....................................................................................10
4.10 ENVIRONMENTAL...........................................................................................................................................................11
4.11 MECHANICAL..................................................................................................................................................................11
4.12 COMPLIANCE...................................................................................................................................................................11
5 INSTALLATION PROCEDURES..........................................................................................12
5.1 PREPARATION..................................................................................................................................................................12
5.1.1 Recommended Tools...........................................................................................................................................12
5.1.2 Recommended Test Equipment.........................................................................................................................12
5.1.3 Equipment Inspection.........................................................................................................................................12
5.1.4 Safety Precautions...............................................................................................................................................12
5.1.5 Room/Locations...................................................................................................................................................13
5.1.6 Mounting...............................................................................................................................................................13
5.1.7 Ventilation............................................................................................................................................................14
5.2 AC SERVICE AND G ROUND CONNECTIONS................................................................................................................ 14
5.3 BATTERY CONNECTIONS...............................................................................................................................................15
5.3.1 Battery Disconnect ..............................................................................................................................................15
5.3.2 Cable Sizing Considerations.............................................................................................................................16
5.3.3 Connecting the Cables.......................................................................................................................................16
5.4 DC SYSTEM GROUNDING......................................................................................................................................16
5.5 RECTIFIER INSTALLATION.............................................................................................................................................17
5.6 CONVERTER INSTALLATION ..........................................................................................................................................17
5.7 ALARM CONNECTIONS ...................................................................................................................................................18
5.7.1 External Alarm Inputs........................................................................................................................................19
5.7.2 Alarm Outputs......................................................................................................................................................19
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5.8 CONNECTING THE LOADS.............................................................................................................................................20
5.8.1 DC Circuit Breakers...........................................................................................................................................20
5.8.2 Installation of Circuit Breakers........................................................................................................................21
5.8.2.1 24V Circuit Breaker Load Connections ......................................................................................................21
5.8.2.2 –48V Circuit Breaker Load Connections ....................................................................................................21
5.9 BATTERY TEMPERATURE PROBE INSTALLATION......................................................................................................22
5.10 POWER-UP AND CHECKOUT..........................................................................................................................................22
5.10.1 Apply AC Power.............................................................................................................................................23
5.10.2 System Parameters Verification/Adjustment.............................................................................................23
5.10.3 Full System Power Up...................................................................................................................................24
6 SETUP, ADJUSTMENTS, AND OPERATION.....................................................25
6.1 USER INTERFACE ............................................................................................................................................................25
6.2 SNMP INTERFACE..........................................................................................................................................................26
6.3 EXTERNAL ALARM INPUTS...........................................................................................................................................26
6.4 ALARM OUTPUT RELAYS..............................................................................................................................................26
6.5 PARAMETER LOCATIONS, DESCRIPTIONS, AND DEFAULT V ALUES........................................................................27
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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 repr esentative or APC at (800) 800-4172 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 upon taking delivery while the
carrier representative is STILL ON SITE. Please be sure that all items are accounted for,
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.
If damage has occurred or the quantity of items is not correct, then:
1) Make a descriptive notation on the delivery receipt before signing.
2) File a damage or shortage report with the carrier that delivered the shipment.
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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.
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 in spect 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).
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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
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 TECHNI CAL DESCRIPTION
4.1 Description
The APC Models MX28B1200+27V represents a family of stand-alone +24V DC power plants.
Through the use of modular power, a system is configurable in such a manner that it will support
most typical applications within the spe cified current range of up to 1200 amps without special
application engineering or assistance. The expansion bay, which will increase the output to 2400
Amps, will be available shortly.
The system is capable of supplying 1200 amps of +24V DC power in a sin gle frame with integrated
power distribution and an advanced control and monitoring module. Standard distribution for a
power bay includes up to 38 plug-in circuit breakers ranging from 1 to 100 amps. An optional +24V
to -48V Converter shelf is available to power up to 80 Amps of –48V loads that can be distributed by
up to 7 circuit breakers. An optional low voltage disconnect (LVD) can be provided on the battery
side. A 1200 amp MX28B+27V with converters is shown in. Figure 4-1. A block diagram is show n
in Figure 4–2
Figure 4-1 MX28B-1200/2400+27V
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USER INFRASTRUCTURE
UTILITY
AC
BATTERY
PLANT
+24V RECTIFIERS
BATTERY
DISCONNECT
LVD
(OPTIONAL)
+24V BUS
MASTER
CONTROLLER
-48V DC/DC
CONVERTERS
WEB/SNMP
INTERFACE
-48V BUS
USER
INPUT/OUTPUT
-48V
LOADS
+24V
LOADS
RETURN BUS
BATTERY SHUNT
MX28B-1200 +27
Figure 4-2 MX28B1200/2400+27V System Diagram
6
MAIN GND
BUS
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4.2 Power Output Capacity
A power frame consists of three rectifier shelves, each shelf accommodating up to four hot-plug, 100
amp rectifiers. A completely configured power frame with 12 rectifiers is rated at 1200 amps. The
master control unit provides control and monitoring for the entire system.
The optional converter shelf supports up to eight hot-plug +24/-48V DC/DC converters. Each
converter is rated at 10 Amps.
4.3 Rectifiers
APC Model MRF28H27BV 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: 27.2V DC
• Overvoltage Protection: Set at 31.5V DC
• Output Current per Rectifier: 100A Minimum Continuous
• Power Output per Rectifier: 2800W Continuous, Vin > 198V ac
• Efficiency: 89% Typical
• Cooling: Fan cooled, front to rear airflow
• Ambient Temperature: -25°C to 55°C Operational
4.4 Converters
APC Vector Series with specifications as follows:
• Input Voltage: +20V DC to +30V DC
• Input Current per converter: <30 amps
• Output Voltage: -50VDC (-48V DC to –52V DC)
• Output current per converter: 10 amps
• Power output per converter: 520 Watts
• Efficiency: >85%
• Cooling: Fan cooled, front to rear airflow
• Ambient temperature: -40°C to 55°C Operational
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4.5 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 6 shelves of four rectifiers each and up to 8 DC to DC Converters
• Individual alarm monitoring of 72 breakers
• Individual alarm monitoring of 16 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)
• WEB/SNMP Interface Card for remote monitoring
4.6 AC Input Power
Each rectifier shelf requires 208/220/240V ac, single-phase, 50/60 Hz, supplied through an external
80-amp breaker. Three Vertical wire conduits in the left rear of the frame provide routing for AC
input power connection of each shelf. The Earth Ground wiring is factory installed to each rectifier
shelf. A power entry box with 3 pilot holes is provided at the top and rear of the frame where AC
wiring conduit can be run. Refer to Figure 4-3.
AC wire conduits (3)
Figure 4.3 Power Entry Box
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4.7 Battery connections
Battery connections are made at the top rear of the unit. The +24V and Battery Return buses each
provide two sets of 3/8” -16 holes on 1 inch or 1 ¾ inch centers for connecting two-hole battery cable
lugs. Refer to Figure 4-4.
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.
- +
4.8 +24V DC Distribution
A standard power distribution module can mount up to 38 plug-in circuit breakers providing +24V
power for customer loads. Each breaker row is connected at its center to the +24V DC bus, with each
column having an ampacity of 300A. Connections for the +24V DC loads are located directly above
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 connect to a return bus directly above the top row of
circuit breakers. The return bus contains a pattern for 40 two-hole #10-32 lugs on 5/8-inch centers.
Figure 4-5 shows the power plant’s DC distribution section.
Figure 4.4 Battery Connections
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+24V load supply
Load Return Bus.
Thirty-eight +24V Breakers
4.9 –48 V DC Distribution from Converters (Optional)
Up to eight 24V/-48V dc converters can be used to supply power for –48V loads in increments of 10
Amps each. These converters are mounted at to bottom of the unit. Each converter is powered via a
circuit breaker located directly below. See figure 4.6
Seven -48V Breakers
For DC to DC converters
Figure 4.5 DC Distribution.
Figure 4.6 DC-to-DC Converters.
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4.10 Environmental
• Ambient Temperature: -4°F to 149°F (-20°C to +65°C) operating
-40°F to 185°F (-40°C to +85°C) storage
• Humidity: 0% to 85% RH non-condensing operating
0% to 95% RH non-condensing storage
• Altitude: Up to10,000 feet (3000m) operating
Up to 33,000 feet (10,000m) storage
4.11 Mechanical
• Weight: Power Frame – 550 to 600 lbs. (250 to 272 kg)
Rectifier - 11 lbs. (5 kg.)
Converters – 7.2 lbs. (3.3 kg.)
• Dimensions Frame: 84” high x 24.25” wide x 18” deep
(2134 mm x 616 mm x 457 mm)
• Color: Dawn Gray (fronts)
4.12 Compliance
• Safety: UL-1950 (Pending)
• NEBS Level 1 (Pending)
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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 power plant is supplied from a nominal 230V AC, 50/60 Hz source. Keep All AC input
enclosure covers 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 +24 and -48V DC distribution
connection areas 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 MX28B1200/2400+27V 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.
5.1.6 Mounting
The unit is designed to be bolted to the floor of the housing structure. Figure 5-1 shows the footprint
of the frame and the mounting points with dimensions. 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 5-1 Floor Mounting Dimensions
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5.1.7 Ventilation
The rectifiers have fans that provide front to rear airflow for internal cooling. The MX28B1200
housing should mounted to allow free airflow from the front and out the top of the unit. [Refer to
Section 4.10 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, single-phase, 50/60 Hz power
through individual external 80-amp circuit breakers to the AC input terminal block connections for
each rectifier shelf the system. Each rectifier shelf has four 20-amp breakers, each serving one
rectifier. The AC Grounding wiring, from the Earth terminal block to the individual shelves is factory
installed for each shelf installed. Connections to the AC input connector for each rectifier, is factory
installed.
AC Grounding
wires
Figure 5-2 AC Wiring conduit
Figure 5-3 AC Wiring Terminal
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The AC input enclosure, located at the top rear of the MX28B housing, is provided with three pilot
holes in the top for attaching external conduit (Figure 5-4), and three 1-inch conduits exiting the
bottom for AC wire. AC wiring passing through the conduit will be routed through the access
opening in the AC input enclosure into the wiring area where a safety ground bar and rectifier input
terminal blocks are located. The terminal blocks are labeled as “L1” and “L2/N” for connection of the
two AC wires (Figure 5-3). Each terminal block represents connections for all 4 rectifiers in the
shelf.
The suggested wire size for L1, and L2 is #4 AWG rated at 105°C; however, the ambient temperature
and number of wires in a conduit must also be considered in accordance with NEC requirements. Be
sure to follow any local electrical wiring codes. Terminate the ground wire in the AC box at the top of
the unit to the ground terminal blo ck. Continue to run the remaining two wires into the individual
conduits to each rectifier shelf. Connect them to L1, and L2 of the terminal block behind the access
plate.
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.
Figure 5-4
Pilot holes (3)
5.3 Battery Connections
5.3.1 Battery Disconnect
An external circuit breaker or fused disconnect (not supplied) is recommended in the positive 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 or fuse for a battery string
should take into account maximum battery short circuit current and cable sizing.
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Battery Positive (
+
)
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 5-5. The battery
negative (return bus) and battery positive (+24V) buses each provide two sets of 3/8” -16 holes on a double
pattern one -inch and 1 ¾-inch 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 inlbs.
Battery Negative (-)
Figure 5-5 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 NEGATIVE 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 rectifiers are shipped in separate containers. Follow the procedure below to ins tall a rectifier.
1) Remove the rectifier from its shipping box.
2) Slide the rectifier into the shelf between the guides until fully seated.
3) Fasten the rectifier in place with the rectifier retaining screw included in the shipment.
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 Converter Installation
The converters are also shipped in separate containers.
1) Remove the Converter from its shipping box.
2) Slide the converter into its shelf until fully seated.
3) Tighten the retaining screw mounted on the lower front on the converter.
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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 “0P9133” is mounted in the space above the master control unit and
provides terminal block connection points for alarm outputs and alarm inputs (Figure 5-7). These
cage-clamp terminal blocks are operated by pushing back the lever, inserting the wir e 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
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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
J4 TERMINAL
DESIGNATION
(NO-NC-C)
NO1-NC1-C1
NO2-NC2-C2
NO3-NC3-C3
NO4-NC4-C4
Table 5-2. External Alarm Input Connections
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.
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MX28B-1200+27V PRODUCT MANUAL Rev 1
ALARM
OUTPUT
RELAY #1
RELAY #2
RELAY #3
RELAY #4
RELAY #5
RELAY #6
MINOR
MAJOR
Table 5-3. Alarm Output Connections
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
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
5.8 Connecting The Loads
5.8.1 DC Circuit Breakers.
Various circuit breakers 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.
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
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5.8.2 Installation of Circuit Breakers
1) Remove the metal circuit breaker cover panels.
2) Use diagonal cutters to cut the metal web of the breaker panel “knock-outs” at the desired
breaker locations.
3) 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 5-8. 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.
***** CAUTION *****
During circuit breaker installation, carefully align the breaker alarm terminals with the alarm terminal
board to avoid breaker terminal damage.
4) Reattach the circuit breaker cover panels.
Figure 5-8 Plug -in Circuit Breaker Insertion
5.8.2.1 24V Circuit Breaker Load Connections
Connections for the +24V DC loads are located directly above 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 the return bus directly above the top
row of circuit breakers. These return buses contain patterns for 40 two-hole #10-32 lugs on 5/8-inch
centers.
5.8.2.2 –48V Circuit Breaker Load Connections
Connections for the –48V DC loads are made directly above 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 the return bus located above the
upper circuit breakers.
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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 on the left side of the control unit
backplane 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.
Figure 5-10 J5 Location
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 or fused disconnect 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 be connected).
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.
4) Verify that converters if installed are set to ON and have their respective breakers ON.
J5
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5.10.1 Apply AC Power
Turn on the circuit breakers that supply AC power to the rectifier shelves in the MX28B DC power
plant. Turn on the individual 20 Amp circuit breakers for each rectifier on the shelf. The main screen
should appear on the control unit display (see Figure 5-10). The display on the control unit is a 2-line
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 5-10 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.
MX28B1200 24V +
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 = +27.00V DC (Check the manufacturer’s recommendation
for the batteries being used in the system.)
2) Battery Maximum Recharge Rate - default = 200A. (Bellcore specifications recommend a
maximum charging rate of battery capacity (in Ampere-hours) divide d by 20 hours; check the
manufacturer’s recommendation.)
3) System Voltage - measurement ≅ +27.00V 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.
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MX28B-1200+27V PRODUCT MANUAL Rev 1
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 may now be turned on and inserted as required.
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Rev 1 MX28B-1200+27V 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 “ï” (left), “ð” (right), “ñ” (up), and
“ò” (down) arrow keys located on the front panel. The selected item on the display is identified by
the cursor cycling beneath its characters.
MX28B1200 24V +
STATUS ALARMS SYSTEM MODULES BATT PIN OEM
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 60-second period during which no alarms
are reported.
Pressing the "M" key on the front panel will change the "m+" to "M+", indicating tha t 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 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.
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MX28B-1200+27V PRODUCT MANUAL Rev 1
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 SNMP Interface
In addition, the unit’s controller incorporates a 10-base T Ethernet connection to allow remote access
to the system signals, and remote control of certain aspects of its operation. APC’s Manual #9910181 in the form of a CDRom will allow users to set up interface with the user’s Information
Technology System. Simple Network Management Protocol (SNMP) version 1 is supported along
with telnet protocol.
6.3 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.
6.4 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.
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6.5 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:
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 presente d in outline form in Figure 6.2. Each indentation to the right represents a menu level below
the indicated title.
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MX28B-1200+27V PRODUCT MANUAL Rev 1
Figure 6-2. Control Unit Menu Structure
MX28B120024V +
STATUS
Sys Voltage
Sys Current
Conv Voltage
Conv 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
Conv HV Thr
Conv HV Alm
Conv LV Thr
Conv LV Alm
Rect Cfg Alm
Rect 1ofN Alm
Rect 2ofN Alm
Conv Cfg Alm
Conv 1ofN Alm
Conv 2ofN Alm
Sys HT Thr
Sys HT Alm
Sys LT Thr
Sys LT Alm
Hw Sys V Alm
Hw Cnv V Alm
Hw Batt C Alm
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Rev 1 MX28B-1200+27V PRODUCT MANUAL
(Figure 6-2. Control Unit Menu Structure)
Hw Batt T Alm
Hw Sys T Alm
Hw LVD1 Alm
Hw LVD2 Alm
SETUP
PIN 1
PIN 2
Address 1
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
(Figure 6-2. Control Unit Menu Structure)
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MX28B-1200+27V PRODUCT MANUAL Rev 1
ALIAS
In-Rly 1
In-Rly 2
In-Rly 3
In-Rly 4
DIAG
Store Cfg
Lamp Test
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 # Curr
Rect # CL
Rect # Stdby
Rect # FF
Rect # RFA
Conv
SET-ALM
Conv CL Alm
Conv Stdby Alm
Conv FF Alm
Conv CFA Alm
PARAM
Conv Fail Safe
Conv Fail Comm
INFO
Conv # Curr
Conv # CL
Conv # Stdby
Conv # FF
Conv # CFA
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Rev 1 MX28B-1200+27V PRODUCT MANUAL
(Figure 6-2. Control Unit Menu Structure)
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
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
(Figure 6-2. Control Unit Menu Structure)
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MX28B-1200+27V PRODUCT MANUAL Rev 1
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
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
(Figure 6-2. Control Unit Menu Structure)
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PIN
PIN
OEM
OEM R Offset
OEM R Gain
OEM C Offset
OEM C Gain
OEM S Offset
OEM S Gain
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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 C Offset {2}
[OEM]
OEM C Gain {2}
[OEM]
OEM S Offset {2}
[OEM]
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.
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.
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 C Offset m+
0.000 V
OEM C Gain m+
1.000 V
OEM S Offset m+
0.0 A
OEM S Gain {2}
[OEM]
Site Address/Identification
Address 1 {1}
[SYSTEM/SETUP]
Address 2 {1}
[SYSTEM/SETUP]
Address 3 {1}
[SYSTEM/SETUP]
Control Unit Setup & Info.
Model {2}
[SYSTEM/SETUP]
Temperature Scale {1}
[SYSTEM/SETUP]
Control Unit Revision
[SYSTEM/SETUP]
Firmware Version
[SYSTEM/SETUP]
Current gain adjustment for factory calibration of battery
current readings/settings.
Power plant address or identification - first line.
Power plant address or identification - second line.
Power plant address or identification - third line.
Model name for the DC power plant “reset defaults”
selection will re-initialize to factory settings for model
selected
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.
OEM S Gain m+
1.000 A
Address 1 m+
APC
Address 2 m+
11035 Switzer Av
Address 3 m+
Dallas, TX.
Model m+
MX28B 1200 24V
Fahrenheit m+
OFF
Cntrl Rev +
000002
FW Version +
000131
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PARAMETER DESCRIPTION DISPLAY SCREENS /
DEFAULT SETTINGS
Display Type
[SYSTEM/SETUP]
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 Voltage Threshold {1}
[SYSTEM/SET-ALM]
Low Volt age Threshold {1}
[SYSTEM/SET-ALM]
High Temperature Threshold {1}
[SYSTEM/SET-ALM]
Low Temperature T hreshold {1}
[SYSTEM/SET-ALM]
Type number for the control unit display.
Internal system calendar date.
Internal system clock time (24-hour format).
System High voltage alarm threshold.
System Low voltage alarm threshold.
Converter High voltage alarm threshold.
Converter Low voltage alarm threshold.
Over temperature alarm threshold.
Under temperature alarm threshold.
Display Type +
000255
Date m+
DEC 16 1999
Time m+
9:00:25
Sys HV Thr m+
28.00 V
Sys LV Thr m+
25.00 V
Conv HV Thr m+
-52.00 V
Conv LV Thr m+
-48.00 V
Sys HT Thr m+
70.0 C
Sys LT Thr m+
0.0 C
System Status
System Voltage
[STATUS]
System Current
[STATUS]
Converter Voltage
[STATUS]
Converter Current
[STATUS]
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 output voltage measured between the MX28B DC
power plant +27V and return buses.
The total system output current (calculated as the sum of the
individual rectifier output currents).
Converter output voltage measured be tween the MX28B DC
power plant -48V and return buses.
The total converter output current (calculated as the sum of
the individual converter output currents).
System temperature measured within the control unit. Note:
Will read about -156° C with no probe attached
Battery current measured at the current shunt.
Battery temperature measured by the optional battery
temperature sensor probe.
S ystem voltage is above the high voltage threshold.
System voltage is below the low-voltage threshold.
Sys Voltage +
27.00 V
Sys Current +
1120.8 A
Conv Voltage +
-50.00 V
Conv Current +
68.2 A
Sys Temp +
25.2 C
Batt Current +
15.0 A
Batt Temp +
25.2 C
Sys HV Alm m+
Minor
Sys LV Alm m+
Minor
Converter High Voltage {1}
[SYSTEM/SET-ALM]
Converter voltage is above the high voltage threshold
Conv HV Alm m+
Minor
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Converter Low Voltage {1}
[SYSTEM/SET-ALM]
System High Temperature {1}
[SYSTEM/SET-ALM]
System Low Temperature {1}
[SYSTEM/SET-ALM]
Rectifier Configuration {1}
[SYSTEM/SET-ALM]
Rectifier Fail 1-of-N {1}
[SYSTEM/SET-ALM]
Rectifier Fail 2-of-N {1}
[SYSTEM/SET-ALM]
Converter Configuration {1}
[SYSTEM/SET-ALM]
Converter Fail 1-of-N {1}
[SYSTEM/SET-ALM]
Converter Fail 2-of-N {1}
[SYSTEM/SET-ALM]
Hardware System Voltage {2}
[SYSTEM/SET-ALM]
Converter voltage is below the low-voltage threshold.
The control unit temperature is above the high temperature
threshold.
The control unit temperature is below the low temperature
threshold.
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.
The converter configuration differs from its stored
configuration.
Converter Fail 1-of-N alarm - one rectifier has at least one
alarm condition.
Converter 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.
Conv LV Alm m+
Minor
Sys HT Alm m+
Minor
Sys LT Alm m+
Minor
Rect Cfg Alm m+
Minor
Rect 1ofN Alm m+
Minor
Rect 2ofN Alm m+
Major
Conv Cfg Alm m+
Minor
Conv 1ofN Alm m+
Minor
Conv 2ofN Alm m+
Major
Hw Sys V Alm m+
Minor
Converter 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]
SYSTEM ALARMS DISPLAY
Alarms Item 1
[ALARMS]
•
•
Alarms Item 16
[ALARMS]
SYSTEM DIAGNOSTICS
This alarm indicates there is a hardware failure in the
converter voltage monitoring function.
This alarm indicates there is a hardware failure in the battery
current monitoring fun ction.
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.
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).
Hw Cnv 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
Alarm Item 1 +
Batt LV Alm On m
•
•
Alarm Item 16 +
Store Configuration {1}
[SYSTEM/DIAG]
Lamp Test {1}
[SYSTEM/DIAG]
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.
Store Cfg m+
Disable
Lamp Test m+
OFF
36
Page 43
Rev 1 MX28B-1200+27V PRODUCT MANUAL
Test Relay Enable {1}
[SYSTEM/DIAG]
Test Relay 1 {1}
[SYSTEM/DIAG]
•
•
•
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]
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.
Setting this parameter to “ON” energizes Relay 1 and turns
on the “ALM1” LED on the control unit front panel.
•
•
•
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 bat tery temperature.
Maximum battery recharge current (the system limits the
charging current to this programmable value).
Test Relay En m+
Disable
Test Relay 1 m+
OFF
•
•
•
Test Relay 6 m+
OFF
Test Min Rly m+
OFF
Test Maj Rly m+
OFF
Batt Float m+
27.00 V
Batt Max Rech m+
100A
Compensation Method {1}
[BATT/COMP]
Temperature Compensation {1}
[BATT/COMP]
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]
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.)
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 be low
this value.
Comp Method m+
000000
Comp TC m+
- 3.00mV
Comp Hknee m+
40.0 C
Comp Lknee m+
0.0 C
Batt Disc Thr m+
100 A
Batt HV Thr m+
28.00 V
Batt LV Thr m+
22.00 V
Batt HT Thr m+
70.0 C
Batt LT Thr m+
0.0 C
37
Page 44
MX28B-1200+27V PRODUCT MANUAL Rev 1
(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 Current
[MODULES/RECT/INFO]
An alarm that is ge nerated 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.
A display of the DC output current for the individual
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+
27.00 V
Rect Fail Commm+
1 min
Rect 1 Curr #
24.9 A
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]
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 CL #
OFF
Rect 1 Stdby #
OFF
Rect 1 FF #
OFF
Rect 1 RFA #
OFF
Rect CL Alm m+
n of N
38
Page 45
Rev 1 MX28B-1200+27V PRODUCT MANUAL
(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+
n of N
Fan Fail Alarm {1}
[MODULES/RECT/SET-ALM]
RFA Alarm {1}
[MODULES/RECT/SET-ALM]
CONVERTER SETUP
Fail Safe Voltage {1}
[MODULES/CONV/PARAM]
Communications Timeout {1}
[MODULES/CONV/PARAM]
Converter Information NOTE: This information can be viewed for each
Converter Current
[MODULES/CONV/INFO]
Current Limit Alarm
[MODULES/CONV/INFO]
Standby Alarm
[MODULES/CONV/INFO]
Fan Fail Alarm
[MODULES/CONV/INFO]
This alarm indicates that a rectifier fan has failed.
This alarm indicates that a rectifier output has failed.
Converter default output voltage if communication with the
control unit fails.
T he maximum converter communications response time
allowed before a communications failure is declared.
converter installed by using the horizontal arrow keys.
A display of the DC output current for the individual
Converter.
The status will be “ON” if the Converter has been forced into
its current limited mode.
The status will be “ON” if the control unit is holding the
Converter in the standby mode.
The status will be “ON” if the Converter fan has failed.
Rect FF Alm m+
n of N
Rect RFA Alm m+
n of N
Conv Fail Safem+
-50.00 V
Conv Fail Commm+
1 min
Conv 1 Curr #
7.9 A
Conv 1 CL #
OFF
Conv 1 Stdby #
OFF
Conv 1 FF #
OFF
Converter Fault Alarm (CFA)
[MODULES/CONV/INFO]
Converter Alarms
Current Limit Alarm {1}
[MODULES/CONV/SET-ALM]
Standby Alarm {1}
[MODULES/CON/SET-ALM]
Fan Fail Alarm {1}
[MODULES/CON/SET-ALM]
CFA Alarm {1}
[MODULES/CON/SET-ALM]
CIRCUIT BREAKER SETU P
Breaker 1 Alias {1}
[MODULES/CIRBKR/ALIAS]
•
•
The status will be on if the Converter output has failed.
This alarm indicates that a converter has been forced into the
current limited mode.
This alarm indicates that either the control unit is holding a
converter in the standby mode or an operator has set a
converter to standby
This alarm indicates that a converter fan has failed.
This alarm indicates that a converter output has failed.
An alternate name (alias) that can be assigned to a circuit
breaker if desired.
•
•
Conv 1 CFA #
OFF
Conv CL Alm m+
n of N
Conv Stdby Almm+
n of N
Conv FF Alm m+
n of N
Conv CFA Alm m+
n of N
Cir Bkr 1 m+
+24V
•
•
39
Page 46
MX28B-1200+27V PRODUCT MANUAL Rev 1
• • •
Breaker 72 Alias {1}
[MODULES/CIRBKR/ALIAS]
Circuit Breaker Alarms
Breaker 1 Tripped {1}
[MODULES/CIRBKR/SET-ALM]
•
•
•
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 alternate name (alias) that can be assigned to a circuit
breaker if desired.
An alarm that indicates Circuit Breaker 1 is tripped.
•
•
•
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 m+
+24V
Cir Bkr 1 Alm m+
Major
•
•
•
Cir Bkr 72 Almm+
Major
FUSE 1 +
+24V
•
•
•
FUSE 16 +
+24V
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
•
•
•
•
•
•
•
•
•
40
Page 47
Rev 1 MX28B-1200+27V PRODUCT MANUAL
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]
Output Relay Major Alias {1}
[SYSTEM/OUT-RLY/ALIAS]
Output Relay 1 Delay {1}
[SYSTEM/OUT-RLY/RLY-MAP]
•
•
•
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.
An alternate name (alias) can be assigned to the relay if
desired.
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.
•
•
•
In-Rly 4 Alm m+
Ignore
Out-Rly 1 m+
Relay 1
•
•
•
Out-Rly 6 m+
Relay 6
Relay Minor m+
Minor
Relay Major m+
Major
Out-Rly 1 Dly m+
0 sec
•
•
•
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]
LVD1 Restore {1}
[MODULES/LVD/PARAM]
LVD2 Trip {1}
[MODULES/LVD/PARAM]
LVD2 Restore {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.
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.
LVD1 restore (reconnect) threshold voltage.
LVD2 trip (disconnect) threshold voltage.
LVD2 restore (reconnect) threshold voltage.
Out-Rly 6 Dly m+
0 sec
Out-Rly 1 Alm m+
Ignore
•
•
Out-Rly 6 Alm m+
Ignore
LVD1 Trip m+
21.00 V
LVD1 Reset m+
24.00 V
LVD2 Trip m+
21.00 V
LVD2 Reset m+
24.00 V
41
Page 48
MX28B-1200+27V PRODUCT MANUAL Rev 1
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]
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 Option m+
Enable
LVD1 Open Alm m+
Minor
LVD2 Option m+
Enable
LVD2 Open Alm m+
Minor
42
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