Page 2 - Table of Contents; AC P
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page ii Table of Contents 1 SAFETY FIRST! .....................................................................................................................1 1.1. W ARNING S YMBOLS ...................................................................
Page 3 - DC D
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page iii 3.10. E XTERNAL A LARM I NPUT C ONNECTIONS ..........................................................................25 3.11. R ECTIFIER M ODULE I NSTALLATION ...................................................................................
Page 5 - Revision History; Revision Date By; JNF Converted to APC numbering; Table of Figures
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page v Revision History Revision Date By Description 1 31 JAN, 2002 JNF Converted to APC numbering 2 28 SEP, 2003 BET Updated Format and added 4800 Table of Figures FIGURE 2.2-1 MX28B-1200 –48 VDC POWER PLANT RECTIFIER BAY.............................
Page 6 - Safety
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 1 1 Safety First! It is very important to follow all safety procedures when unpacking, installing and operating any sort of power equipment. 1.1. Warning Symbols CAUTION : An indication that special care is required to prevent injury, equipmen...
Page 7 - Introduction; A block diagram is shown in
2 Introduction 2.1. General Information DC Power Plants from APC have unique features that make them easy to install, maintain, and upgrade. The rectifier units are modular and truly “hot-pluggable” into the shelf assembly without any separate AC wiring. All system settings are made from the system ...
Page 10 - Installation; Section 7
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 5 3 Installation 3.1. Unpacking Equipment Remove equipment from packing material and inspect for shipping damage or missing items. It is important to report damage or material shortages to the shipping carrier while a representative is on site...
Page 11 - Mounting; shows the footprint of the box frame and the; Power Bus Connections; for details. The power bays are spliced together
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 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 3.2-1 shows the footprint of the box frame and the mounting points with dimensions (shown in inch...
Page 13 - Circuit Breaker/LVD Ribbon Cable Connections; as a guide to jumper orientation. If a cable is
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 8 Circuit Breaker/LVD Ribbon Cable Connections Additional cables must be connected between cabinets to ensure that the circuit breaker alarms in the expansion bays are reported correctly. The circuit breakers and LVDs are connected together th...
Page 14 - Fuse Alarm Ribbon Cable Connections; Ventilation; for environmental characteristics.] Free airflow should be; WARNING; : Ensure that all of the external DC and AC circuit breakers are in
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 9 Fuse Alarm Ribbon Cable Connections There is a 16-conductor ribbon cable, if any bay has fuses installed. This cable ties together the Wago breakout board in each bay with fuses. The ribbon cable must connect all the Wago breakout boards tog...
Page 15 - Do; Figure
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 10 input. The AC wiring, from the AC input terminal block connections to the hot-pluggable AC input connector for each rectifier, is factory installed. The AC input enclosure, located at the top rear of the MX28B rectifier bay, is provided wit...
Page 16 - : The MX28B DC power plant is supplied from a high voltage; : Hazardous energy levels are present on bare conductors in the -
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 11 If the AC input power is provided from a three-phase distribution panel, the circuit breaker positions should be selected such that the load is balanced as much as possible. WARNING : The MX28B DC power plant is supplied from a high voltage...
Page 17 - : Make certain that the battery polarity is correct when making
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 12 Connecting the Battery Cables WARNING : Make certain that the battery polarity is correct when making connections to the Model MX28B DC power plant. Incorrect connection could cause severe equipment damage. The battery cable connections are...
Page 19 - DC Plug-in Circuit Breakers
Figure 3.5-1 DC System Grounding Figure 3.5-2 Box Frame Ground 3.6. DC Power Output Over-Current Protection There are several different options for DC output power distribution. Distribution provides a convenient method of connecting the load cables as well as over-current protection. DC Plug-in Cir...
Page 22 - DC Bolt-in Circuit Breakers
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 17 DC Bolt-in Circuit Breakers Bolt in Breakers in a variety of sizes up to 700 Amps are available. Triple pole breakers are available in sizes ranging from 400-700 Amps. Double pole breakers are available in sizes ranging from 250-400 Amps. S...
Page 23 - Telecom Fuses
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 18 Telecom Fuses Telecom fuses in sizes ranging from 70 – 600 Amps are available. A panel in each rectifier bay will accommodate 4 fuse holders. Typical fuse numbering is Bay 1: Fuse 1-4, Bay 2: Fuse 5-8, Bay 3: Fuse 9-12 and Bay 4: Fuse 13-16...
Page 24 - Installation of Circuit Breakers and Fuses; CAUTION; terminal board as the breaker is snapped into place.; when it is turned OFF.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 19 3.7. Installation of Circuit Breakers and Fuses Plug-in Circuit Breaker Installation CAUTION During circuit breaker installation, carefully align the breaker alarm terminals with the alarm terminal board to avoid breaker terminal damage. 1)...
Page 25 - Bolt-in Circuit Breaker Installation; Reattach the circuit breaker cover panel.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 20 Bolt-in Circuit Breaker Installation 1) Remove the circuit breaker cover panel and the plastic cover(s) from the desired location(s). 2) Install the circuit breaker(s) by bolting the circuit breaker onto the bus at the bottom of the assembl...
Page 26 - Telecom Fuse Installation; Re-install the fuse holder by pushing the holder straight in.; GMT Fuse Installation
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 21 Telecom Fuse Installation 1) Remove the fuse(s) from the desired location(s) by pulling the fuse holder straight out of the fuse holder base. 2) Install the fuse(s) by bolting the fuses(s) into the fuse holder. 3) Re-install the fuse holder...
Page 27 - Each return bus provides 28 sets of
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 22 3.8. Load Connections Cable Size Considerations The DC load cable(s) should be sized sufficiently large to limit the voltage drop from the MX28B DC power plant to the loads per system design requirements. The cable(s) must also carry the fu...
Page 28 - GMT Fuse Connections; Monitoring and Relay Output Connections; Front Panel DB9 Connection
Figure 3.8-1 Load connections for snap-in breakers Figure 3.8-2 Return Connections GMT Fuse Connections GMT fuses are only connected to -48VDC if the system has been purchased with the GMT fuse option. This option supplies -48VDC to lugs on the interface card through #6 AWG power cables controlled b...
Page 30 - MINOR
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 25 RELAY OUTPUT TERMINAL DESIGNATION NO-NC-C USER ALARM NOTES RELAY #1 RELAY #2 RELAY #3 RELAY #4 RELAY #5 RELAY #6 MINOR MAJOR NO1-NC1-C1 NO2-NC2-C2 NO3-NC3-C3 NO4-NC4-C4 NO5-NC5-C5 NO6-NC6-C6 NO7-NC7-C7 NO8-NC8-C8 ________________________ __...
Page 31 - : Rectifier DC output circuits would be damaged if battery were; : Rectifier fan inlet filters are available for dusty or hostile
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 26 3.11. Rectifier Module Installation WARNING : Rectifier DC output circuits would be damaged if battery were installed incorrectly. Before rectifier installation, ensure proper battery polarity and that the battery is isolated from the rest ...
Page 32 - Commissioning and Preventive Maintenance; Environment
4 Commissioning and Preventive Maintenance 4.1. Pre-Commissioning Inspection Environment 1. Ensure the DC system environment is suitable for operation. 2. Ensure that there is sufficient clearance around the system for service. 3. Ensure that there is no sign of damage to the DC system. 4. Consult w...
Page 33 - manufacturer’s specifications.; AC Power Up; : The DC power plant is supplied from a nominal high voltage AC
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 28 b. Case leaks. c. Post- seal leaks. d. Pressure relief valve leaks (VRLA only). e. Case swelling (VRLA only). f. Case swelling (VRLA only). 10. Check the torque of all battery inter- cell connector in accordance with the battery manufacture...
Page 34 - LVD Test; at the battery connection. Also, the minor alarm should be on.; Battery Power Up; links. Arcing can occur during this connection.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 29 DC Power Up: 1. Verify with a voltmeter that the dc voltage is within 0.1 Vdc of the System Voltage. If the voltage is off adjust the R offset setting under the OEM menu. If the R Offset setting is more than +/- 1.00 Volt dc, contact APC fo...
Page 35 - User Inputs
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 30 Circuit Breaker/ Fuse Test: 1. For plug- in circuit breakers. Monitor alarm screen for circuit breaker alarm while shorting out each pair of alarm contacts (using a pair of tweezers) on the circuit breaker interface circuit board. Verify pr...
Page 37 - Operation; DC Output Power
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 32 5 Operation 5.1. Technical Description The MX28B-1200/2400 Power System is designed to supply safe –54 VDC primary power through the use of up to 24 rectifier modules. One rectifier bay may be added to increase the capacity to 48 rectifiers...
Page 39 - System Status and Alarm Reporting; for PSCU control functions.; Circuit breaker alarm contacts close when the
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 34 System Status and Alarm Reporting The PSCU monitors system voltage using a high accuracy digital voltmeter attached to the system bus. The PSCU monitors system temperature using a temperature IC mounted in the PSCU. The PSCU monitors system...
Page 40 - Battery/Load Low Voltage Disconnect; LVD 1 Trip Voltage
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 35 Battery Temperature Compensation The Battery Float Voltage is set to the value recommended by the battery manufacturer in order to maintain correct battery charge at 25ºC. As temperature rises, electrochemical activity in a battery increase...
Page 41 - APC; Parameter Locations, Descriptions, and Default Values; . To find the parameters that can be
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 36 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 c...
Page 51 - Control Unit Menu Structure; T o p L e v e l S e c o n d L e v e l T h i r d L e v e l F o u r t h L e v e l
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 46 Control Unit Menu Structure The complete menu structure shown in the order in which it is accessed from the control unit display is presented in outline form below. Each indentation to the right represents a menu level below the indicated t...
Page 57 - Front Panel LED Indicators
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 52 Front Panel LED Indicators Major (Red) On when Major Relay is de-energized* Minor (Yellow) On when Minor Relay is energized Normal (Green) On when no alarms are active ALM 1 (Red) On when Output Relay 1 is energized ALM 2 (Red) On when Outp...
Page 60 - will allow the unit to be serviced without creating false alarms.; System Visual and Safety Inspection; : Hazardous energy levels are present on bare conductors
7 Preventive Maintenance Preventive Maintenance is typically performed on a quarterly basis. 7.1. Equipment 1. 4 Digit Voltmeter. 2. Clamp-on Ampere meter. 3. Standard Insulated tools. 7.2. Inspection Environmental Inspection 1. Ensure the DC system environment is suitable for operation. 2. Ensure t...
Page 61 - Battery Visual and Safety Inspection; only approved cleaning materials.; System Voltage Test
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 56 a) DC Voltage Rating. b) DC Current Rating c) Interrupting Current Rating Battery Visual and Safety Inspection 1. Check that the battery temperature probe is firmly attached to the battery. 2. Check the mechanical integrity of the battery f...
Page 62 - controller and the customer remote alarm panel.; System Temperature Test; Determine the total battery capacity at the site:
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 57 Rectifier Current Share Test Verify that the highest rectifier current and the lowest current are within 5 amps. System Current Test Verify the System current equal to the total of the rectifier currents. System current should equal the tot...
Page 63 - Enable the LVD’s that are installed.; Battery Preventive Maintenance Procedure; the battery memory location allocated on the Cellcorder.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 58 Battery Temperature Test If the battery teperature probe is used in this system, verify that the battery temperature is correct. LVD Test 1. Verify that the Battery Float voltage is set to negative (-) 54.00 Volts via the control panel and ...
Page 64 - copy of the results on disk.
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 59 9. Ensure that all protective covers are replaced and that the battery is electrically non- hazardous to personnel that could be working in the vicinity. Detail any discrepancies. 10. Download the Cellcorder to a PC and create a data file f...
Page 65 - Specifications
8 Specifications The overall system specifications can vary, depending upon the number of rectifier modules. Note that some specification items are provided on a “per rectifier” basis and must be combined or totaled for a give system configuration. 8.1. AC Input 1MRF28H54BV Rectifiers Nominal Input ...
Page 66 - Rectifiers
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 61 8.2. DC Output (with either 1MRF28H54BV Rectifiers and 1MRF28H54BV50 Rectifiers) Nominal Output Voltage (factory set) 54.5 VDC Operating Voltage Range 44 – 58 VDC Rated Output Current (per Rectifier) 50 A Rated Output Power (per Rectifier) ...
Page 67 - Power Shelf Control Unit
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 62 Float / Boost/Equalize Switch Used to Control voltage on systems without a PSCU Float Trim Pot The float pot is used to adjust the default float voltage (54.5 VDC). Boost/Equalize Trim Pot The boost/equalize pot is used to adjust the defaul...
Page 69 - APC Worldwide Customer Support
MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 64 9 APC Worldwide Customer Support Customer Support for this or any other APC product is available at no charge. You can contact APC Customer Support in any of the following ways: • Use an APC web page to find answers to frequently asked ques...
