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MX28B1200/2400
MX28B1200/4800
-48 VDC POWER SYSTEMS
User’s Manual
(Document # 990-1148A)
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Table of Contents 1 SAFETY FIRST!.....................................................................................................................1 1.1. WARNING SYMBOLS .........................................................................................................1 1.2. GENERAL PRECAUTIONS:..................................................................................................1 2 INTRODUCTION ........................................................................
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3.10. EXTERNAL ALARM INPUT CONNECTIONS ..........................................................................25 3.11. RECTIFIER MODULE INSTALLATION...................................................................................26 4 COMMISSIONING AND PREVENTIVE MAINTENANCE ....................................................27 4.1. PRE-COMMISSIONING INSPECTION...................................................................................27 Environment...............................
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6.3. COMMAND AND MONITORING PROTOCOL .........................................................................54 7 PREVENTIVE MAINTENANCE............................................................................................55 7.1. EQUIPMENT ...................................................................................................................55 7.2. INSPECTION ...................................................................................................................5
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Revision History Revision Date By Description 1 31 JAN, 2002 JNF Converted to APC numbering 2 28 SEP, 2003 BET Updated Format and added 4800 Table of Figures FIGURE 2.2-1 MX28B-1200 –48 VDC POWER PLANT RECTIFIER BAY.............................................3 FIGURE 2.2-2 MX28B BLOCK DIAGRAM ...............................................................................................4 FIGURE 3.2-1 FLOOR MOUNTING DIMENSIONS ............................................
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1 Safety First! It is very important to follow all safety procedures when unpacking, installing and operating any sort of power equipment. 1.1. Warning Symbols CAUTION: An indication that special care is required to prevent injury, equipment damage or misuse WARNING: An indication of an electrical hazard that may cause serious personal injury or death, catastrophic equipment damage or site destruction. 1.2. General Precautions: WARNING: The DC power plant is supplie
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2 Introduction 2.1. General Information DC Power Plants from APC have unique features that make them easy to install, maintain, and upgrade. The rectifier units are modular and truly “hot-pluggable” into the shelf assembly without any separate AC wiring. All system settings are made from the system control unit that provides monitoring and control functions for each component of the system as well as alarm listings for system diagnosis and maintenance. The APC Model MX28B is a mod
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Figure 2.2-1 MX28B-1200 –48 VDC Power Plant Rectifier Bay MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 3
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Figure 2.2-2 MX28B Block Diagram MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 4
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3 Installation 3.1. Unpacking Equipment Remove equipment from packing material and inspect for shipping damage or missing items. It is important to report damage or material shortages to the shipping carrier while a representative is on site. If concealed damage or material shortages are found at a later time, contact the shipper to make arrangements for inspection and claim filing. Refer to Section 7 in the event it is necessary to return equipment to APC. CAUTION: Approp
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Mounting The box frame housing the MX28B components is self-supporting, but designed to be bolted to the floor of the housing structure. Figure 3.2-1 shows the footprint of the box frame and the mounting points with dimensions (shown in inches). Consult the system design specifications to see if it is necessary to electrically isolate the frame from the floor structure. This is required in many installations. Figure 3.2-1 Floor Mounting Dimensions Systems with multiple box fram
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Figure 3.2-2 MX28B-1200-2400 has a maximum Figure 3.2-3 The MX28B1200-4800 can be capacity of 2400 Amps. expanded to 4800 Amps. Figure 3.2-4 Splice Plate Installation MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 7
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Circuit Breaker/LVD Ribbon Cable Connections Additional cables must be connected between cabinets to ensure that the circuit breaker alarms in the expansion bays are reported correctly. The circuit breakers and LVDs are connected together through the use of a Circuit Breaker / LVD Expansion Board. The ribbon cables on the left hand side of the board go to the bay to the left. The ribbon cables on the right hand side of the board go to the bay to the right. If there is an open Alarm Con
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Fuse Alarm Ribbon Cable Connections There is a 16-conductor ribbon cable, if any bay has fuses installed. This cable ties together the Wago breakout board in each bay with fuses. The ribbon cable must connect all the Wago breakout boards together with one ribbon cable. The idea is that each fuse will have one wire in the ribbon cable for the alarm. Two fuse alarm wires should not be connected to the same fuse. See Figure 3.2-6 for details. Ribbon cable pin 1 is for Fuse 1. Ribbon c
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input. The AC wiring, from the AC input terminal block connections to the hot-pluggable AC input connector for each rectifier, is factory installed. The AC input enclosure, located at the top rear of the MX28B rectifier bay, is provided with nine ¼ -inch pilot holes in the top plate. Remove the ac input enclosure from the box frame in order to punch or drill the appropriate number of conduit openings for the conduit size(s) desired. Do not leave the ac input enclosure in place when pun
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If the AC input power is provided from a three-phase distribution panel, the circuit breaker positions should be selected such that the load is balanced as much as possible. WARNING: The MX28B DC power plant is supplied from a high voltage source. Keep the AC input enclosure in place when the system is operational or energized. 3.4. Battery Connections WARNING: Hazardous energy levels are present on bare conductors in the - 48VDC distribution connection area of the plant. Acc
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Connecting the Battery Cables WARNING: Make certain that the battery polarity is correct when making connections to the Model MX28B DC power plant. Incorrect connection could cause severe equipment damage. The battery cable connections are located at the top rear of the unit as shown in Figure 3.4-1. The battery positive (return bus) and battery negative (-48V bus) buses each provide four sets of 3/8” holes on one-inch or 1-3/4” centers for connecting two-hole battery cable lugs
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Battery Temperature Probe Installation The optional temperature probe is used to monitor the battery string temperature. To get the most representative temperature measurement, the probe should be placed in contact with a battery cell that is centrally located. The probe should be placed directly in contact with the cell (not the frame surrounding the cell). Generally, the cell cover can be used; be careful not to allow the probe body to touch the terminals. Remove the adhesive protect
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Figure 3.5-1 DC System Grounding Figure 3.5-2 Box Frame Ground 3.6. DC Power Output Over-Current Protection There are several different options for DC output power distribution. Distribution provides a convenient method of connecting the load cables as well as over-current protection. DC Plug-in Circuit Breakers A standard 48-position plug-in circuit breaker tier provides -48V distribution. Various circuit breaker sizes from 1 to 100 amps are available, with 60-100 amp brea
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the Wago connectors based on what bay the circuit breaker tiers are in. Typical circuit breaker numbering is bay 1: Cir Bkr 1-48, Bay 2: Cir Bkr 49-50, Bay 3: Cir Bkr 51-52 and Bay 4: Cir Bkr 53-54. Figure 3.6-1 shows the power plant’s main bay (with ribbon cables) DC distribution section with the front cover opened. Figure 3.6-1 DC Distribution (Front Cover Opened) Available plug-in circuit breakers are shown in Figure 3.6-2. These are only breakers and do not include any hardwa
