Page 2 - Table of Contents; AC P
MX28B400 +24 VDC User’s Manual Page ii Table of Contents 1 SAFETY FIRST! .....................................................................................................................1 1.1. W ARNING S YMBOLS ........................................................................................
Page 4 - Revision History; Revision Date; BET; Table of Figures
MX28B400 +24 VDC User’s Manual Page iv Revision History Revision Date By Description 990-1809 Rev 1 02 MAR, 2004 BET Preliminary Release Table of Figures FIGURE 2.1-1 MX28B-400 +24 VDC POWER PLANT .............................................................................2 FIGURE 2.1-2 MX28B-400 +...
Page 5 - Safety
MX28B400 +24 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, equipment damage or misuse WA...
Page 6 - Introduction
MX28B400 +24 VDC User’s Manual Page 2 2 Introduction 2.1. General Information 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...
Page 9 - Installation; Section 7
MX28B400 +24 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. If concealed damage...
Page 10 - Ventilation; for environmental characteristics.] Free airflow; : Ensure that all of the external dc and ac circuit breakers are in; WARNING; : The MX28B power plant is supplied from a nominal 230Vac, 60
MX28B400 +24 VDC User’s Manual Page 6 Ventilation The rectifier modules for this system have fans that provide front-to-rear airflow for internal cooling. The MX28B housing should mounted such that there is free airflow to the front, top, and bottom of the unit. [Refer to Section 6.5 for environment...
Page 11 - : Hazardous energy levels are present on bare conductors in the; : Make certain that the battery polarity is correct when making
MX28B400 +24 VDC User’s Manual Page 7 3.4. Battery Connections WARNING : Hazardous energy levels are present on bare conductors in the +24Vdc distribution connection area of the plant. Accidental shorting of distribution conductors can cause arcing and high currents that can cause serious burns or o...
Page 12 - Battery Temperature Probe Installation
MX28B400 +24 VDC User’s Manual Page 8 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. ...
Page 16 - MX28B400 +24 VDC User’s Manual; Plug-in Circuit Breaker Installation; terminal board as the breaker is snapped into place.; when it is turned OFF.
MX28B400 +24 VDC User’s Manual Page 12 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) Remove the circuit breaker cover panel and the plastic cover(s) from...
Page 17 - front; of the return bus to prevent interfering
MX28B400 +24 VDC User’s Manual Page 13 Circuit Breaker Connections (1 to 50 Amps) Connections for 1 to 50 amp dc loads require standard two-hole lugs with holes for #10 screws on 5/8” centers and are located directly above the corresponding circuit breaker. The load returns connect to the return bus...
Page 18 - GMT Fuse Option; Monitoring and Relay Output Connections; Front Panel DB9 Connection
MX28B400 +24 VDC User’s Manual Page 14 The load returns connect to the return bus located just above and rearward of the breaker connection points as seen in Figure 2.1-1 . The return bus provides 24 sets of threaded #10-32 holes on 5/8” centers and four sets of threaded ¼-20 holes on ¾” centers for...
Page 19 - RJ45 Ethernet Connector; for Output Relay connections. The relay contacts should only be
MX28B400 +24 VDC User’s Manual Page 15 RJ45 Ethernet Connector The optional management card has an RJ-45 connector to support a TCP/IP protocol over a 10BaseT Ethernet Local Area Network (LAN). Relay Output Connections There are eight alarms available that provide outputs via Form “C” relay contacts...
Page 20 - RELAY; MINOR
MX28B400 +24 VDC User’s Manual Page 16 RELAY OUTPUT TERMINAL DESIGNATION NO-NC-C USER ALARM NOTES RELAY #1 RELAY #2 RELAY #3 RELAY #4 RELAY #5 RELAY #6 MINOR MAJOR 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 ________________________ _________________...
Page 22 - : The power plant is supplied from a nominal 220Vac, 50/60 Hz; ) Battery Float Voltage; for the batteries being used in the system.); ) Battery Maximum Recharge Rate
MX28B400 +24 VDC User’s Manual Page 18 4) Apply ac Power. Turn on the circuit breakers that supply ac power to the rectifiers in the MX28B power plant. The main screen should appear on the control unit display (see Figure 4.6-1). The display on the control unit is a 2-lines by 16-characters display....
Page 23 - OFF
MX28B400 +24 VDC User’s Manual Page 19 3.12. 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 power plant. Turn on the external circuit breaker from the battery to the power ...
Page 24 - Operation; DC Output Power
MX28B400 +24 VDC User’s Manual Page 20 4 Operation 4.1. Technical Description The MX28B-400 Power System is designed to supply safe +24 Vdc primary power through the use of up to four rectifier modules. In conjunction with an external battery string, it will supply backup power as well. The Power Sy...
Page 25 - System Voltage Control
MX28B400 +24 VDC User’s Manual Page 21 4.3. System Management System Output Capacity The MX28B-400 supplies a maximum of 400 amps or 300 amps with N+1 redundancy. The housing for this configuration provides space for two rectifier shelves that can hold up to four rectifiers each, a control unit, and...
Page 27 - Battery/Load Low Voltage Disconnect; LVD 1 Trip Voltage; Front Panel User Interface
MX28B400 +24 VDC User’s Manual Page 23 Battery/Load Low Voltage Disconnect In order to prevent damage to the battery due to deep discharge, the power system has hardware and software support for a battery or load Low Voltage Disconnect (LVD). A battery LVD has the loads permanently attached to the r...
Page 28 - Parameter Locations, Descriptions, and Default Values; . To find the parameters that can be
MX28B400 +24 VDC User’s Manual Page 24 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 (enter 2222 on the “PIN” screen) enable...
Page 29 - DESCRIPTION
MX28B400 +24 VDC User’s Manual Page 25 Parameter Locations, Descriptions, and Default Values PARAMETER NAME/ [MENU LOCATION] DESCRIPTION DISPLAY SCREENS / DEFAULT SETTINGS Address 1 Security Level {1} [SYSTEM/SETUP] Power plant address or identification - first line. Address 1 m+APC DCNS, Inc. Addre...
Page 38 - Control Unit Menu Structure
MX28B400 +24 VDC User’s Manual Page 34 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 title. T o p L e v e l...
Page 44 - Front Panel LED Indicators
MX28B400 +24 VDC User’s Manual Page 40 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 MX28B400 +24V + TT PIN OEM PIN MX28B400 +24V + IN OEM OEM R Offset • OEM R Gain • OEM C Offset • OEM C Gain • OEM S Offset • OEM S Gain Front Panel LED Indicators Major (Red) On whe...
Page 45 - Section; . For information on wiring
MX28B400 +24 VDC User’s Manual Page 41 4.7. Alarm Outputs (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 spec...
Page 46 - Remote
MX28B400 +24 VDC User’s Manual Page 42 5 Remote Monitoring 5.1. Description Remote monitoring and control of the dc power system is accomplished through the use of the optional APC Network Management card. This card is a separate module mounted into the top panel of the system controller module. Com...
Page 47 - Specifications
MX28B400 +24 VDC User’s Manual Page 43 6 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. 6.1. AC Inpu...
Page 48 - Rectifiers
MX28B400 +24 VDC User’s Manual Page 44 6.2. DC Output (with either Rectifier) Nominal Output Voltage (factory set) 27.2 Vdc Operating Voltage Range 22 – 29 Vdc Rated Output Current (per Rectifier) 100 A Rated Output Power (per Rectifier) 2800 W (45ºC) Efficiency 91% Typical 6.3. Controls and Indicat...
Page 49 - Power Shelf Control Unit
MX28B400 +24 VDC User’s Manual Page 45 +I Test Point Rectifier Current can be measured with a voltmeter between COM and +I. Current is 10A/V multiplied by test point voltage. Float / Boost/Equalize Switch Used to Control voltage on systems without a PSCU Float Trim Pot The float pot is used to adjus...
Page 51 - APC Worldwide Customer Support; Latin America
MX28B400 +24 VDC User’s Manual Page 47 7 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 questions (FAQs), to acce...
Page 52 - Limited
MX28B400 +24 VDC User’s Manual Page 48 8 Limited Product Warranty The limited warranty provided by American Power Conversion Corporation ("APC") in this Statement of Limited Factory Warranty applies only to Products Buyer purchases for your commercial or industrial use in the ordinary course...
