Assessments - 1, GPA: 3
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GENERAL ................................................................... 1 2. DESCRIPTION ............................................................ 1 3. INSTALLATION.......................................................... 2 4. SPECIFICATIONS....................................................... 4 5. MAINTENANCE......................................................... 4 6. WARRANTY AND CUSTOMER SERVICE .............. 4 Figures Figure 1. TA 750/850 PS/BC, Front and Back ................... 1 Figure 2. AC/DC Power Supply Battery Charger Layout .. 3 Figure 3. Alternate Mounting Arrangements ...................... 3 Tables Table 1. Alarm Relay Operation ........................................ 2 Table 2. LED Indication .................................................... 2 Table 3. Specifications....................................................... 4 1. GENERAL This practice provides installation and maintenance procedures for the ADTRAN™ Total Access 750/850 Power Supply/Battery Charger. Figure 1 is a front and back illustration of the PS/BC. Revision History This is the initial release of this document. Future revisions will be made in this subsection. Features The Total Access 750/850 PS/BC, P/N 1175043L2, features include the following: • Compact design. • Versatile mounting arrangements. • All mounting hardware included. • Built-in Fuse. • Multi-feature status LED. • Modular connections. • Positive ground. • Uninterrupted power output if battery backup connected. • FCC and UL 1950 compliant. GRN - OK YEL - DISCHARGING RED - LOW OFF - NOT CONNECTED GRN - OK YEL - FAIL RED - FAIL OFF - FAIL 1175043L2 AC BAT 1175043L2 3 AMP -54V , 2A OUTPUT 120 VAC/ 2A 60HZ INPUT THIS UNIT MAY BE POWERED BY 2 SOURCES. BOTH SOURCES BEFORE -48V , 2A INPUT AC ALARM OUTPUT 9902271 FUSEFUSE Figure 1. TA 750/850 PS/BC, Front and Back 2. DESCRIPTION The AC/DC Power Supply/Battery Charger provides -54 VDC to the Power Supply Unit in the TA 750/850 Chassis. The PS/BC receives 115 VAC through a standard plug and wall socket. The unit works in conjunction with an optional ADTRAN backup battery pack, P/N 1175044L1, L2, L3. In this arrangement, the PS/BC maintains the battery at peak charge of -54V. If AC power is lost, the unit automatically transfers power from the battery pack without interrupting service. When AC power returns, the unit switches back to AC power and recharges the battery to peak charge. This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2), this device must accept any interference that may cause undesired operation. Changes or modifications not expressly approved by ADTRAN could void the user’s authority to operate this equipment. Trademarks: Any brand names and product names included in this document are 61175043L2-5A trademarks, registered trademarks, or trade names of their respective holders. Alarm and Battery Disconnect Relays Two relays support Power Supply operation: • Alarm relay • Battery disconnect relay ALARM RELAYANDALARM SIGNAL The Alarm relay is provided for customer use. In normal operation the contact alarm relay is open. If an AC power failure occurs and the unit defaults to the battery backup, the relay will cycle open/closed once per second (that is one second open then one second closed). The tolerance on this cycle time is 25 percent. This indicates the battery is discharging in support of the load. If battery voltage decreases to 45V the relay stays closed to indicate the battery is becoming depleted. The relay will open automatically when normal AC voltage is restored. Table 1 summarizes alarm relay operation. Table 1. Alarm Relay Operation Condition Alarm Relay Normal Open AC Power Failure/Battery Backup engaged Cycles open/closed once per second Battery voltage is less than 40V Stays closed An alarm signal that cycles synchronously with the alarm relay is provided on the output cable. This signal, which is open during normal operation, cycles between open and ground during battery backup (as described for the alarm relay), and is ground when the battery voltage falls below 45V. BATTERYFAILALARM For battery backup systems that employ the optional Battery Test Assembly (P/N 1175044L3) an alarm signal is provided to the TA 750/850 L2 Power Supply that indicates a failed battery (in need of immediate replacement). This signal is passed to the Alarm Relay and Output Alarm Signal. When a failed battery is detected, it is indicated by the Alarm Relay cycling open for 450 ms, then closed for 450 ms. Battery failure is also indicated by the output alarm signal cycling open to ground at the same rate. BATTERYDISCONNECT RELAY The battery disconnect relay disconnects the battery pack from the system if the battery voltage falls below 40 VDC. This feature prevents damage to the batteries. The batteries will be recharged when normal AC voltage is restored and the relay will close when th...