ADTRAN NIU3 Installation And Maintenance Manual
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4 Issue 1, January 2004 61175043L3-5AP/N 1200657L2) that has a molded modular connector on oneend and four soldered wire tips on the other (see Figure 3).Figure 3. Cable for the MX2800Connect the soldered ends of the wires to the modular con-nector that fits into the chosen power bus using a small slottedscrewdriver. (The power buses are labeled A and B on therear of the chassis.) Use the following wiring conventions(holding the connector as it will be inserted in the chassis):Secure the ends of the wires and plug the connector into thechassis on the desired power bus (A or B). Connect the otherend to the DC wiring harness of the PSU wiring harness andplug the AC plug into the AC power source.Battery Backup UnitsMountingWhen using the PS/BC in conjunction with availableADTRAN Battery Backup Units (BBUs), one of thefollowing mounting options should be used:• Wallmounting the PS/BC (refer to Wallmounting onpage 2).• Mounting the PS/BC to the product chassis containingthe DC power supply.• Mounting the PS/C to the BBU.Refer to your specific ADTRAN product systemdocumentation to determine the optimal mounting solutionfor your system.GROUNDING INSTRUCTIONSFor complete details on product grounding requirements, re-fer to the Network Turnup Procedure in your product SystemManual.The ground connector on the PS/BC provides an additionalground reference (the third prong of the AC plug is alsogrounded) and may be connected to the “ground bus” or“ground wire” in a customer equipment room. 18 AWG orlarger ground wire is recommended.4. BATTERY BACKUP OPERATIONThe following information is applicable when using thePS/BC with any available ADTRAN BBU.Alarm and Battery Disconnect RelaysTwo relays support Power Supply operation:• Alarm relay• Battery disconnect relayAlarm Relay and Alarm SignalThe Alarm relay is provided for customer use. In normal op-eration the contact alarm relay is open. If an AC power failureoccurs and the unit defaults to the battery backup, the relaywill cycle open.closed once per second (that is one secondopen then one second closed). The tolerance on this cycletime is 25 percent.This indicates the battery is discharging in support of theload. If battery voltage decreases to 45 V the relay staysclosed to indicate the battery is becoming depleted. The relaywill open automatically when normal AC voltage is restored.Table 3 summarizes the alarm relay operation.An alarm signal that cycles synchronously with the alarmrelay is provided on the output cable. This signal, which isopen during normal operation, cycles between open andground during battery backup (as described for the alarmrelay), and is ground when the battery voltage falls below45V.Battery Fail AlarmFor battery backup systems that employ the optional BatteryTest Assembly an alarm signal is provided to the PS/BC thatindicates a failed battery (in need of immediate replacement).This signal is passed to the Alarm Relay and Output AlarmSignal. When a failed battery is detected, it is indicated by theAlarm Relay cycling open for 450 ms, then closed for 450 ms.Battery failure is also indicated by the output alarm signalcycling open to ground at the same rate.Battery Disconnect RelayThe battery disconnect relay disconnects the battery packfrom the system if the battery voltage falls below 40 VDC.This feature prevents damage tot he batteries. The batteriesLeft WHITE Battery Backup Alarm WireRED Negative Terminal WireBLACK Positive (RET) WireRight GREEN Ground Terminal WireGR-1089-CORE RequirementAn equipment grounding conductor that is not smallerin size than the ungrounded branch-circuit supplyconductor is to be installed as part of the circuit thatsupplies the product or system.Table 3. Alarm Relay OperationCondition Alarm RelayNormal OpenAC Power Failure/BatteryBackup engagedCycles open/closedonce per secondBattery voltage is less than40VStays closed |
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