ADTRAN Total Access 750 User Manual

Section 61175043L2-5A

Issue 1, June 2000

CLEI Code # SIMPAADA _ _

T otal Access

AC/DC Power Supply and Battery Charger

Installation and Maintenance

1. 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

™

750/850

GRN - OK

YEL - DISCHARGING

YEL - FAIL

RED - FAIL

OFF - NOT CONNECTED

OFF - FAIL

AC BAT

THIS UNIT MAY BE

SERVICING.

3 AMP

GRN - OK

RED - LOW

120 VAC/

2A 60HZ INPUT

-48V , 2A INPUT

1175043L2

9902271

AC ALARM

OUTPUT

-54V ,

2A OUTPUT

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.

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 trademarks, registered trademarks, or trade names of their respective holders.

1Section 61175043L2-5, Issue 161175043L2-5A

C A U T I O N

Alarm and Battery Disconnect Relays

Two relays support Power Supply operation:

• Alarm relay

• Battery disconnect relay

ALARM RELAY AND ALARM 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

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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.

batteries. The batteries will be recharged when normal AC voltage is restored and the relay will close when the battery voltage exceeds 40V.

Certain alarm features on the power supply are still powered by the battery after the disconnect relay is opened. These features slowly drain the battery. If it is known that AC power will be unavailable for an extended period (greater than a week), ADTRAN recommends that the battery be disconnected from the power supply to prevent over-discharge.

The batteries used in ADTRAN’s battery backup system are designed to withstand occasional over-discharge. While it is not recommended, the batteries can recover their full capacity under normal charging conditions, even when they have been subjected to extreme over-discharge.

Fuse

A 3-amp fuse on the back panel protects the unit from over current. The fuse isolates the AC input from the power supply in the event of a fault. The fuse is replaced by twisting the black cap to the left and pulling the fuse out. After the new fuse is inserted, the cap is pushed back in and turned to the right.

Status LED

A single multi-feature LED on the front panel provides AC operation or battery operation power status. Refer to Table 2 for indication descriptions.

Table 2. LED Indication

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BATTERY FAIL ALARM

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.

BATTERY DISCONNECT 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

2 Section 61175043L2-5, Issue 1 61175043L2-5A

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3. INSTALLATION

C A U T I O N

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

After unpacking the unit, inspect it for damage. If damage is noted, file a claim with the carrier then notify ADTRAN Customer Service.

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