Filter
Top Products
4 Issue 1, January 2004 61175043L3-5A
P/N 1200657L2) that has a molded modular connector on one
end and four soldered wire tips on the other (see Figure 3).
Figure 3. Cable for the MX2800
Connect the soldered ends of the wires to the modular con-
nector that fits into the chosen power bus using a small slotted
screwdriver. (The power buses are labeled A and B on the
rear 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 the
chassis on the desired power bus (A or B). Connect the other
end to the DC wiring harness of the PSU wiring harness and
plug the AC plug into the AC power source.
Battery Backup Units
Mounting
When using the PS/BC in conjunction with available
ADTRAN Battery Backup Units (BBUs), one of the
following mounting options should be used:
• Wallmounting the PS/BC (refer to Wallmounting on
page 2).
• Mounting the PS/BC to the product chassis containing
the DC power supply.
• Mounting the PS/C to the BBU.
Refer to your specific ADTRAN product system
documentation to determine the optimal mounting solution
for your system.
GROUNDING INSTRUCTIONS
For complete details on product grounding requirements, re-
fer to the Network Turnup Procedure in your product System
Manual.
The ground connector on the PS/BC provides an additional
ground reference (the third prong of the AC plug is also
grounded) and may be connected to the “ground bus” or
“ground wire” in a customer equipment room. 18 AWG or
larger ground wire is recommended.
4. BATTERY BACKUP OPERATION
The following information is applicable when using the
PS/BC with any available ADTRAN BBU.
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 op-
eration 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 45 V the relay stays
closed to indicate the battery is becoming depleted. The relay
will open automatically when normal AC voltage is restored.
Table 3 summarizes the alarm relay operation.
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.
Battery Fail Alarm
For battery backup systems that employ the optional Battery
Test Assembly an alarm signal is provided to the PS/BC 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 tot he batteries. The batteries
Left WHITE Battery Backup Alarm Wire
RED Negative Terminal Wire
BLACK Positive (RET) Wire
Right GREEN Ground Terminal Wire
GR-1089-CORE Requirement
An equipment grounding conductor that is not smaller
in size than the ungrounded branch-circuit supply
conductor is to be installed as part of the circuit that
supplies the product or system.
Table 3. 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