Operating instructions

TransTel Model TD-824-I Digital Telephone System – System Installation
Page 29
Preparing The External Battery Backup
The Key Service Unit can have two external
backup batteries in series (12 volts each) for
emergency power and when a power failure
takes place.
If you are installing an optional Battery Backup
(SK-BCAB/B), make certain that there is
adequate room for its installation. Make certain
that the Battery Backup is mounted close
enough to the Power Supply that the
interconnecting cable between the Battery
Backup and the Power Supply can connect.
Do Not Connect the Battery Backup at this time!
Do Not Connect the Battery Backup at this time! Battery Backup should not be connected to the
System power supply until all power up testing has been completed!
Charging the Battery
The rechargeable batteries are automatically charged when the KSU is plugged in.
When System is in a full-load condition (eight CO trunks and twenty four extensions all in use), the batteries provide
a minimum of 1 hour's continuous use. Change the batteries every two years.
Installing or Replacing Batteries
Caution
To Reduce the Risk of Fire or Injury to persons, Read and Follow these Instructions.
1. Use only the following type and size batteries:
12 Volt 6.5 Amp/Hour "Gel-Cell" sealed batteries (2).
Dimensions, approximately 3 1/4" (H), 5 15/16" (W), 2 1/2" (D).
PowerSonic model PS660 or equivalent.
2. Do not dispose of the batteries in a fire. The cell may explode. Check with local codes
for possible special disposal instructions.
3. Do not open or mutilate the batteries. Released electrolyte is corrosive and may cause
damage to the eyes or skin. It may be toxic if swallowed.
4. Exercise care in handling batteries in order not to short the battery with conducting
materials such as rings, bracelets, and keys. The battery or conductor may overheat and cause burns.
This product is defined as a secondary battery operated device. As such, the following instructions should
also be read and followed:
1. Charge the batteries provided with or identified for use with this product only in accordance with the instructions
and limitations specified in this manual.
2. Observe proper polarity orientation between the batteries and battery charger.
3. Do not mix old and new batteries in this product.
5. Do not mix batteries of different sizes or from different manufacturers in this product.
Before installing or replacing batteries, disconnect the battery supply unit to the KSU by removing the polarized
battery connector at the KSU. Due to the weight of the batteries, it is advised that the battery cabinet be removed
from the wall before working on it.