PS-RACK-12/100
Power supplies
The PS-RACK  series of battery chargers (24 Vdc) are intended for a Voice Alarm System. The battery chargers are microprocessor based devices that have been designed to charge lead-acid batteries (back-up batteries connected to the Voice Alarm System) and, simultaneously, to provide power to auxiliary devices such as the DIVA8 and IDA8 system controllers
 
The PS-RACK  battery chargers, which are fully compliant with EN54-4, offers a maximum charge current of 6 or 12 A. The battery charger is two rack units high, and has to be installed in a 19” rack. Maximum battery capacity: 225 AH.
 
1. Determine the standby current of the system. This information is available in the voice alarm system manual.
2. Multiply the standby current by the standby time that the local standards call for. Typically this is 24 hours.
3. Compare this value to the 24 hour discharge capacity of the battery.
4. Determine the evacuation current of the system. This information is available in the voice alarm system manual.
5. Multiply the evacuation current by the time that the local standards call for. Typically this is one hour or 30 minutes.
6. Compare this value to the 30 minute or 60 minute hour discharge capacity of the battery.