1. UPS Application
Alcad: UPS Application

2. (Uninterruptible Power Supply System)
UPS Application
UPS System
(Uninterruptible Power Supply System)
Rectifier supplies full inverter input power under normal conditions
Additional rectifier capacity to recharge battery
Battery supplies power to inverter in emergency
Inverter provides ac power to critical loads
Rectifier
Inverter ~ = = ~
Battery 2

3. UPS: Application requirements
High reliability
Life exceeding that of the UPS
High performance
Low maintenance
Abuse resistance
High ripple tolerance
Ability to accept high recharge currents
Good cycling capability (depending on location) 3

4. UPS: Ni-Cd Characteristics
Very high-rate performance
Thin plates with large surface area
Substantial steel conducting hardware
20-25 year service life
No corrosion of plate structure
Service life unaffected by plate thickness
Simple and infrequent maintenance
Mechanically and electrically rugged
Unaffected by ripple
Can be recharged at very high currents
Excellent cycling capability 4

5. UPS: Ni-Cd benefits Ni-Cd offers complete reliability
No sudden failure
No possibility of thermal runaway, as with VRLA
Ni-Cd capability degrades slowly and predictably
No frequent battery replacements
Ni-Cd life is typically longer than that of the UPS
Ni-Cd is relatively unaffected by cycling
High reliability and low operating costs make Ni-Cd highly cost effective 5

6. UPS: Ni-Cd products XHP range Vantex range Sintered positives
Maintenance-free(*) L and M types
Capacity range: 8 Ah to 1700 Ah
Long life, reliable operation to as high as + 40°C (+104°F)
Can be stored up to 2 years
XHP range
Sintered positives
Plastic bonded electrode (PBE) negatives
Capacity range: 11 Ah to 320 Ah
Long watering interval
Small footprint
(*) The term maintenance-free means that no addition of water is necessary during the lifetime of the product, when following Alcad’c recommended operating conditions. 6

7. UPS: Summary
UPS systems back up highly critical loads and MUST operate in an emergency
Ni-Cd is the only battery type that does not exhibit sudden failure
Factors that cause failure in lead-acid batteries, such as cycling and ripple, have little or no effect on Ni-Cd
Ni-Cd offers truly reliable, trouble-free service 7

8. Industrial Nickel-Cadmium batteries
A global capability
Industrial Nickel-Cadmium batteries 8