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All equipment necessary for operation of the control and monitoring system shall be fed from the UPS system including the following: 

• The operator station including all connected equipment 

• The maintenance station including all connected equipment 

• The PLC's 

• The Server System, 

• The communication network 

• The instrumentation. 

• The fire detection system 

The UPS system for the treatment plant shall fulfil the following requirements: 

• Efficiency AC/AC: min 90% 

• Overload, 1 min.: 150% 

• Disturbance: <10% 

• Power factor: >0.9 

• EMC: VDE 871-B/0875-E 

• Acoustical noise: max. 55dBA. 

It shall include indication of: 

• Power source (grid or battery) 

• Charging 

• Battery OK 

• Inverter OK 

• Charger OK 

