Emax Low voltage air circuit-breakers - ABB Download Center

Automatic transfer switch ATS021 and ATS022512) Automatic transfer switch - ATS021 and ATS022The ATS (Automatic Transfer Switch) is the network-generator transfer unit used in installationswhere switching the main power line to an emergency one is required, to ensure power supplyto the loads in the case of anomalies in the main line.The unit is able to manage the entire transfer procedure automatically, and prepares the commandsfor carrying out the procedure manually as well.In the case of an anomaly in the main line voltage, in accordance with the parameters set by theuser, the opening of the circuit-breaker of the main line, the starting of the generator set (whenprovided) and the closing of the emergency line are performed. In the same way, in the case ofthe main line returning, the procedure of reverse transfer is controlled automatically.The new generation of ATS (ATS021 and ATS022) offers the most advanced and completesolutions to guarantee service continuity. The ATS021 and ATS022 can be used both with all thecircuit-breakers in the SACE Tmax XT family and with the switch-disconnectors.The ATS021 and ATS022 devices have been designed to operate with self-supply. The ATS022unit also prepares the connection for auxiliary power supply, which allows additional functionsto be used.The ATS021 and ATS022 devices carry out control of both the power supply lines and analyse:• phase unbalance;• frequency unbalance;• phase loss.Apart from the standard control functions, with the ATS022 unit, the following is possible:• selecting the priority line;• controlling a third circuit-breaker;• incorporating the device in a supervision system with Modbus communication (auxiliarypower supply is needed);• reading and setting the parameters, and displaying the measurements and alarms, by meansof a graphic display.Typical applications for use are: power supply to UPS (Uninterrupted Power Supply) units,operating rooms and primary hospital services, emergency power supply for civil buildings,airports, hotels, data banks and telecommunication systems, power supply of industrial lines forcontinuous processes.For correct configuration, each circuit-breaker connected to the ATS021 or ATS022 must befitted with the following accessories:• mechanical interlock;• motorised control of opening and closing;• key lock against just manual operation for the motor operator;• contact for signalling the state (open/closed) and contact for tripped;• contact for racked-in (in the case of a withdrawable version circuit-breaker).5/22ABB SACE