Page 197 - SACE Tmax XT - Catalogue

ACCESSORIES 7/51

Automatic network-generator transfer unit ATS021-ATS022
The ATS (Automatic Transfer Switch) is a network-generator transfer unit used in installations where
switching the main power line to an emergency line is required to ensure power supply to the loads in
case of anomalies in the main line.
The unit is able to manage the entire transfer procedure automatically and prepares the commands for
carrying out the procedure manually as well.
In the case of an anomaly in the main line voltage, in accordance with parameters set by the user, the
opening of the circuit-breaker of the main line, the starting of the generator set (when provided) and
— the closing of the emergency line can be carried out. In the same way, when the line is supplied back,
ATS021
the procedure of reverse transfer is controlled automatically.
The new generation of the ATS (ATS021 and ATS022) offers the most advanced and complete solutions
to guarantee service continuity. The ATS021 and ATS022 can be used with all the circuit-breakers as well
as the switch-disconnectors of the SACE Tmax XT family. The ATS021 and ATS022 devices have been de-
signed to operate with a self-supply. The ATS022 unit also prepares the connection for the auxiliary
power supply, which allows additional functions to be used.
The ATS021 and ATS022 devices carry out the control of both the power supply lines and analyze:
• phase unbalance;
— • frequency unbalance;
ATS022
• phase loss.
Apart from the standard control functions, the ATS022 enables the following operations:
• selection of the priority line;
• control of a third circuit-breaker;
• integration of the device in a supervision system with Modbus communication (an auxiliary power
supply is needed);
• reading and setting parameters, and displaying measurements and alarms, by means of a graphic 07
display.
Typical applications include: power supply to UPS (Uninterrupted Power Supply) units, operating the-
aters and primary hospital services, emergency power supplies for civil buildings, airports, hotels, data
banks and telecommunication systems, and the power supply of industrial lines for continuous pro-
cesses.
For the correct configuration, each circuit-breaker connected to the ATS021 or ATS022 must be fitted
with the following accessories:
• a mechanical interlock;
• a motorized control for opening and closing;
• a key lock against manual operation for the motor operator;
• a signaling contact for the status (open/closed) and a signaling contact for tripping;
• a contact for the racked-in position (in the case of a withdrawable version circuit-breaker).