Technical information

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ATS021
ATS022
1SDC210033D0202
The ATS (Automatic Transfer Switch) is the network-generator transfer unit used in installations
where switching the main power line to an emergency one is required, to ensure power supply to
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 commands
for 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 the
user, the opening of the circuit-breaker of the main line, the starting of the generator set (when pro-
vided) and the closing of the emergency line are performed. In the same way, in the case of the main
line returning, the procedure of reverse transfer is controlled automatically.
The new generation of ATS (ATS021 and ATS022) offers the most advanced and complete solu-
tions to guarantee service continuity. The ATS021 and ATS022 can be used both with all the circuit-
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 ATS022
unit also prepares the connection for auxiliary power supply, which allows additional functions to
be used.
The ATS021 and ATS022 devices carry out control of both the power supply lines and analyse:
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phase unbalance;
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frequency unbalance;
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phase loss.
Apart from the standard control functions, with the ATS022 unit, the following is possible:
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selecting the priority line;
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controlling a third circuit-breaker;
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incorporating the device in a supervision system with Modbus communication (auxiliary power
supply is needed);
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reading and setting the parameters, and displaying the measurements and alarms, by means of
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 for continuous proc-
esses.
For correct configuration, each circuit-breaker connected to the ATS021 or ATS022 must be fitted
with the following accessories:
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mechanical interlock;
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motorised control of opening and closing;
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key lock against just manual operation for the motor operator;
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contact for signalling the state (open/closed) and contact for tripped;
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contact for racked-in (in the case of a withdrawable version circuit-breaker).
Accessories
Automatic network-generator transfer unit ATS021-ATS022