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6.
Input and output signals
6. Input and output signals
6.1 Output signals
DO1, DO2, DO3, DO4: Circuit breakers opening/closing command
Output signals DO1...DO4 control the opening and closing of circuit breakers CB1 and CB2 connected
to ATS021.
The control logic integrated in the device punctually checks the correct operation of the circuit breakers
following the command.
If the change in status of the circuit breaker is not received within 5 seconds of sending the command,
the device considers the command as failed and operates as below:
• alarm LED lights up.
• DO6 alarm output activation
To reset the alarm press the RESET button.
DO5 Emergency generator start/stop command
Start and stop of the Emergency generator are controlled by means of a bistable relay, making it possible
to maintain the generator even when the powersave mode runs out.
• contact DO5 (X23:1 ; X23:2 - NO):
- stop unit = contact open
- start unit = contact closed
• contact DO5 (X23:2 ; X23:3 - NC):
- stop unit = contact closed
- start unit = contact open
DO6 Alarm signal
When an alarm is generated, the DO6 contact switches; the switching logic is disabled.
To reset the alarm press the RESET button.
If there is no power in both lines the alarm signalling contact DO6 is activated.
• contact DO6 (X24:1 ; X24:2 - NO):
- Alarm = contact open
- Normal operation = contact closed
• contact DO6 (X24:2 ; X24:3 - NC):
- Alarm = contact closed
- Normal operation= contact open
DO7 Manual mode signalling
Contact DO7 provides the indication of the operating mode of the ATS021 unit (X25:2 - contact closed if
the unit is in manual mode and open if in automatic mode)
DO8 Logic enabled indication
Contact DO8 provides the indication of the operating mode of the ATS021 unit (X25:3 – contact open if
the unit operates with the logic enabled; contact closed if the unit operates with the logic disabled).
1SDH000759R0002
Installation and operating instructions, ATS021
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