Led Indicators - ABB ATS021 Installation And Operating Instructions Manual

Installation and operating instructions, ATS021

5.2 LED indicators

Alarm
The steady red Alarm LED, see Figure 5.1/11, may indicate one of the following events:
• generic alarm
• logic disabling from input DI3
The alarm LED switches Off indicating that the switching logic is enabled and no alarms are present
Auto
The Auto LED, see Figure 5.1/10, indicates the operating mode:
• manual: LED Off
• automatic: steady green LED
• test: flashing green LED
Power
The Power LED, see Figure 5.1/9, indicates the presence of power supply:
• power supply present: steady green LED indicates power supply from line voltage
• no power supply: LED Off indicates that both lines are not present and that the Powersave condition
has ended. The switching logic is in stand-by for return of one of the line voltages
• Powersave: green flashing LED indicates, if both lines are absent, that the device is active and is in
stand-by for return of one of the line voltages (maximum duration 1 minute). When the Powersave
period ends, the LED switches off and the device awaits a line voltage. The moment the normal or
the emergency line is restored, with ATS021 in automatic, the unit analyses the conditions of the
lines monitored and the status of the circuit breakers and proceeds with the switching operation
in accordance with the situation concerned. If power is absent in both lines, the alarms signalling
contact is activated.
LN1 – LN2
The status of lines LN1 and LN2 is signalled by means of the red LEDs LN1 and LN2, see Figure 5.1/5 –
5.1/6; the status of the lines is expressed in the Table shown below.
Line status
Power OK
No power
Maximum voltage
Minimum voltage
Frequency not valid
Imbalance
Table 5.2: Indications of status of lines LN1 - LN2
2
5.
LED indication
ON
OFF
Rapid flashing (5 Hz)
Flashing (1 Hz, 50% ON / 50% OFF)
Flashing (1 Hz, 90% ON / 10% OFF)
Flashing (1 Hz, 10% ON / 90% OFF)
14
Using the automatic transfer switch