APC Automatic Disconnect Switch Specifications download pdf (Page 54)

Display Interface: Alarms

44 Automatic Transfer Switch with Power Distribution

Alarm Beeper

Clearing latched alarms

When an alarm is present, the ATS display interface Alarm LED is red. To clear latched alarms, you must

acknowledge them differently than all other alarms. The following are latched alarms:

• Test Complete-Failed: The system has failed a self-test.

• Gen Start Failure: The generator failed to start.

To clear a latched alarm, choose the Clr Latched Alarms option on the Alarm/Event Log menu of the

Alarms screen to turn the LED off. You can also clear latched alarms by resetting automatic operation on the

ATS. To reset automatic operation on the ATS, set the Automatic Operation switch to Disable (



) and then

back to Enable (

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Fuel Alarm Limits Low Fuel Alarms:

• Percent Fill: If the amount of fuel as a percentage falls below this value, an alarm

condition exists. See “Fuel monitoring/runtime calculation” on page 9 for more

information.

• Runtime: If the estimated runtime falls below this value, an alarm condition

exists. See “Fuel monitoring/runtime calculation” on page 9 for more information.

Other Limits Other Limits:

• Frequency: If the frequency is outside this range, an alarm condition exists.

• Alarm Delay: Before an output alarm condition exists, a limit must be exceeded

for this amount of time (in seconds). The advantage of the delay is that it filters

short alarm conditions, which are normal in ATS operation. For example, when

utility mains power is shut off, the ATS will have a low voltage condition;

however, once the generator begins operation, this alarm is meaningless. An

Alarm Delay of more than 15 seconds may prevent the display of the low voltage

alarm in this example. The Alarm Delay applies to all Voltage, Loading,

Frequency, and Runtime limits.

When the alarm beeper is sounding, it will do so every 30 seconds, and touching any key on the ATS display

interface will de-activate it. Use this menu option to turn the beeper off so that it never sounds when an alarm

occurs, or turn the beeper on again. The default is On.

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APC Automatic Disconnect Switch Specifications Page 54