American Power Conversion 250 A manual Alarm Beeper, Clearing latched alarms, Fuel Alarm Limits

Alarms

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 officially exists, the specified
	limit must be exceeded for this amount of time (in seconds). The advantage of the
	delay is that it filters out short alarm conditions, which are normal in ATS
	operation. For example, when utility power is shut off, the ATS will interpret this
	as a low-voltage condition; however, once the generator begins operation, this
	alarm is meaningless. An Alarm Delay of more than 15 seconds may prevent
	display of the low-voltage alarm in this example. The Alarm Delay applies to all
	Voltage, Loading, Frequency, and Runtime limits.

Alarm Beeper

Once the alarm beeper sounds, it will continue to beep every 30 seconds. Touching any button on the ATS display interface will de-activate the beeper. Use this menu option to turn Off the beeper so that it never sounds when an alarm occurs, or turn On the beeper after you have turned it off. The default is On.

Clearing latched alarms

When an alarm is present, the Alarm LED on the ATS display interface is lit red. To clear latched alarms, you must acknowledge them differently than other alarms. The following are considered 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 and turn off the LED, choose the Clr Latched Alarms option on the Alarm/Event Log menu of the Alarms screen. You can also clear latched alarms by resetting automatic operation on the ATS. Set the Automatic Operation switch to Disable () and then back to Enable ().

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44 InfraStruXure Power Generation System