APC AP9225 User's Guide download pdf (Page 18)

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How MasterSwitchplus Works

Graceful Shutdown Sequence for Environment Alarms

Power On Delay†

Remain Off Delay

Outlet is turned on

Environmental Monitor asserts alarm

Environmental Monitor clears alarm

Server confirms shutdown

Power Off Delay† expires

Outlet is turned off

UPS is operating on AC power

UPS exceeds Battery Capacity Threshold†

YouissueBatteryCapacityThresholdOverridecommand

Outlet remains off

Youissuea

Cancel

command

Power On

Delay expires

Is there a cable connected to the Basic Port?

Ye s

Device Confirm†

Ye s N o

Does the configuration contain a UPS?

No Yes

MasterSwitch plus asserts

AC Fail and Low Battery signals

Is the alarm still active?

Ye s N o

Alarm Action Delay† expires

This diagram sequences the events

that an outlet set to Graceful Shutdown

will follow when your Environmental

Monitor issues an alarm. The

sequence is an unattended operation

that requires you to choose values for

the following properties:

• Alarm Action Delay

• Device Confirm

• Power Off Delay

• Battery Capacity Threshold

• Power On Delay

Unit Property‡

Outlet Property†

Shutdown

Restart

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APC AP9225 User's Guide Page 18

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