APC AP9606 Specifications download pdf (Page 29)

Chapter 2. APC hardware and software background 21

• Comm Lost While On Battery

Communication with the UPS has been lost while the UPS is on battery. The

event may be caused by a loose communication cable or, rarely, by a software

conflict, such as an application inadvertently blocking PowerChute PLUS from

monitoring the serial port while the UPS is on battery.

RECOMMENDED ACTION: Run the command file UPS.CMD to either move

or set the Cluster Groups offline. This script is described in Chapter 4, “The

command file UPS.CMD” on page 67.

• PowerChute PLUS Started

PowerChute PLUS UPS monitoring has been started.

RECOMMENDED ACTION: None. After a shutdown, the cluster should be

brought back online manually by the Administrator.

• UPS Battery Is Discharged

The UPS is online, but its battery capacity is low. If power fails, PowerChute

PLUS shuts down the system immediately.

RECOMMENDED ACTION: Immediately notify the cluster administrator. Use

the notify function that was implemented in PowerChute PLUS.

• Lost Communication With UPS

PowerChute PLUS attempts to establish communication with the UPS and

fails, or communication that was established is lost.

RECOMMENDED ACTION: Immediately notify the cluster administrator. Use

the notify function that was implemented in PowerChute PLUS.

• UPS Output Overload

For an APC UPS, the equipment load on the UPS exceeds its rated load

capacity. Reduce the load by unplugging some equipment from the UPS, and

run a self-test.

A Smart-UPS will sound an alarm when loads greater than 107% of its rating

are applied for more than approximately four seconds. Sustained overloads

greater in amplitude than 107% may cause the UPS's input circuit breaker to

trip, depending on the level of overload and its duration. In this case, the UPS

will shut down and not attempt to transfer to battery power in order to protect

its internal circuitry. Note: an overload is detected and indicated independent

of line voltage at 107% of full rated load for all models.

When operating on-battery, the UPS will not attempt to support steady-state

overloads and will shut down after approximately two to five seconds of their

application. However, transient overloads applied while on-battery and lasting

less than one second will be supported up to 150% of the UPS's load rating. In

this case, the output voltage may not be within the specified regulation limits.

The likelihood of the UPS shutting down while operating on-battery due to

transient overload above this rating is increased as the battery becomes

discharged during an extended power outage.

RECOMMENDED ACTION: Immediately notify the cluster administrator.

• Battery Needs Replacing

One or more UPS batteries are heavily discharged and can no longer hold a

full charge. If utility power fails during this condition, an APC runs for less than

half its normal run time.

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APC AP9606 Specifications Page 29

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