Delta AP300 Specifications download pdf (Page 64)

58 Operation

3.11 Alarm Messages

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Table 8 Alarm Messages

Alarm

Message

Meaning and

Corrective Action in Brackets [ ]

AC INPUT

Input power out of tolerance Frequency or voltage of the input power is outside the acceptable range. The

battery supplies power to the critical load through the UPS Module.

DC BUS

Charger in reduced current mode Customer has selected reduced current operation of the charger from a contact

external to the UPS.

Battery charger problems The battery is not being charged. The voltage produced by the charger is

insufficient to maintain a charge on the battery.

[Contact Liebert Customer Service and Support at 1-800-543-2378.]

Low battery warning issued Battery has been discharging and the Low Battery Warning Time (factory set at

5 minutes, adjustable range 1 to 99 minutes) has been reached. Note time

stamp on alarm message.

[Follow appropriate procedures to shut down the critical load in an orderly

sequence.]

Low battery shutdown Battery has discharged to the minimum allowable voltage and the UPS is shut

down. No power is being supplied to the critical load.

[When input power becomes available, perform a UPS start-up procedure.]

DC bus overvoltage DC bus voltage has exceeded the specified limit and the charger has been

turned off. The charger will automatically restart when the DC bus voltage

returns to within tolerance.

[Contact Liebert Customer Service and Support at 1-800-543-2378 if this

condition persists for more than 2 minutes.]

BYPASS

Bypass frequency out of tolerance Input power frequency is outside of the specified tolerance (adjustable range .5

to 5 Hz). Automatic transfers to the Static Bypass Line are prohibited.

[Do not operate the Rotary Switch while this condition is present.]

Load transferred to bypass due to

overload

Critical load connected to the UPS has exceeded the UPS power rating. The

load has been automatically transferred to the Static Bypass Line. Power to the

load is not being conditioned by the UPS. An automatic retransfer will be

attempted when the load is reduced.

[Determine cause of the overload and reduce the load.]

Load transferred to bypass due to DC

overvoltage

DC bus voltage has exceeded the specified limit. The load has been

automatically transferred to the Static Bypass Line. An automatic retransfer will

be attempted when the DC bus voltage returns to within tolerance.

[Contact Liebert Customer Service and Support at 1-800-543-2378 if this

condition persists for more than 2 minutes.]

Excessive retransfers attempted Several automatic retransfer attempts (15 attempts during 20 minutes or less)

have been made to retransfer the load from the Static Bypass Line back to the

UPS. The UPS has not been able to consistently sustain the load because of

an overload condition or an inverter failure. The load will remain on the Static

Bypass Line. Power to the load is not being conditioned by the UPS.

[Check other messages for inverter failure. Determine cause of the overload

and reduce the load.]

Static Switch failure A fault has been detected in the Static Transfer Switch. Automatic transfers to

the Static Bypass Line are prohibited.

[Contact Liebert Customer Service and Support at 1-800-543-2378.]

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Delta AP300 Specifications Page 64

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