Alarms and Events

Table 5: Possible Alarms

 

Low DC

The UPS has been running on

If the UPS is programmed for

 

shutdown (This

battery power because of a power

auto-start, it will automatically

 

alarm is normal

outage or problems in the AC input.

restart when the power outage

 

when the UPS

Battery voltage has dropped below

ends and AC input is again

 

has run on

the shutdown setting, and the UPS

available. If the UPS is not

 

battery for a

has shut down. If bypass is within

programmed for auto-start, you

 

long time)

tolerance, the unit will transfer to

can restart the UPS when the

 

 

static bypass operation. If not, the

power outage ends by pressing

 

 

unit will transfer to stand-by and

the green button inside the door.

 

 

will not supply output voltage.

 

 

 

 

 

 

 

Low DC

The UPS has been running on

If possible, restore AC input

 

warning (This

battery power for a while because of

power to the UPS. If you cannot

 

alarm is normal

a power outage or problems in the

do this, prepare for a possible Low

 

when the UPS

AC input. Battery voltage has

DC shutdown by shutting down

 

has run on

fallen to the warning alarm setting.

the loads (protected equipment)

 

battery for a

If the APC BC300 Series is

connected to the UPS.

 

while)

operating on battery, the unit’s

 

 

 

 

status will not change, but battery

 

 

 

 

voltage will eventually drop to the

 

 

 

 

shutdown setting. At this point, the

 

 

 

 

unit will shut down and sound a

 

 

 

 

“Low DC shutdown” alarm. If the

 

 

 

 

“Low DC warning” alarm occurs

 

 

 

 

during a battery capacity test, the

 

 

 

 

unit transfers back to normal

 

 

 

 

operation.

 

 

 

 

If the unit has not been running on

 

 

 

 

battery power, call APC Technical

 

 

 

 

Support.

 

 

 

 

 

 

 

Mains freq. is

The utility (AC input) frequency is

Ask an electrician to make sure

 

out of tolerance

out of tolerance. The unit transfers

that the correct input frequency is

 

 

to battery operation. If utility

available to the UPS. The

 

 

returns to a frequency within

electrician must correct any

 

 

tolerance, the unit transfers back to

problems in input frequency. If

 

 

normal operation. If not, the unit

input frequency is correct, call

 

 

continues to run on battery until

APC Global Service.

 

 

the “Low DC shutdown” alarm

 

 

 

 

occurs. Then, if bypass is within

 

 

 

 

tolerance, the unit transfers to

 

 

 

 

bypass. If not, the unit transfers to

 

 

 

 

stand-by and does not supply

 

 

 

 

output voltage.

 

 

 

 

 

 

 

Mains is

The utility (AC line voltage) was

If possible, restore AC input

 

moment. out of

momentarily too high or too low.

power to the UPS. If AC input is

 

tolerance (This

The unit transfers to battery; if

available to the UPS, ask an

 

alarm occurs

utility returns to a frequency

electrician to make sure that 1)

 

during a power

within tolerance, the unit transfers

the correct input voltage is

 

outage)

back to normal operation.

available to the UPS. 2) this

 

 

 

voltage is within an acceptable

 

 

 

UPS range

 

 

 

 

 

 

 

 

990-1403

 

 

 

 

 

 

User Guide APC BC300 Series 40kW 208/450/480V UPS

17

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APC BC300 manual Alarms and Events