250/450 Manuals



APC PowerStack 250/450
 Uninterruptible Power Supply User’s Manual
990-5017 Revision 1 7/98
English
Installation
To obtain warranty coverage, please fill out and
Wall Mounting
Desktop Use
return the warranty registration card now.
The brackets on the UPS can be rotated 90 ° for wall
This UPS is provided with four adhesive-backed
Inspection
mounting.  Remove the screws, rotate the brackets,
rubber “feet” for desktop use.  Attach the feet to the
Inspect the APC PowerStack 250/450
and insert the screws in the appropriate holes.
bottom of the unit and remove the ears to use it on a
Uninterruptible Power Supply (UPS) upon receipt.
desktop.
Wall-mount the unit
Notify the carrier and dealer if there is damage. The
with the controls
The recommended placement of the feet is shown by
packaging is recyclable; save it for reuse or dispose
towards or at the
a small + on the bottom corners of the unit:
of it properly.
top,  not at the
Battery Connection
bottom of the unit .
Before beginning installation of the UPS, please
follow the Battery Connection instructions on the
front of the unit, or follow the steps under Replacing
The illustrations above show the proper positions for
the Battery Pack.
wall mounting the unit
Placement
 Check the Site Wiring Fault Indicator
Warning!
Warning!  Changes or modifications to this unit
Caution!  If the site wiring fault indicator lights,
not expressly approved by the party responsible
Do not mount the unit
get a qualified electrician to correct the building
for compliance could void the warranty.
on the wall as shown
wiring.
in the illustrations at
Rack Mounting
left.  Doing so could
 Computer Interface Port
The UPS comes with standard 19" (46.5 cm) rack
result in a safety
The interface port is used for communicating with
mount brackets.  It is supplied with four (4) screws
hazard.
the UPS.  See enclosed documentation for details.
to attach the mounting brackets (ears) to the chassis.
Connect the Battery Pack
Select a rack location with adequate air flow that is
Rear View
The UPS is shipped with the battery pack
free from excessive dust. Ensure that the air vents on
disconnected.  To connect the battery pack, follow
the sides of the UPS are not blocked. Do not operate
the procedure in Replacing the Battery Pack, below.
the UPS where temperature or humidity are outside
the limits in the Specifications section of this
 Charge the battery pack
manual.
The UPS charges its battery pack whenever it is
Once the UPS is mounted, please follow the
connected to utility power. The battery pack will
installation instructions in the Smart-UPS Quick
charge fully during the first 4 hours of normal
Reference Guide.
operation.  Do not expect full battery back-up
runtime during this initial charge period.
Operating Instructions
Switch On —   Switch Off
 
On Battery
Cold Start
During on-battery operation, the yellow on-battery
Note:  Cold start is not a normal operating
LED illuminates and the UPS sounds an audible
condition.
alarm consisting of 4 beeps every 30 seconds. The
When the UPS is off and there is no utility power, it
alarm stops when the UPS returns to on-line
is possible to cold start the UPS to power the loads
operation.
from the UPS’s battery pack.
Low Battery
With the UPS plugged in, press and release the
· 
Press and hold the on/off/test button until the
When the UPS is operating on-battery and the
on/off/test button to supply power to the loads.
UPS emits a constant tone.
energy reserve of the battery pack runs low, the UPS
The loads are immediately powered while the UPS
beeps continuously until the UPS shuts down from
· Release the on/off/test button during the tone to
performs a self-test. Press and release the button
battery pack exhaustion or returns to on-line
start the UPS.
again to turn off power to the loads. It may be
operation, if the utility power returns before the
convenient to use the UPS as a master on/off switch
battery pack is exhausted..
 Overload
for the protected equipment.
When loads exceed the UPS’s capacity, the red
 Replace Battery
overload LED illuminates and the UPS emits a
The green on-line LED illuminates when the
If the battery pack fails a self-test, the UPS emits
sustained tone.  The alarm remains on until the
UPS is supplying utility power to the loads.
short beeps for one minute and the red replace
overload is removed. Disconnect nonessential load
Self-test
battery LED illuminates.
equipment from the UPS to eliminate the overload.
The UPS performs a self-test automatically when
The UPS repeats the alarm every five hours. Perform
If the overload is severe, the input circuit breaker
turned on, and every two weeks thereafter.
the self-test procedure to confirm replace battery
may trip (the resettable center plunger of the circuit
Automatic self-test eases maintenance requirements
conditions. The alarm stops when the battery pack
breaker pops out). Disconnect nonessential load
by eliminating the need for periodic manual self-
passes the self-test.
equipment from the UPS to eliminate the overload
tests.
and press the plunger back in.
During the self-test, the UPS briefly powers the loads
If there is AC power and the circuit breaker does not
on-battery. If the UPS passes the self-test, it returns
trip during overload, the loads are still powered.  If
to on-line operation.
the circuit breaker trips or the UPS attempts to
If the UPS turns off during the self-test and emits a
transfer to battery, the loads’ power will be shut off.
fading tone, the batteries are not connected properly.
Turn the UPS off then back on to power the loads.
The loads are not affected by a failed test. Recharge
the battery pack overnight and perform the self-test
again. If the replace battery LED is still on, replace
the battery pack using the Replacing the Battery
Pack
 procedure.
Storage
Storage Conditions
Extended Storage
Before storing, charge the UPS for at least 8 hours. Cover the UPS and store it lying
At -15 to +30 °C (+5 to +86 °F), charge the UPS’s battery pack every 6 months.
flat in a cool, dry location, with its battery pack fully charged.
At +30 to +45 °C (+86  to +113 °F), charge the UPS’s battery pack every 3 months.


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