990-4200 Revision 1 12/97

APC Smart-UPS 420/620

Initial Start-Up
To obtain warranty coverage, please fill out and
return the warranty registration card now.
Inspection
Inspect the UPS upon receipt. Notify the carrier and
dealer if there is damage. The packaging is
recyclable; save it for reuse or dispose of it properly.
Placement Connect the Loads
Plug the loads into the output connectors on the rear
of the UPS. To use the UPS as a master on/off
switch, make sure that all of the loads are switched
on.
Connect Network Surge Suppression
Install the UPS in a protected area that is free of (Optional)
excessive dust and has adequate air flow. Do not
operate the UPS where the temperature and Connect a single 10Base-T/ 100Base-Tx
humidity is outside the specified limits. network cable into the RJ-45 network surge
Full Time Surge Protected Outlet protection IN jack on the back of the UPS.
Warning: Changes or modifications to this unit
not expressly approved by the party responsible The top-most off-white outlet provides surge Connect from the OUT jack with network
for compliance could void the warranty. protection only. It is rated for 500VA (300W). cabling (not supplied) to a network port on the
Equipment plugged into this outlet should require computer.
Connect to Utility surge protection, but should not require power
during a utility power failure. This could include a Connect Computer Interface
laser printer, scanner, fax, or audio device. Port (Optional)
PowerChute® plus power management software is
Warning: The top outlet has voltage as long as included with this UPS. Connect the supplied
the UPS is connected to an active AC power interface cable to the 9-pin computer interface port
source. It has voltage even when the UPS is on the back panel of the UPS. Connect the other end
turned off. to a dedicated serial port on your computer. See
Battery Power Supplied Outlets software documentation for installation instructions.
Charge the battery
The lower three outlets provide protection
from surges and battery backup protection. The UPS charges its battery whenever it is
Plug a computer, monitor, and other “data- connected to utility power. The battery will charge
critical” devices into these outlets. Never plug a fully during the first 4 hours of normal operation.
laser printer into the Battery Power Supplied Do not expect full runtime during this initial charge
outlets. period.

Operating Instructions
Switch On — Switch Off The loads are not affected by a failed test. Recharge
the battery overnight and perform the self-test again. Replace Battery
If the replace battery LED is still on, replace the If the battery fails a self-test, the UPS emits short
battery using the Replacing the Battery procedure. beeps for one minute and the replace battery LED
On Battery illuminates.
During on-battery operation, the on-battery The UPS repeats the alarm every five hours.
LED illuminates and the UPS sounds an Perform the self-test procedure to confirm replace
With the UPS plugged in, press and release audible alarm consisting of 4 beeps every battery conditions. The alarm stops when the battery
the on/off/test button to supply power to the 30 seconds. The alarm stops when the UPS returns passes the self-test.
loads plugged into the Battery Power Supplied to on-line operation. The alarm may also be disabled Shutdown Mode
outlets. The equipment plugged into the Full Time using PowerChute® plus power management
software. If there is no power, the host connected to the
Surge Protected outlet (the top outlet) has power
computer interface port can command the UPS to
whenever the UPS is connected to an active AC Low Battery shut down. This is normally done to preserve
power source.
When the UPS is operating on-battery and the battery capacity after a controlled shutdown of the
The Battery Power Supplied loads are immediately energy reserve of the battery runs low, the UPS protected system. In shutdown mode the UPS stops
powered while the UPS performs a self-test. Press beeps continuously until the UPS shuts down from supplying power to the load. The online and
and release the button again to turn off power to the battery exhaustion or returns to on-line operation. overload LED indicators flash alternately or, if the
loads. It may be convenient to use the UPS as a UPS has shutdown due to a low battery, the UPS
Overload
master on/off switch for the protected equipment. will beep once every 4 seconds for approximately 16
When loads exceed the UPS’s capacity, the seconds. When line power is restored, the UPS will
The on-line LED illuminates when the UPS overload LED illuminates and the UPS return to on-line operation.
is supplying utility power to the loads. emits a sustained tone. The alarm remains
on until the overload is removed. Disconnect Cold Start
Self-test
The UPS performs a self-test automatically when nonessential load equipment from the UPS to Note: Cold start is not a normal operating
turned on, and every two weeks thereafter (by eliminate the overload. condition.
default). Automatic self-test eases maintenance If the overload is severe, the input circuit breaker When the UPS is off and there is no utility power, it
requirements by eliminating the need for periodic may trip (the resettable center plunger of the circuit is possible to cold start the UPS to power the loads
manual self-tests. breaker pops out). Disconnect nonessential load from the UPS’s battery.
During the self-test, the UPS briefly operates the equipment from the UPS to eliminate the overload
and press the plunger back in. • Press and hold the on/off/test button
loads on-battery. If the UPS passes the self-test, it until the UPS begins beeping.
returns to on-line operation. If there is AC power and the circuit breaker does not • Release the on/off/test button during the beeping
If the UPS fails the self-test it immediately trip during overload, the loads are still powered. If to start the UPS.
returns to on-line operation and lights the the circuit breaker trips or the UPS attempts to
replace battery LED. transfer to battery, the loads’ power will be shut off.
Turn the UPS off then back on to power the loads.

Storage
Storage Conditions Extended storage
Store the UPS covered and upright in a cool, dry location, with its battery fully At -15 to +30 °C (+5 to +86 °F), charge the UPS’s battery every 6 months
charged. Before storing, charge the UPS for at least 4 hours. Disconnect any cables
At +30 to +45 °C (+86 to +113 °F), charge the UPS’s battery every 3 months.
connected to the computer interface port to avoid unnecessarily draining the
battery.
Replacing the Battery
This UPS has an easy to replace hot-swappable battery.
Note: Please read the cautions in the APC Safety Guide. 3.Disconnect the two wires connecting the battery to the UPS.
Loosen the wires by wiggling them while pulling straight back
Replacement Batteries from the battery connector.
See your dealer or call the number in this manual for information on replacement 4.Connect the new battery in place of the old.
battery kits. For 280 and 420 models, order RBC 2. For 650 models, order RBC 4.
Battery Replacement Procedure Note: Small sparks at the battery connections are normal
during connection.
Battery replacement is a safe procedure, isolated from electrical hazards. You may
leave the UPS and loads on for the following procedure. 5.Place the new battery in the UPS. Use care to avoid pinching the
wires.
Note: Once the battery is disconnected, the loads are not protected from
power outages.
1.Lay the UPS on its left side. Remove the two screws holding on 6.Close the battery compartment door and replace the screws.
the battery door and open the door.
Note: It may be necessary to pull the battery door slightly
toward the front of the unit in order to open the door fully.
7.Dispose of the old battery properly at an appropriate recycling
facility or return it to the supplier in the packing material for the
new battery. See the new battery instructions for more
2.Gently pull out the battery by grasping the white tab.
information.

Troubleshooting
Problem Possible Cause Solution
UPS will not turn on. On/off/test button not pushed. Press the on/off/test button to
power the UPS and the loads.
UPS input circuit breaker Reduce the load on the UPS
tripped. by unplugging equipment and
reset the circuit breaker by
pressing the plunger back in.
UPS will not turn on or off. Computer interface problem. Disconnect the computer
interface. If the UPS now
works normally, check the
interface cable and the
attached computer.
UPS operates on-battery even UPS's input circuit breaker Reduce the load on the UPS
though normal line voltage is tripped. by unplugging equipment and
thought to exist. reset the circuit breaker by
pushing the plunger back in.
UPS beeps occasionally. Normal UPS operation. None. The UPS is protecting
the load.
UPS does not provide The UPS's battery is weak due Charge the battery. The UPS's
expected back up time. to recent outage or is near the batteries require recharging
end of its service life. after an extended outage.
Batteries age faster when put
into service often and when
operated at elevated
temperatures. If the battery is
near the end of its service life,
consider replacing the battery
even if the replace battery
indicator is not yet lit.
On-line and overload indicators The UPS was shutdown by None. The UPS will restart
are flashing alternately. PowerChute® plus software. automatically when utility power
returns.
All indicators are flashing. Internal UPS fault. Do not attempt to use the UPS.
Turn the UPS off and have it
serviced immediately.
The UPS operates normally, Building wiring error such as Have a qualified electrician
but the site wiring fault missing ground or hot to correct the building wiring.
indicator is lit. neutral wire reversal.
On-line and on-battery Internal UPS fault. Do not attempt to use the UPS.
indicators only are flashing Turn the UPS off and have it
serviced immediately.
All indicators are off and the The UPS is shutdown and the None. The UPS will return to
UPS is not operating. battery is discharged from an normal operation when the
extended power outage. power is restored and the
battery has a sufficient charge.
The replace battery light is Weak batteries. Allow the batteries to recharge
illuminated. for at least 4 hours. If the
problem persists after
recharging, replace the
batteries.
Replacement batteries not Confirm the battery
connected properly. connections.
The overload light is The UPS is overloaded. Reduce the load on the UPS
illuminated or flashing by unplugging equipment.
For Computer Interface Port Specifications, see the APC Website.
Service
If the UPS requires service do not return it to the dealer!
Follow these steps:
1.Use the Troubleshooting section of the Quick Reference Guide to eliminate
common problems.
2.Verify that no circuit breakers are tripped. A tripped circuit breaker is the most
common UPS problem!
3.If the problem persists, call customer service or visit the APC Internet Website
(www.apcc.com).
• Note the model number of the UPS, the serial number, and the date purchased. A
technician will ask you to describe the problem and try to solve it over the phone,
if possible. If this is not possible the technician will issue a Return Merchandise
Authorization Number (RMA#).
• If the UPS is under warranty, repairs are free. If not, there is a repair charge.
4.Pack the UPS in its original packaging. If the original packing is not available,
ask customer service about obtaining a new set.
• Pack the UPS properly to avoid damage in transit. Never use Styrofoam beads for
packaging. Damage sustained in transit is not covered under warranty.
• Include a letter with your name, RMA#, address, copy of the sales receipt,
description of the trouble, your daytime phone number, and a check (if
necessary).
5.Mark the RMA# on the outside of the package
6.Return the UPS by insured, prepaid carrier to the address given to you by
Customer Service.
North & South America Europe
APC APC
132 Fairgrounds Road Ballybritt Business Park
West Kingston, Rhode Island 02892 USA Galway, Ireland 10800-702000
1-800-800-4APC/1-401-789-5735 353-91-702020
Internet: http://www.apcc.com
E-Mail: apctech@apcc.com E-Mail: apceurtech@apcc.com

Specifications
420 VA 620 VA
Acceptable input voltage 0 - 320 VAC
Input voltage (on-line operation)* 165 - 283 VAC
Output voltage * 208 - 253 VAC
Input Over Current Protection Resettable circuit breaker
Frequency limits (on-line operation) 47 - 63 Hz (autosensing)
Transfer time 4 ms typical, blackout response time
Maximum load 420 VA 620 VA
260 W 390 W
On-battery output voltage 230 VAC
On-battery frequency 50 or 60 Hz, ±0.1 Hz; unless synchronized to utility
during brownout
On-battery waveshape Stepped sine-wave
Output Over Current Protection Overcurrent and short-circuit protected, latching
shutdown on overload
Battery type Spill proof, maintenance free, sealed lead-acid
Typical battery life 3 to 6 years, depending on number of discharge
cycles and ambient temperature
Typical recharge time 2 to 5 hours from total discharge
Operating temperature 0 to +40 °C (+32 to +104 °F)
Storage temperature -15 to +45 °C (+5 to +113 °F)
Operating and storage relative humidity 0 to 95%, non-condensing
Operating elevation 0 to +3,000 m (0 to +10,000 ft)
Storage elevation 0 to +15,000 m (0 to +50,000 ft)
Audible noise at 1 m (3 ft) <45 dBA
Size (H x W x D) 16.8 x 11.9 x 36.8 cm
(6.6 x 4.7 x 14.5 in.)
Weight - net (shipping) 7.30 (9.12) kg 10.53 ( 12.34) kg
16.108 (20.10) lb. 23.51 (27.21) lb.
Safety and approvals VDE licensed to EN50091 and EN60950
EMC certification EN55022
Electromagnetic immunity IEC 801-2 level IV, 801-3 level III, 801-4 level IV
* User-adjustable through PowerChute® (see software documentation)