Eminent Ewent EW3940 User manual

EW3940/EW3941/EW3942/EW3943
Line Interactive UPS – with AVR

EW3940/41/42/43
Line Interactive UPS – with AVR

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EW3940/41/42/43
Line Interactive UPS with AVR
Table of contents
1.0 Introduction ...........................................................................................................2
1.1 Functions and features......................................................................................3
1.2 Packing contents...............................................................................................3
2.0 Remarks about Safety...........................................................................................3
3.0 Working Principle..................................................................................................4
3.1 In AC mode ......................................................................................................4
3.2 AC Failure ........................................................................................................5
3.3 UPS outputs....................................................................................................5
3.4 Battery and Charging:.......................................................................................5
4.0 Main Features .......................................................................................................5
4.1 Unattended Operation ......................................................................................5
4.2 Protection.........................................................................................................5
4.3 Three Kinds of Alarm Function..........................................................................6
4.4 Lock Phase Function........................................................................................6
4.5 The Function of the Self-set Frequency ............................................................6
5.0 Specifications........................................................................................................7
6.0 UPS Led................................................................................................................7
7.0 Installation and Operation......................................................................................8
8.0 Maintenance..........................................................................................................9
8.1 Preventative Maintenance ................................................................................9
8.2 Battery Maintenance.........................................................................................9
8.3 Handling of abnormity.....................................................................................10
9.0 Frequently Asked Questions and other related information..................................10
10.0 Service and support...........................................................................................10
11.0 Warning and points of attention .........................................................................11
12.0 Warranty conditions...........................................................................................13
1.0 Introduction
Congratulations with the purchase of this high-quality Ewent product! This product
has undergone extensive testing by Ewent’s technical experts. Should you
experience any problems with this product, you are covered by a two-year Ewent
warranty. Please keep this manual and the receipt in a safe place.
Register your product now on www.ewent-online.com and receive product updates!

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1.1 Functions and features
The EW3940/41/42 and EW3943 are UPS systems designed to effortlessly handle a
power failure without the loss of important data. Because these devices are also
equipped with a backup function, you can shut down your computer or have it make a
backup without the chance of losing data. These UPS systems are all equipped with a
sound alarm which is activated as soon a power failure occurs, warning you to shut
down your computer or to make a backup.
1.2 Packing contents
The following parts need to be present in the packing:
•EW3940/41/42 or EW3943 Line Interactive UPS with AVR
•Manual
2.0 Remarks about Safety
In order to keep safe in using the UPS, please comply with the following:
•Please charge the battery at least 24 hours before the UPS is in operation.
•After the battery is discharged or over three months without operation, the battery
should be charged immediately for at least 12 hours, ensuring the battery is full
and avoiding any unnecessary damage of the battery.
•The UPS is specially designed for computer only and it should not be connected
with any inductive or capacitive load, like electromotor, daylight lamp, laser
printer, etc.
•The UPS is not suitable for being used in life support systems, because it may
have some problems and bring trouble to the life support systems. The
responsibility will be users', if they insist on using the UPS in life support
systems.
•It is normal that the temperature of the UPS surface reaches up to 50℃when it is
in operation.
•When AC fails and the “ON” button on the front panel is pressed, the UPS will
output voltage; if the “OFF” button on the front panel is pressed, the UPS will not
output voltage.
•It is forbidden to open the case, because there is danger with electricity. If there
is problem, please handle with the instruction of experts.
•It is forbidden to put container containing liquid inside on the UPS, because it will
cause danger of electric shock or fire when the UPS short-circuits.
•When the UPS is abnormal, please cut off power immediately and turn to experts
or the dealer for help.
•As there is no overload protection of the UPS, it cannot be overloaded.
Otherwise, it would cause danger.
•It is strictly forbidden to place and operate the UPS in the following
environment：
oPlace with inflammable gas or corrosive gas or much dust；

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oPlace with very high temperature or very low temperature(above 42℃
or below
o0℃) or high humidity(above 90％) ；
oPlace with direct sunlight or near heater；
oPlace with strenuous vibration；
oOutside
•Please use dry powder fire extinguisher in case of fire; it is forbidden to use fluid
fire extinguisher because it will cause electric shock.
•Please put the socket near the UPS, in this way, it is convenient to disconnect
the socket and cut off power in case of emergency.
Attention! Please ground the UPS for safety purpose
3.0 Working Principle
3.1 In AC mode
When UPS is in normal working mode, AC goes through the filter and the harmful
waves are filtered. After that, AC charges the battery and meanwhile, passes UPS
AVR and the filter and provide power for the equipment.

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3.2 AC Failure
When AC fails, the battery will supply power to the inverter and then passes filter and
provide power for the equipment, ensuring the continuous power supply.
3.3 UPS outputs
The EW3940 UPS has 4 outputs:
•At the left side two outputs for power failure (surge/spike) protection.
•At the right side two outputs for power failure (surge/spike) protection with a
backup function when AC fails. The built-in battery will supply power for
continuous power supply for the equipment.
3.4 Battery and Charging:
•When the UPS is connected to AC, the charger will charge the battery fully in
about 10 hours.
•When the battery is used up, please turn off the UPS and charge the battery for a
least 10 hours when. Then turn on the UPS
4.0 Main Features
4.1 Unattended Operation
•Please connect the UPS to AC and press the ON button on the front panel, the
UPS is turned on and the AC outputs stabilized voltage.
•When AC fails, UPS will supply power to the equipment immediately. And when
the battery is used up, UPS will turn off automatically.
•When AC comes back, UPS will turn on automatically.
4.2 Protection
•Battery discharge protection: when the battery discharges and the UPS is in
inverter mode, the UPS will check and monitor the working status of the battery;
when the battery voltage drops to the limited lowest voltage, the inverter will turn

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off automatically and protect the battery; When AC comes back, the UPS will
turn on automatically.
•Short-circuit Protection ：when the UPS is in inverter mode and there is shock
or short-circuit, UPS will output limited currency, protecting the UPS( When in AC
mode, the UPS will be protected first by input fuse and then transfers to the
inverter working mode).
4.3 Three Kinds of Alarm Function
•When AC fails, and the UPS supplies power, UPS will alarm once every 6
seconds and the beep stops about 40 seconds later.
•When the battery is nearly used up, the UPS will alarm automatically and the
beep frequency is once every 2 seconds.
•When the battery is really used up, the UPS will alarm for a very long time and
after 20 seconds, it will turn off automatically.
4.4 Lock Phase Function
In AC mode, the UPS system automatically tracks AC phase and ensures that the
output wave form of the inverter is the same with AC voltage wave form. In this way, it
reduces the peak pulse and surge voltage to minimizes the interference and damage
to the equipment.
4.5 The Function of the Self-set Frequency
When the UPS is turned on for the first time, the acquiescence frequency is 50/60Hz;
when it is connected to AC, the frequency is automatically set to 50Hz or 60Hz in
accordance with AC.

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5.0 Specifications
MODEL
EW3940 EW3941
650VA 720VA
EW3942
1000VA
EW3943
1200VA
Battery
12V/7 Ah x 1
12V/8 Ah x 1
12V/7 Ah x 2
Type of load
Computer, Display
Input voltage
100/110/120/220/230/240 V ± 25%
Input freq.
50/60 Hz ± 10%
Output voltage
100/110/120/220/230/240 V ± 10%
Output freq.
50/60 Hz ± 0,5-1% (in battery mode)
Backup time
8  20 mins (rated computer as load)
Transfer time
≤ 6 ms (650VA : ≤ 10 ms)
Short-circuit protection
Fuse in AC mode, limited output current in inverter
mode
Efficiency of power
> 80% in inverter mode
Temperature
0 °C  40 °C
Humiduty
10%  90%
Display
LED display: AC, charging, inverting
6.0 UPS Led
Model: EW3940

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Model: EW3941/EW3942/EW3943
7.0 Installation and Operation
1. Shut down the load (for example PC)
2. Put UPS on the proper position
3. Connect load(for example PC) to the UPS
4. Put the plug to the AC power socket(make sure GND is connected well )
SUGGESTION: This UPS is the power supply for the computer, monitor and hard
disk(CD) etc. It has a limited backup time for the load, so you'd better not connect a
printer or other equipment to it.
5. AC mode: press the on/off button on the UPS, the green LED and yellow LED
light up, then you can turn on your computer etc.
6. Battery mode：press the on/off button on the UPS, the red LED lights up, then
you can turn on your computer etc.
Remark：
1. Generally speaking, don't turn off the UPS so the battery keeps charging.
2. When AC fails the UPS will turn to battery mode. Please save important
documents in time.

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8.0 Maintenance
8.1 Preventative Maintenance
Preventive Maintenance ensures the longer Service life of UPS. Please check the
following steps every month：
1. Turn off the UPS;
2. Make sure the air grid is not blocked;
3. Make sure that the UPS surface is not covered by dust;
4. Check whether the input and output connectors are firmly connected
5. Make sure that the UPS is not affected with damp;
6. Turn on the UPS;
7. Let the UPS work in battery mode for about 5 minutes. If there is no other alarm
in this period, then the UPS is working normal; if there is another alarm message,
please contact the local dealer for help.
8.2 Battery Maintenance
The UPS contains a sealed lead-acid maintenance-free battery (batteries). Bad
environmental conditions, to high discharge frequency, to high temperature, etc will
dramatically reduce the battery life. The battery life will also reduce even if it is not
used. It is suggested to discharge the battery once every 3 months when AC is
normal. The following steps explains how to check the battery. When the battery is
near the end of its life, the battery will end in bad performance. So, please remember
the following steps of checking and maintenance:
1. Connect the UPS to AC and turn on the UPS, charge the battery for at least 10
hours. Do not attach any load to the UPS while charging.
2. Connect any load to the UPS (UPS and Surge outputs) and remove the input
plug from the UPS to simulate AC failure. The battery of the UPS will discharge
until the UPS turns off automatically. Please record the connected load and
discharge time for a later check.
3. The battery service life is about 2 to 3 years in normal conditions. But in such
condition as: high temperature or high discharge frequency, the battery service
life will reduce to about 0.5 to 1 year.
4. When the discharge time is 80% of the initial discharge time, the performance of
the battery will be weakened faster and accordingly the checking frequency of the
battery should be changed to every month.

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8.3 Handling of abnormity
The UPS can serve and provide protection to users' equipment, but if there is
something abnormal, please turn to local UPS dealer for help, avoiding unnecessary
damage to the UPS.
When the UPS has the following problems, please follow the Steps below and if the
problem still cannot be solved, Please contact the local dealer.
Phenomenon
Trouble Shooting
Battery fails to supply power.
Check whether the battery
isn't charged enough?
Check whether the UPS is
turned on correctly?
UPS doesn't turn to AC (the input
plug of the UPS has been plugged
into the AC socket and AC is normal,
and the“on/off” button has been
pressed, but the AC indicating light
is not bright and the alarm beeps.
Check whether the fuse is broken?
The fuse is placed on the UPS back
panel or near the AC input
After disconnecting the AC plug, put out
the fuse and check whether the fuse is
broken, if so, please replace it with a new
fuse.
When AC fails, the computer
doesn't work.
When AC is working normal, please turn
on the UPS and charge the battery for at
least 10 hours. Please be sure the load is
connected to the correct output
AC output is normal, but the alarm
beeps.
AC is over voltage or low voltage.
9.0 Frequently Asked Questions and other
related information
The latest Frequently asked questions for your product can be found on the support
page of your product. Ewent will update these pages frequently to assure you have
the most recent information. Visit www.ewent-online.com for more information about
your product.
10.0 Service and support
This user’s manual has been carefully written by Ewent’s technical experts. If you
have problems installing or using the product, please fill out the support form at the
website www.ewent-online.com
You can also contact us by phone. Please check www.ewent-online.com for the
helpdesk phone number and opening hours.

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11.0 Warning and points of attention
Due to laws, directives and regulations set out by the European parliament, some
(wireless) devices could be subject to limitations concerning its use in certain
European member states. In certain European member states the use of such devices
could be prohibited. Contact your (local) government for more information about this
limitations.
Always follow up the instructions in the manual*, especially where it concerns devices
which need to be assembled.
Warning: In most cases this concerns an electronic device. Wrong/improper use may
lead to (severe) injuries!
When you connect the device to the mains, make sure it will not be damaged or
subject to (high) pressure.
A power socket is needed which should be close and easy accessible from the device.
Repairing of the device should be done by qualified Ewent staff. Never try to repair the
device yourself. The warranty immediately voids when products have undergone self-
repair and/or by misuse. For extended warranty conditions, please visit our website at
www.ewent-online.com/warranty
Dispose of the device appropriately. Please follow your countries regulation for the
disposal of electronic goods.
Please check below safety points carefully:
- Do not apply external force on the cables
- Do not unplug the device by pulling the power cable
- Do not place the device near heating elements
- Do not let the device come in contact with water of other liquids
- If there is any strange sound, smoke or odor, remove the device immediately from
the power outlet.
- Do not put any sharp objects into the venting hole of a product
- Do not use any damaged cables (risk of electric shock)
- Keep the product out of reach of children
- Wipe off the product with soft fabric, not water mop.
- Keep the power plug and outlet clean
- Do not unplug the device form the power outlet with wet hands
- Unplug the device when you don’t use it for a long time
- Use the device at a well ventilated place

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*Tip: Ewent manuals are written with great care. However, due to new technological
developments it can happen that a printed manual does not longer contain the most
recent information.
If you are experiencing any problems with the printed manual or you cannot find what
you are looking for, please always check our website www.ewent-online.com first for
the newest updated manual.
Also, you will find frequently asked questions in the FAQ section. It is highly
recommended to consult the FAQ section. Very often the answer to your questions will
be found here.

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12.0 Warranty conditions
The two-year Ewent warranty applies to all Ewent products, unless mentioned
otherwise before or during the moment of purchase. After buying a second-hand
Ewent product the remaining period of warranty is measured from the moment of
purchase by the product’s initial owner. Ewent warranty applies to all Ewent products
and parts, indissolubly connected or mounted to the product it concerns. Power supply
adapters, batteries, antennas and all other products not directly integrated in or
connected to the main product or products of which, without reasonable doubt, can be
assumed that wear and tear during use will show a different pattern than the main
product, are not covered by the Ewent warranty. Products are not covered by the
Ewent warranty when exposed to incorrect/improper use, external influences or when
opening the service parts of the product by parties other than Ewent. Ewent may use
refurbished materials for repair or replacement of your defective product. Ewent
cannot be held responsible for changes in network settings by internet providers. We
cannot guarantee that the Ewent networking product will keep working when settings
are changed by the internet providers. Ewent cannot guarantee the working of web
services, apps and other third party content that is available through Ewent products.
Ewent products with an internal hard disk have a limited warranty period of two years
on the hard disk. Ewent could not be held responsible for any data lost. Please make
sure that if the product stores data on a hard drive or other memory source, you will
make a copy before you return the product for repair.
When my product gets defective
Should you encounter a product rendered defective for reasons other than described
above: Please contact your point of purchase for taking care of your defective product.
EW394X_EN | 06-2016

EW3940/41/42/43
Line Interactive UPS met AVR

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EW3940/41/42/43
Line interactive UPS met AVR
Inhoudsopgave
1.0 Introductie .............................................................................................................2
1.1 Functies en kenmerken .....................................................................................3
1.2 Inhoud van de verpakking..................................................................................3
2.0 Opmerkingen over veiligheid .................................................................................3
3.0 Werking................................................................................................................4
3.1 In de wisselstroommodus .................................................................................4
3.2 Lichtnetstoring..................................................................................................5
3.3 UPS uitgangen ..................................................................................................5
3.4 Accu en laden...................................................................................................5
4.0 Belangrijkste eigenschappen.................................................................................5
4.1 Onbewaakt bedrijf.............................................................................................5
4.2 Beveiliging........................................................................................................6
4.3 Drie soorten alarmfuncties................................................................................6
4.4 Functie Fasevergrendeling ...............................................................................6
4.5 De werking van de zelfinstellende frequentie....................................................6
5.0 Specificaties..........................................................................................................7
6.0 UPS Led................................................................................................................7
7.0 Installatie en ingebruikname..................................................................................8
8.0 Onderhoud ............................................................................................................8
8.1 Preventief onderhoud .......................................................................................8
8.2 Onderhoud accu...............................................................................................9
8.3 Afwijkingen verwerken......................................................................................9
9.0 Veelgestelde vragen en andere relevante informatie ...........................................10
10.0 Service en ondersteuning..................................................................................10
11.0 Waarschuwingen en aandachtspunten..............................................................10
12.0 Garantievoorwaarden........................................................................................12
1.0 Introductie
Gefeliciteerd met de aankoop van dit hoogwaardige Ewent product! Dit product is door
de technische experts van Ewent uitgebreid getest. Mocht dit product ondanks alle
zorg problemen vertonen, dan kun je een beroep doen op de twee jaar Ewent
garantie. Bewaar deze handleiding samen met het bewijs van aankoop daarom
zorgvuldig.
Registreer je aankoop nu op www.ewent-online.com en ontvang product updates!

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1.1 Functies en kenmerken
De EW3940/41/42 en de EW3943 zijn UPS systemen die probleemloos een
stroomuitval kunnen opvangen zonder dat er belangrijke data verloren gaat. Omdat
deze apparaten ook beschikken over een back-up functie van tien minuten, kun je de
computer zonder problemen afsluiten of een back-up laten maken zonder dat je
belangrijke data kwijt raakt. Omdat deze UPS systemen beschikken over een
geluidsalarm welke wordt ingeschakeld wanneer de stroom uitvalt, weet je precies
wanneer je de computer moet afsluiten of snel een back-up moet maken
1.2 Inhoud van de verpakking
De volgende onderdelen zijn aanwezig in het pakket:
•EW3940/41/42 of EW3943 Line Interactive UPS met AVR
•Handleiding
2.0 Opmerkingen over veiligheid
Voldoe aan het volgende om de UPS veilig te gebruiken:
Laad de accu ten minste 24 uur voordat u de UPS gaat gebruiken.
•Na het ontladen van de accu of na meer dan drie maanden niet gebruikt te zijn,
moet de accu direct worden geladen gedurende minstens 12 uur om er voor te
zorgen dat de accu vol is en om onnodige schade aan de accu te voorkomen.
•De UPS is specifiek voor computers ontworpen en moet niet worden verbonden
met enige inductieve of capacitieve belasting, zoals een elektromotor,
daglichtlamp, laserprinter, enz.
•Het is niet aan te bevelen de UPS te gebruiken in combinatie met medische
apparatuur.
•De behuizing van de UPS kan 50 graden worden bij gebruik. Dit is normaal.
•Als de wisselstroom uitvalt en de "aan/uit"-knop op de voorkant wordt ingedrukt,
geeft de UPS stroom af; als de "aan/uit"-knop wederom wordt ingedrukt, geeft de
UPS geen stroom af.
•Het is verboden om de behuizing te openen, omdat dit gevaar door elektriciteit
kan opleveren. Als er een probleem is, moet u de aanwijzingen van experts
opvolgen.
•Breng de UPS niet in contact met vloeistoffen om kortsluiting, elektronische
schokken of brandgevaar te vermijden.
•Bij abnormaal gedrag van de UPS moet u direct de stroomtoevoer uitschakelen
en hulp van experts of de verkoper inroepen.
•Het is streng verboden om de UPS in de volgende omgevingen te plaatsen en
gebruiken:
oPlaats met brandbaar gas of corrosief gas of veel stof;
oPlaats met heel hoge of heel lage temperaturen (hoger dan 42°C of lager
dan 0°C) of met een hoge vochtigheid (hoger dan 90％);

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oPlaats in direct zonlicht of bij een kachel;
oPlaats met krachtige trillingen;
oBuitenshuis
•Gebruik een brandblusser met droog poeder in geval van brand; gebruik van een
blusser met vloeistof is verboden omdat dit elektrische schokken veroorzaakt.
•Zorg er voor dat de UPS zich dichtbij een stopcontact bevindt zodat u in
noodgevallen snel de stekker uit het stopcontact kunt trekken.
Let op! De UPS moet geaard zijn.
3.0 Werking
3.1 In de wisselstroommodus
Als de UPS in de normale werkstand staat, passeert wisselstroom het filter en worden
de schadelijke golven gefilterd. Daarna laadt de wisselstroom de accu en passeert
intussen de UPS, AVR en het filter en levert energie voor de apparatuur.

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3.2 Lichtnetstoring
Bij een lichtnetstoring levert de accu stroom aan de omvormer waarna deze het filter
passeert. Vervolgens wordt de aangesloten apparatuur van stroom voorzien,
waardoor een continue voeding verzekerd is.
3.3 UPS uitgangen
De EW3940 UPS heeft 4 uitgangen:
•Aan de linkerkant twee uitgangen voor bescherming tegen een stroomstoring
(overbelasting)
•Aan de rechterkant twee uitgangen voor bescherming tegen een stroomstoring
(overbelasting) met een back-up functie bij een lichtnetstoring. De ingebouwde
batterij levert dan stroom aan de aangesloten apparatuur.
3.4 Accu en laden
•Als de UPS op het lichtnet is aangesloten, laadt de lader de accu volledig op in
ongeveer 10 uur.
•Als de accu leeg is, moet u deze direct laden om de levensduur van de accu te
verlengen.
4.0 Belangrijkste eigenschappen
4.1 Onbewaakt bedrijf
•Sluit de UPC op het lichtnet aan en druk op de "aan/uit"-knop op de voorkant; de
UPS wordt ingeschakeld en de wisselstroomuitgangen leveren een
gestabiliseerde spanning.
•Bij storing in het lichtnet levert de UPS direct energie aan de apparatuur. En als
de accu leeg is, schakelt de UPS automatisch uit.
•Als het lichtnet weer stroom levert, schakelt de UPS automatisch in.

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4.2 Beveiliging
•Beveiliging tegen ontlading van de accu: Wanneer de accu leeg is en de UPS is
werkzaam in de omvormermodus, dan controleert en bewaakt de UPS de status
van de accu. Wanneer de accuspanning een dusdanig laag niveau heeft bereikt,
wordt de omvormer automatisch uitgeschakeld ter bescherming van de accu.
Wanneer het lichtnet weer stroom levert, schakelt de UPS automatisch weer in.
•Beveiliging tegen kortsluiting: als de UPS in de omvormermodus werkt en een
schok of kortsluiting treedt op, geeft de UPS beperkt stroom af ter bescherming
van de UPS (in de wisselstroommodus wordt de UPS eerst beschermd door een
zekering en gaat daarna over naar de omvormermodus).
4.3 Drie soorten alarmfuncties
•Indien een lichtnetstoring optreedt , schakelt de UPS automatisch over op de
interne accu. De UPS geeft elke 6 seconden een alarmsignaal. Dit duurt zo’n 40
seconden.
•Als de accu bijna leeg is, geeft de UPS automatisch een alarmsignaal om de 2
seconden.
•Als de accu geheel leeg is, geeft de UPS langdurig een alarmsignaal en schakelt
deze na 20 seconden automatisch uit.
4.4 Functie Fasevergrendeling
In de wisselstroommodus volgt de UPS automatisch de wisselstroomfase en zorgt
deze er voor dat de golfvorm bij de uitvoer van de omvormer gelijk is aan de golfvorm
van de wisselstroom; op deze manier worden piekpulsen en -spanningen voorkomen
en de invloed op schade aan de apparatuur beperkt.
4.5 De werking van de zelfinstellende frequentie
Als de UPS de eerste keer wordt ingeschakeld, is de standaardfrequentie 50/60 Hz;
bij aansluiting op het lichtnet wordt de frequentie automatisch ingesteld op 50 Hz of 60
Hz.