SERVICE MANUAL

1-1.5KVA model
 General Information
Getting start

If you want to know:

? Overview and what special for this UPS, refer to section Introduction.
? Replacing Battery Pack, refer to Replacing The Battery Pack.
? Open external case, refer to Steps to Open the Case.
? Electrical function and principle, refer to Principle of Operation.
? Whether UPS works properly, refer to Alignments.
? What happened to the UPS, refer to Trouble Shooting.
? Electrical performance, refer to Electrical Spec.
Conventions

This service manual uses the following conventions to alert you some important information for
safe operation and quick working.

Warning: Denotes a procedure or operation, which, if not perform correctly, may

STOP result in personal injury. Be sure not to continue operation until
indicated conditions are fully understood and met.

Caution: Denotes a procedure or operation, which, if not perform correctly, may

! cause damage to the UPS. Be sure not to continue operation until
indicated conditions are fully understood and met.

Information and Tips: There are some tips and skills after this symbol. During
service operations, these skills are provided by our design
engineers which may help you quickly finish your work.

1
 Important Safety Instructions
STOP

1. For qualified service personnel only.

2. DO NOT perform any internal service or adjustment of this product unless another person is
capable of rendering first aid and resuscitation is present.

3. Dangerous voltage exists at several points in this product. To avoid personal injury, don't
touch any exposed connections or components while UPS is active.

4. Turn off the UPS and disconnect input power cord before removing outside protective cover.

5. AC voltage is always present if the input AC power is still available.

6. High voltage may present at DC capacitors. Before opening the outside cover, wait for at
least five minutes after turning off the UPS.

7. Verify input source (voltage and frequency) before service.

1. DO NOT make internal batteries short-circuited.

2. If the battery connectors (P5, P8) are disconnected, be sure to plug in the input power cord
and the input power is available before re-connect the battery connectors.

3. After service, verify the polarity of batteries, the tightness of all screws and connectors
before restarting the UPS.

After opening the cover, please always check the tightness of all wires, connectors,
and screws first. Then check if there is any de-colored components inside

2
 STEPS TO OPEN THE CASE
There are two types of the mechanical structure,Tower and RACK.To open the outside case,
please follow steps and figures below:
1. Remove related screws on STEP 1 figure.
2. Slide outside cover in the direction shown in STEP 2.
3. Done.

TOWER RACK

STEP1

STEP2

3
STEP3

4
 I. INTRODUCTION

For all series of UPS, they are strictly tested and carefully designed. We always do our best to
make our products more reliable and safer, this is also the goal of our company. However, due
to the lifetime of electrical components and some unpredictable reasons, there will be
unavoidable failures of this UPS. If this situation occurs, service of qualified person is needed.
This service manual will guide the technicians to repair and adjust a problematic UPS. If the
UPS still does not work properly, please contact with us and we will be glad to solve any
problems you met.

Because of the following unique features of this series UPS (Uninterruptible Power System), it
is very easy to maintain and service.
* All major power components are put on PCB.
* All PCBs are interconnected with connectors.
* Major parts are simply connected with flexible insulated wires and plugs.

This service manual consists of 4 major parts:

1. Introduction.
2. Principle of operation: It describes the functions and principles of each part.
3. Alignments: It describes the locations and methods needed to adjust this UPS.
4. Trouble shooting: This part describes the possible failure conditions and procedures to
repair it.

Before starting to serve this UPS, be sure to read this manual carefully for a correct and safe
operation.

5
 II. PRINCIPLE OF OPERATION
This 1KVA high input power factor UPS system contains two major PCB assemblies. They are
including:
1. PSDR: contains major parts of (1) charger, (2) DC power supply, (3) unit power factor
correction, (4) DC-DC converter, (5) inverter and (6) output circuits.
2. CNTL : contains major parts of protection, signaling circuits, regulation and control
circuits of inverter
The simplified schematics in figure 1 shows how the major circuits are connected and illustrates
the overall system functions.

Figure 1: Circuit connection for 1-1.5KVA

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The locations of these assemblies in Tower and Rack structure are shown in figure 2.1 and
figure 2.2.

Figure 2.1 : Sub-assembly location in Tower

7
 Front Panel Function Display

Key Board

Programmble

Battery

Power Board

Control Board

Outlet Interference Slot Fan RS232 USB

Inlet Circuit Breaker External Battery Connector

Figure 2.2 : Sub-assembly location in Rack

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The block diagram in figure 3, shows the UPS at normal operation from left to right. When a
protection circuit is triggered or a fault condition occurs, the output supply is transferred
immediately from inverter to AC mains by a bypass relay. The operation principle will be
explained in later section.

Basically, this ON-LINE UPS system utilizes high frequency PWM techniques to achieve high
efficient performance. This UPS can deliver a clean, regulated sine-wave output at any load
under full load. The sub-systems are described as below:

O/P
I/P PFC
RY
N.F. AC/DC DC/AC N.F.
RY

DC/DC
CHARGER

BATTERY

Figure 3: Block Diagram for UPS.

1.POWER STAGE (PSDR)
As shown in figure1,the power stage consists of charger, unit power factor correction, DC
power supply, DC-DC converter, inverter and output circuits.

1-1 Charger Sub-System:

The purpose of charger is to charge and to maintain the batteries at full charged condition.
Refer to figure 4, the voltage flyback switching power supply provides a constant DC voltage
(42.4Vdc ) for batteries. Besides providing constant voltage, the power supply also limits the
current flowing into batteries and therefore protects and prolongs the life time of charged
batteries.

Figure 4: Charger Circuit Diagram

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 1-2 DC Power Supply Sub-System:
The input of the DC power supply is connected to the battery bus, i.e., the output of the
charger. The output of DC power supplies provide +12 Vdc for the bias supply of IC's working
voltage and the fan(s) voltage. The DC power supply works only when the 12 Vdc regulator
supplies Vcc to its control IC. To have proper operation of 12 Vdc regulator, its input power is
controlled by the switch as indicated in figure 5.

Figure 5: Schematic for DC power supply

1-3 Inverter Sub-System:

The UPS transfers ＋ ,－ DC bus voltages to the AC output voltage through an inverter of half
bridge configuration at normal operation. The schematic diagram of inverter is shown in
figure 6.

To construct a high frequency (19.2kHz) PWM inverter, the drivers receive switching signals
from PWM generation circuit through a pair of photo-couplers to trigger the upper IGBT and
the lower IGBT alternately. The output of IGBT's is filtered by an LC circuit to reduce the o/p
voltage harmonics distortion.

10
 Figure 6: Schematics for inverter

1-4 Output Sub-System:

The bypass relay receives signal from control circuit to switch the output of the UPS from
bypass to inverter, and vice versa. The output noise filter circuit blocks EMI noise to the
loads.

1-5 Input Power Factor Correction Sub-System:

The purpose of power factor correction (P.F.C.) circuit is to make the input current and
voltage in phase and therefore achieve a high input power factor. The schematic is indicated
in figure 7.
When the input AC power cord is plugged in, the AC relay is activated and the AC power
goes through noise filter to the charger and to the line detector. Both DC buses present
voltages at about 1.4 times of input RMS voltage. When the "on" switch is pressed, the
P.F.C. circuit is enabled and the DC buses are regulated at ± 360 Vdc.

Figure 7: I/P PFC configuration

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 1-6 DC-DC Converter Sub-System:
The major function of the UPS is to deliver accurate AC power to the loads connected to it
whenever the AC line is correct or fails. In this system, the batteries release the stored
energy to supply inverter immediately upon AC line fails.
Refer to figure 8, the battery voltage is transformed through a push-pull DC-DC converter to
±360Vd as DC buses for inverter. When the line fails, the ±360Vdc DC sources are caught
up to supply the power needed by the inverter immediately.

Figure 8 : DC -DC circuit for 1K series

2.MAIN CONTROL PCB ASSEMBLIES (CNTL)

These assemblies are the control center of UPS. It is composed of three major circuits as
following.
(1) Regulation & control
(2) Protection
(3) Signaling

2-1 REGULATION & CONTROL SUB-SYSTEM:

This portion can be seen as brain of the UPS. It provides the control pulses to the switching
elements which deliver power to the output. The sub-system also regulates the output to
ensure that the UPS is delivering constant AC voltage to the loads.

The inverter signal is sensed directly by resistor division. It is compared with a reference
signal from sine wave generator. The difference of these two signals (error signal) alter the
pulse widths of PWM signals which control the duty cycles of switching elements to regulate
the output voltage within specification.

In order to avoid un-wanted surge current at the transfer of bypass relay, the bypass signal
activates the tracking circuit. It matches the inverter voltage with the line voltage by having
the amplitude of the reference signal following the variation of line voltage.

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When the main is applied and the switch is turned on, a 10-second timer is triggered. The
bypass relay stays at bypass position in this time period. At the end of this period, the bypass
signal is removed and the relay transfers to inverter output.

2-2 PROTECTION SUB-SYSTEM:

The UPS provides the following protection circuits :
1. Overload protection
The load detector senses the load current. i.e. the inverter current, and sends the signal by
two paths. In battery mode, the UPS will go to failure mode if overload condition happened.
The panel will indicate the fault condition. There are two kinds of protection in our UPS:

a. Overload Protection: The UPS collects the continuous overload signals through CPU
switch the bypass relay. If the output load is lower than 110% of rated load (VA ,or
Wattage) the UPS keeps running on inverter running and warnning. If the output load is
between 110% and 130% of rated load (VA ,or Wattage) the UPS transfers to bypass
after 12s. If the output load is higher than 130% of rated load, the UPS transfers to
bypass after 1.5s immediately.
b. Cycle by Cycle Current Limit: When output loads sink a high surge current for a
short time, a high inverter current is detected and the inverter switches, i.e. the IGBT's,
are turned off pulse by pulse to protect themselves from thermal runaway. The output
relay stays at inverter output position unless a continuous overload is detected or an
abnormal inverter operation occurs.

2. Battery over or under shut down

Upon the battery voltage declines to battery-under/over level, the UPS will warning and the
LCD will display the fault code ,then shut down.

In case of the battery voltage is high voltage, the UPS will warning and the LCD will
display the fault code.
3. Inverter output abnormal protection
The inverter failure signal shuts down the inverter immediately, makes the buzzer a
continuous alarm, and the LCD displays the fault code.

" The failure signal latches itself unless SW off or battery is empty".
4. Over temperature protection
The thermal switch detects the temperature of PSDR heat sink. The thermal switch is
electrically connected to the CPU. An opened thermal switch is thought as temperature
failure by the UPS. The LCD will display the fault code.
5. Bus over/under/unbalance-voltage protection
To protect any BUS over/under/unbalance -voltage condition especially for the half-bridge
load. The LCD will display the fault code.

2-3 Signaling Sub-System:

When the AC line is unable to supply, the batteries release energy inside to supply the
inverter immediately. At the same time, the buzzer beeps every 4 seconds.

13
 Upon the batteries are discharged to battery-low level, the battery-low signal is activated
and the buzzer beeps every 1 second.

Remote shutdown signal is enabled only when the line fails.

3. Front Panel:
The front panel consists 2 parts: push button and display LCD set.The push button is used to
turn on and off the UPS. LCD display indicates the load level,the battery voltage level and
operation status of the UPS.Besides, when the system works abnormally, The LCD will
display the fault code.

Button Function
 Turn on the UPS: Press and hold ON/Mute button for at least 2
seconds to turn on the UPS.
 Mute the alarm: After the UPS is turned on, press and hold this button
ON/Mute Button for at least 5 seconds to disable the alarm system. But it’s not applied
to the situations when warnings or errors occur.
 Down key: Press this button to display previous selection in UPS
setting mode.
 Turn off the UPS: Press and hold this button at least 2 seconds to turn
off the UPS in battery mode. UPS will be in standby mode under
power normal or transfer to Bypass mode if the Bypass enable setting
OFF/Enter Button
by pressing this button.
 Confirm selection key: Press this button to confirm selection in UPS
setting mode.
 Switch LCD message: Press this button to change the LCD message
for input voltage, input frequency, battery voltage, output voltage and
output frequency. It will return back to default display when pausing
Select Button for 10 seconds.
 Setting mode: Press and hold this button for 5 seconds to enter UPS
setting mode when UPS is off.
 Up key: Press this button to display next selection in UPS setting
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 mode.

 Switch to bypass mode: When the main power is normal, press

ON/Mute + Select ON/Mute and Select buttons simultaneously for 5 seconds. Then UPS
Button will enter to bypass mode. This action will be ineffective when the
input voltage is out of acceptable range.
 Switch to UPS self-test mode: Press ON/Mute and OFF/Enter buttons
ON/Mute +
simultaneously for 5 seconds to enter UPS self-testing while in AC
OFF/Enter Button
mode, ECO mode, or converter mode.

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 IV. ALIGNMENTS
List below are some test points and procedures when a qualified service person wants to check
whether EUT (Equipment Under Test) will works properly. Before beginning following
procedures, please make sure that EUT is OFF and disconnected from Utility.

TEST ITEM TEST POINT TEST AND ADJUSTMENT EXPECTED

SEQUENCE RESULT
1. Disconnect P5(+) and P8(-)
wires from pins respectively. 1. Cooling fans on
Charger P5/P6/P9(+)、 2. Connect DVM (set to back panel begin
Voltage P7/P8/P10(-) measure DC) to test pins and to rotate.
plug input power cord to 2. 41.4Vdc±0.9V
utility.
1. Connect DVM (Set to
+DC Bus measure DC) to test point.
HS3/HS4(+)、
Voltage @ Line P7/P8/P10(GND) 2. Plug input power cord to +360VDC±10V
Mode utility.
3. Press “ON” button for 2
seconds to turn EUT on.
4. Waiting for 10 seconds to
-DC Bus HS1/HS2(+)、 make sure the EUT work in
Voltage @ Line P7/P8/P10(GND) line mode according to the -360VDC±10V
Mode LCD display.
5. Check reading on DVM.
1. Disconnect I/P power cord
+DC Bus from utility and press “ON”
HS3/HS4(+)、
Voltage @ button for 2 seconds to turn +360VDC±10V
P7/P8/P10(GND)
Baterry Mode the EUT ON.
2. Connect DVM (Set to
-DC Bus measure DC) to test point.
HS1/HS2(+)、 3. Waiting for 4 seconds to -360VDC±10V
Voltage @ P7/P8/P10(GND)
Baterry Mode make sure the ETU word in
baterry mode.
1. Keeping UPS on @ Line
O/P DC mode.
Balance @ O/P socket 2. Connect DC measurement 50mV max.
Line Mode tool 1 to O/P socket.
3. Check reading on DVM.

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 Figure 9 : Circuit for test output balance

V. TROUBLE SHOOTING

Due to careful design and strict tests of our products, fail of UPS seldom occurs. However,
once they do fail in some situations, please check them according to Trouble Shooting Chart,
that will help you solve the most problems on UPS.

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Trouble Shooting Chart

Panel LCD Display Explanation

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Display Function
Backup time information
Indicates the backup time in pie chart.
Indicates the backup time in numbers.
H: hours, M: minute, S: second
Fault information
Indicates that the warning and fault occurs.
Indicates the warning and fault codes, and the codes are listed in
details in 3-5 section.
Mute operation
Indicates that the UPS alarm is disabled.
Output & Battery voltage information
Indicates the output voltage, frequency or battery voltage.
Vac: output voltage, Vdc: battery voltage, Hz: frequency

Load information
Indicates the load level by 0-25%, 26-50%, 51-75%, and 76-
100%.

Indicates overload.
Indicates the load or the UPS output is short circuit.
Programmable outlets information
Indicates that programmable management outlets are working.
Mode operation information
Indicates the UPS connects to the mains.

Indicates the battery is working.

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 Indicates the bypass circuit is working.

Indicates the ECO mode is enabled.

Indicates the Inverter circuit is working.

Indicates the output is working.

Battery information
Indicates the Battery level by 0-25%, 26-50%, 51-75%, and 76-
100%.

Indicates the battery is fault.

Indicates low battery level and low battery voltage.
Input & Battery voltage information
Indicates the input voltage or frequency or battery voltage.
Vac: Input voltage, Vdc: battery voltage, Hz: input frequency

LCD display wordings index

Abbreviation Display content Meaning
ENA Enable
DIS Disable
ESC Escape
HLS High loss
LLS Low loss
BAT Battery
CF Converter
EP EPO
FA Fan
TP Temperature
CH Charger

UPS Setting

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 There are three parameters to set up the
Parameter 1
UPS.
Parameter 1: It’s for program
alternatives. There are 8 programs to set
up: output voltage setting, frequency
converter enable/disable, output
frequency setting, ECO enable/disable,
ECO voltage range setting, Bypass
enable/disable, Bypass voltage range
setting, programmable outlets
enable/disable, programmable outlets
Parameter 2 Parameter 3
setting and exit.

 01: Output voltage setting

Interface Setting
For 208/220/230/240 VAC models, you may choose the
following output voltage:
208: presents output voltage is 208Vac
220: presents output voltage is 220Vac
230: presents output voltage is 230Vac
240: presents output voltage is 240Vac
For 110/150/120/127 VAC models, you may choose the
following output voltage:
110: presents output voltage is 110Vac
115: presents output voltage is 115Vac
120: presents output voltage is 120Vac
127: presents output voltage is 127Vac

 02: Frequency Converter enable/disable

Interface Setting
CF ENA: converter mode enable
CF DIS: converter mode disable

 03: Output frequency setting

Interface Setting
You may set the initial frequency on battery mode:
BAT 50: presents output frequency is 50Hz
BAT 60: presents output frequency is 60Hz
If converter mode enable, you may choose the following
output frequency:
CF 50: presents output frequency is 50Hz
CF 60: presents output frequency is 60Hz
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 04: ECO enable/disable
Interface Setting
ENA: ECO mode enable
DIS: ECO mode disable

 05: ECO voltage range setting

Interface Setting
Press the Down key or Up key to set the acceptable high
voltage point and acceptable low voltage point:
HLS: High loss voltage in ECO mode (For
208/220/230/240 VAC models, the setting range is from
+7V to -24V of the nominal voltage. For 110/115/120/127
VAC models, the setting range is from +3V to -12V of the
nominal voltage).
LLS: Low loss voltage in ECO mode (For 208/220/230/240
VAC models, the setting range is from -7V to -24V of the
nominal voltage. For 110/115/120/127 VAC models, the
setting voltage is from +3V to -12V of the nominal
voltage)
 06: Bypass mode enable/disable
Interface Setting
ENA: Bypass mode enable
DIS: Bypass mode disable

 07: Bypass voltage range setting

Interface Setting
Press the Down key or Up key to set the acceptable high
voltage point and acceptable low voltage point:
HLS: Bypass high voltage point
LLS: Bypass low voltage point
For 208/220/230/240 VAC models:
230-264: setting the high voltage point from 220Vac to
264Vac
170-220: setting the low voltage point from 170Vac to
220Vac
For 110/115/120/127 VAC models:
120-132: setting the high voltage point from 120Vac to
140Vac
85-115: setting the low voltage point from 85Vac to
115Vac
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 08: Programmable outlets enable/disable
Interface Setting
ENA: Programmable outlets enable
DIS: Programmable outlets disable

 09: Programmable outlets setting

Interface Setting
0-999: setting the backup time limits in minutes from 0-
999 for programmable outlets which connect to non-
critical devices on battery mode.

 00: Exit setting

Operating Mode Description

Operating mode Description LCD display
Online mode When the input voltage is within
acceptable range, UPS will provide pure
and stable AC power to output. The UPS
will also charge the battery at online
mode.
ECO mode Energy saving mode:
When the input voltage is within voltage
regulation range, UPS will bypass
voltage to output for energy saving.

Converter mode When input frequency is within 40 Hz to

70 Hz, the UPS can be set at a constant
output frequency, 50 Hz or 60 Hz. The
UPS will still charge battery under this
mode.

Battery mode When the input voltage is beyond the

acceptable range or power failure and
alarm is sounding every 4 second, UPS
will backup power from battery.

Bypass mode When input voltage is within acceptable

range but UPS is overload, UPS will
enter bypass mode or bypass mode can
be set by front panel. Alarm is sounding
every 10 second.

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 Standby mode UPS is powered off and no output
supply power, but still can charge
batteries.

Faults Reference Code

Fault event Fault code Icon Fault event Fault code Icon
Bus start fail 01 x Inverter voltage Low 13 x
Bus over 02 x Inverter output short 14
Bus under 03 x Battery voltage too high 27
Bus unbalance 04 x Battery voltage too low 28
Inverter soft start fail 11 x Over temperature 41 x
Inverter voltage high 12 x Over load 43

Warning indicator
Warning Icon (flashing) Alarm
Low Battery Sounding every second
Overload Sounding twice every second
Battery is not connected Sounding every second
Sounding every second

Over Charge

Site wiring fault Sounding every second

EPO enable Sounding every second

Fan Failure Sounding every second
Over temperature Sounding every second
Charger failure Sounding every second
Out of bypass voltage range Sounding every second

Failure Diagnosis

1. OVERVIEW :
Circuit Block Components to be checked Fail condition

FUSE F1,F2,F3 short or open

U.P.F. CORRECTION D10, D11,REC1,Q1 short or open
Push-Pull Booster Q2,Q3,Q4,Q6 D-S short or open
D15,D16, D17, D18 short or open
Inverter Q7,Q8 D-S short or open

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Charger Q3 D-S short or open
D3,D5 short or open
DC Power Supply Q2 D-S short or open
2. U.P.F. CORRECTION:
Step Checked components Instrument Reference Value Failed condition
function
1 F1 Ω short open

2 Q1 (D,S) DIODE 0.46 short or open

3 D10, D11 DIODE 0.44 short or open
4 R18 Ω 47 open or value
change
5 REC1(+,～ ),(～ ,-) DIODE 0.46 short or open

3. PUSH-PULL DC-DC CONVERTER:

Step Checked components Instrument Reference Value Failed condition
function
1 F2,F3 Ω short open

2 Q2,Q3,Q4,Q6 (D,S) DIODE 0.47 short or open

3 R31, R32, R54, R56 Ω 10 open

4 D15,D16, D17, D18 DIODE 0.41 short or open

4.DC/AC INVERTER:
Step Checked components Instrument Reference Value Failed condition
function
1 F1,F2,F3 Ω short open

2 Q7,Q8 (D,S) DIODE 0.47 short or open

3 R64, R70 Ω 47 Ω open

5.DC POWER SUPPLY :

Step Checked components *Instrument Reference Value Failed condition
function
1 Q2(D,S) DIODE 0.47 short or open
2 R18 Ω 22 open
3 R104 Ω 0.22 open

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 4 Ω >1M too low
U1 (3845) PIN ： 5-6
>1M
5-7
3.5k
5-8
>1M
6-8

6. AC/DC CHARGER :
Step Checked components Instrument Reference Value Failed condition
function
1 Q3(D,S) DIODE 0.49 short or open
2 R6 Ω 47 open
3 R37 Ω 0.5Ω open

4 45k too low

U3(3845) PIN ： 5-6
>1M
5-7 Ω
3.5k
5-8
53.5k
6-8
5 D2, D3, D5 DIODE 0.57 short or open
6 C1, C2 Ω open short
visual deformed

After you have replaced all defect components on power stage ( PSDR ) , connect with
control board. Supply DC voltage36Vdc/2Amp (limited current) with DC power supply via
P5+ and P8-. Turn on the switch on panel, you will see "current limit" on the DC power supply
for about 2 seconds (If not, there are some defective components you have not found).

When everything seems good, turn off the switch on panel and remove DC power supply.
Plug in the power cord and supply UPS with the mains. Test the output of charger( P5+,P6- ).
Is it 41.2Vdc.The fan will also active. If there is no problem in charger, connect the batteries
via P5, P8.

Finally, turn on the switch on panel again and follow the procedure listed in part Ⅲ
(Alignment) to adjust the DC offset, and measure voltage on DC bus, output voltage.

CAUTION： DO NOT supply UPS with the mains unless you are sure that you have replaced
all defective components

APPENDIX I: ENGINEERING SPEC.

I/P Specification
Cold Start Yes, default frequency = 50 Hz
Acceptable Input Voltage 0-300 VAC
Low line transfer 160VAC; 5% (Full Load)

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 Line low comeback 175 VAC; 5%(Full Load)
Line high transfer 300 VAC; 5%
Line high comeback 285 VAC; 5%
Start-up Voltage with Output 110 VAC to 300 VAC; 5%
Power
Ratings (at nominal input voltage) 1000/1500 5A/8A
earth leakage 3.5 mA, maximum (UPS only)
Input power factor > 0.95
Input frequency 40 Hz to 70 Hz
Input protection type circuit protector

O/P Specification
O/P Power
Power (VA) 1000 / 1500
Power (Watts) 800 / 1200
Output Power Factor Rating 0.8
Load Power Factor Range 0.5 lagging to 1.0 (unity)
Output Voltage 208/220/230/240
Waveform Sinusoidal
Nominal Voltage 230 VAC
Line Mode Voltage Regulation 3% of nominal; no load to full load, resistive &
RCD loads
Battery Mode Voltage Regulation 3% of nominal; no load to full load, resistive &
RCD loads
Transient Response 0%-100%-0%; 9% max.
(line mode) 20%-100%-20%; 6 % max.

APPENDIX II: COMMUNICATION

1. RS232 PORT
The RS232 provides proprietary command sequence for the computer to monitor the line and
UPS status and to control the UPS. The data format is listed as following:
PIN TYPE ...................: female
BAUD RATE .............. : 2400 bps
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 DATA LENGTH ......... : 8 bits
STOP BIT ................... : 1 bit
PARITY ...................... : NONE
The pin assignment and description are listed in the following table and the interface
configuration is indicated in figure VI-1. Note that, the computer will control information
exchange by a query followed by <cr> (Character Return). UPS will respond with information
followed by a <cr> or action. UPS data will be provided at 2400 baud rate and consist of 8 data
bits, 1 stop bit, and no parity bit. All the information is provided in ASCII format.

PIN # Description I/O type

1,4,6,7,8,9 not connecteed
3 UPS RS232 receiver Rx from computer. input
2 UPS RS232 transmitter to computer output
5 GND

2.USB PORT
The USB is compatible to USB1.1 specification, and implemented for HID device and bus-
powered.
The USB connector is "B" receptacles, seeing the following figure . The following table is signal
definition of USB interface.

PIN# SIGNAL
1 VBUS
2 D-
3 D+
4 GND

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