Ablerex 3 MS series User manual

1
Table of Content Page
General Introduction Guide
1.1. General Introduction 2
1.2. System Layout and Description 4
1.2.1.Front Panel and Rear Panel Layout 4
1.2.1.1. Front Display Panel Explanation 4
1.2.1.2. Rear Panel Explanation 5
Chapter 1:
1.3. Communication Port Explanation 6
System Block Diagram
2.1. PC Boards and Their Functions Explanation 7
2.2. Control Logic Board Block Diagram 7
2.3. Driver Board Block Diagram 8
Chapter 2:
2.4. Display Board Block Diagram 8
Field Calibration Guide
3.1. Introduction 9
3.2 Tools Required. 9
3.3. Technical Data 9
3.4. Test Point Default Value 10
3.5. Jumper Functions Explanation 10
3.6 VR Calibration and Setting Procedure 10
Chapter 3:
3.7 VR Calibration and Switch Setting Procedure 11
MS1K Troubleshooting Guide
4.1. Utility is Normal, but UPS on Battery Mode 13
4.2. Fault LED Lights up and No Output 14
4.3. Input Fuse is Burnt 16
4.4. UPS Fails to Backup when Blackout 17
4.5. No LEDs and No Output 18
4.6 Main Switch off, the Fan Still Working When
Utility Is Removed 19
Chapter 4:
4.7. Quick Trouble Shooting Guide 20
MS2K Troubleshooting Guide
5.1. Utility is Normal, but UPS on Battery Mode 21
5.2. Fault LED Lights up and No Output 22
5.3. Input Fuse is Burnt 24
5.4. UPS Fails to Backup when Blackout 25
5.5. No LEDs and No Output 26
5.6.Main Switch off, the Fan Still Working When
Utility Is Removed 27
Chapter 5:
5.7. Quick Trouble Shooting Guide 28
MS3K Troubleshooting Guide
6.1.Utility is Normal, butups on Battery Mode 29
6.2.Fault LED Lights up and No Output 30
6.3.Input Fuse is burnt 32
6.4.ups Fails to Backup When Blackout 33
6.5.No LED and No Output 34
6.6.Main Switch off ,Remove Utility, the Fan is still Working
35
Chapter 6:
6.7.Quick trouble shooting 36
a.1.Wiring Diagram 37
Appendix a.2. Placements 41

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Chapter One: General Introduction Guide
1.1. General Introduction
The Smart Mars MS high frequency on-line UPS series, adopting 50KHz
High-frequency topology and integrating with micro-processor based central
Control circuit and smart RS232 communication, offers extremely high industrial
Grade protection, user-friendly interface for a wide range of application.
1.1.1. The General Characteristics
•True online architecture continuously supplies in your critical device with
a stable, regulated, transient-free pure sine-wave AC Power.
•50KHz PWM sine-wave topology yields an excellent overall performance.
•The high crest factor of the inverter handles all high-inrush current
loads without a need to upgrade the power rating.
•To protect the unit from overloading, it automatically switches to bypass mode in case loading exceeds 120%
of rating. It will automatically switch back to inverter mode once overload condition ceases.
•Should the output becomes short-circuited, the UPS holds the system
and cuts the output automatically till the short circuit situation is removed.
•Should the unit become overheated, the internal thermistor will detect
the heat and switch to bypass mode and vice versa.
•Maintenance-free sealed-type battery minimizes after-sales service.

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1.1.2. The Advanced Technical Characteristics
lMarket leading light and compact design for modern OA environment and
OEM flexibility.
lPowerful CPU integrates all power stages, control and communication functions necessary for maximized
UPS protection and functionality, including
Power management status monitoring, configuration setting operation
Scheduling, remote control and self-diagnosis.
lSlick CPU communication design allows full function remote control from any
computer environment via standard RS-232 interface using Megatec’s
RUPSII protocol.
lState-of-the-Art IGBT Technology and Industrial Grade quality ensures
Highest efficiency and reliability under worst operating condition.
lIndustry lading inverter protection technology incorporates 2-stage output
Current sensor, smart overload output current control, improved crest factor,
and feedback failure proof circuit, elevating the availability of power service.
lGuarantees an exclusive protection against DC damage for inductive load,
Such as motor based devices, entirely eliminating application limitation.
lAdvanced Input PFC control guarantees the PF performance and maximum
energy efficiency.
lUnique electronic over-current protection detects output short-circuit and
faults, and halts output before damages done to output fuse or equipment,
thereby minimizing the need for service.
lExpanded input voltage working range minimizes battery usage and
enhances battery utilization and life.
lAutomatic Frequency Sensor reduces headache in frequency shift.
lDC-start function makes sure of the start-up of UPS during power outages.
lOn-demand self-diagnosis function ensures UPS reliability and availability.
lBuilt-in supplementary charger enables speediest charging of external battery
Bank.
lSNMP adapter slot represents the advanced upgrade solution to achieve
direct power management via internet world-wide.
lUser's adjustable Output DIP switches allow you to select an accommodate
Output voltage for your critical device.

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1.2. System Layout and Description
1.2.1. Front Panel and Rear Panel Layout
1.2.1.1. Front Panel Explanation
1. Main Switch This is control the on/off of the UPS
2. Self Test OK LED Green LED lights up if self test is O.K.
3. Test/Silence a. To silence alarm by pressing the button.
b.1.For Standard Unit
To execute the self test of the UPS by pressing
the button over 10 sec.
b.2.For Unit with Manual Bypass function
(Special order required)
To press the button over 5 seconds, the UPS will
be switched to Bypass mode and vice versa.
c. To illustrate the percentage of output load level at
AC Mode, and the battery energy level at Backup
Mode by pressing the button.
4. Fault LED Red LED lights up if UPS is faulty.
5. Inverter LED a. Inverter On: Green LED light up
b. 75% for load & battery level.
6. Utility LED a. AC normal: Green LED lights up.
b. 100% for load & battery level
7. Bypass LED Amber LED lights up when UPS is in Bypass mode.
8. Battery low LED a. Battery low :Red LED lights up
b. 50% for load & battery level
9. Over load LED a. Over load condition: Red LED lights up
b. 25% for load & battery level.
10. Load Level LED’sPush the Test/Silence button for few seconds when Utility
is normal, the LED’
s combined by Utility, Inverter, Battery
Low, Overload LED’s will show you the load percentage
connected.
11.
Battery Level LED’sPush the Test/Silence button for few seconds when Utility
Is abnormal, the LED’s combined by Utility, Inverter,
Battery Low and Overload LED’s will show you the
percentage of the battery energy left.

5
1.2.1.2. Rear Panel Explanation
1)
AC Inlet
This is to be connected with an AC power cord for plugging into
the wall receptacle.
This is to disconnect line input to protect application from Output
overload or short circuit.
Fuse Rating for120Vac
MS1K/MS1KR MS2K/MS2KR MS3K/MS3KR
20A/250V 25A/250V 50A/250V
Fuse Rating for 230Vac
MS1K/MS1KR MS2K/MS2KR MS3K/MS3KR
2) AC Input
Fuse
10A/250V 15A/250V 25A/250V
3) External
Battery
Terminal
This is a battery terminal to be connected with additional battery
banks for longer backup time purpose. Only a qualified technician
is permitted to proceed the installation.
This is to be plugged by the devices being protected by the UPS.
Socket Type MS1K/MS1KR MS2K/MS2KR MS3K/MS3KR
4) AC Outlet
(for230Vac)
IEC 3pcs 3pcs N/A
3
1
1
2
2
2
3
3
4
4
4
4
5
5
5
6
6
6
7
7
7
1
8
8
8
1KVA 2KVA 3KVA
RACK 1KVA
RACK 2KVA
RACK 3KVA

6
Local Sockets 1pce 2pcs 2pcs
Terminal Block N/A N/A Terminal
Socket Type MS1K/
MS1KR MS2K MS2KR MS3K/MS3KR
NEMA5-15R 4pcs 4pcs 2pcs N/A
NEMA5-20R N/A 1pce 1pce N/A
NEMA5-30R N/A N/A N/A 1pce
AC Outlet
(for120Vac)
Terminal Block N/A N/A N/A Yes
5)
SNMP Slot It is an optional feature used for SNMP card.
6)Comm Port
This is an interface to send signals to and receive signals from the
computer. An optional computer software may be required.
7) RJ11/RJ45
Jack This is to offer you a modem/internet (RJ11) and 10-
Base T
Network(RJ45) protection against line interference.
1.
For early version of CPU, Setup the output voltage according to
the table below.
Dip
Vac 34
100V/200Vac Off On
110V/220Vac Off Off
115V/230Vac On Off
120V/240Vac On On
8) DIP Switches
2. For new version of CPU, the DIP Switc
h can be used for
Calibration only. Not for output voltage selection.
1.3. Communication Port Explanation
The communication port on the rear panel of the UPS is a true RS232
serial type. It may be connected to a computer and allows the computer
to monitor the status of UPS, and controls the operation of the UPS, via
an additional UPS software kits. The bundled software of the UPS is for
Windows environment, such as Windows 3.1, Windows 95 & 98,
Windows NT. For other applications, such as Novell NetWare, Unix,
etc., please contact your local distributor for a proper solution.
1.3.1. The RS232 interface settings
The RS232 interface shall be set as follows:
Baud Rate : 2400 bps
Data Length : 8 bits
Stop Bit : 1 bit
Parity : None
1.3.2. The Pin Assignments of true RS232 type
The Pin Assignments of true RS232 type are illustrated as follows:

7
1
2
3
4
5
6
7
8
9
Pin 6: RS232 Rx
Pin 9: RS232 Tx
Pin 7: Ground

8
Chapter Two: System Block Diagram
Basically, the Mars MS series are composed of Logic Board, Driver Board,
And Display Board.
2.1. PC Boards and Their Functions Explanation
The Mars MS series is composed of three major boards, of which functions are
Explained as follows:
Item Board Part No. Main Functions
1. Control Logic MS1K, MS2K & MS3K:
MSI9919-x或MSAIxxx
Control Logic Circuit, Sine Wave
Generator , Detecting & protection
feedback circuit and communication
circuit.
2. Driver MS1K:MS-D9917-x
MSADxxx
MS2K:MS-D9910-x
MSBDxxx
MS3K:MSCD0xx
MSCDxxx
Charging circuit, UPS Working Source
Circuit, Input Power Factor Correction
Circuit, DC to AC Converter circuit,
and DC Booster circuit.
3. Display MS-M9920-x Circuits for LED indicators
2.2. Control Logic Board Block Diagram
The main circuit of Logic board is simply separated into Twelve major
Sections as shown in the below, which mainly include AC Input & Inverter Phase
Detect circuit, Phase Lock Loop(PLL) circuit, PWM Generator Loop, Output
Current Limit circuit, Short Circuit Detect circuit, Feed Back Fault Detect circuit,
Inverter Over-current detect circuit, Battery Voltage detect circuit, Output current
Detect circuit, AC input Blackout circuit, and Communication Interface circuit.
A block diagram is illustrated as follows:
PFC
AC/DC
INVERTER
DC/AC
BOOST
DC/DC
CHARGER
BATTERY
Control
Circuit

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2.3. Driver Board Block Diagram
The circuitry of Driver Board can mainly divided into five sections. They are Charger
circuit, UPS System Source Circuit, Input Power Factor Correction Circuit, DC to AC
Converter Circuit and DC Booster circuit. A block diagram is illustrated as follows:
2.4. Display Board Block Diagram
The circuitry of Display board can mainly be divided into two sections; one
is the display of LED and the other is the function keys. A block diagram is illustrated
as follows:

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Chapter Three: Field Calibration Guide
3.1. Introduction
There are several variable resistors(SVR or potential-meter) and jumpers
on the PCB. They are used for the adjustments of set points which vary
from different electrical applications.
3.2.Tools Required
Tools Description
1. AC Source : To offer an input power 100/110/120 or
220/230/240Vac to the UPS.
2. Multi Meter : To measure the Input Voltage and Battery Voltage
of the UPS
3. Power Meter : To measure the Output Voltage and Output Power
of the UPS.
4. Resistance Load : Bulb Fixture(700W/1400W/2100W)
5. Screw Driver : flat-type, cross-type
3.3. Technical Data
3.3.1. Battery Charging Voltage(25 C)
Set point
Model Battery Charging Voltage
1. MS1K 41.4VDC +/-0.5V
2. MS2K 82.8VDC +/-0.5V
3. MS3K 110.4VDC +/-1.2V
3.3.2. Setpoints for Battery Low and Battery Cutoff
Model Battery Low Battery Cutoff
1. MS1K 32.4V +/-0.5VDC 28.8+/-0.5VDC
2. MS2K 64.8V +/-0.5VDC 57.6V +/-0.5VDC
3. MS3K 86.4V +/-0.5VDC 76.8V +/-0.5VDC
3.3.3. Fuse Rating(for Standard Models)
Model No.# MS1K/MS1KR MS2K/MS2KR MS3K/MS3KR
DC Fuse 40A/20A*2 20A*2 20A*2
AC Fuse for
230Vac 10A/250V 20A/250V 25A/250V
AC Fuse for
120Vac 20A/250V 25A/250V 50A/250V

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3.4. Test Point Default Value
a. Control Logic Board: MS-I9919-x
Jumper Functions
JP1 Reserved
JP2 Reserved
JP3 Output Voltage Calibration
JP4(Default: Open for Internal Charger) Internal/External Charger Selection
JP5 Reserved
Driver Board:
1K(MS9917-
X) 2K(MSBD- X) MS3K(MSCD- x)Functions
JP1 JP2 JP1 Manual PFC Start-on Switch
JP2 JP1 JP3 Over-temperature Protection
JP3 JP3 JP2 Manual DC Booster Switch
3.5. Jumper Functions Explanation
a. Control Logic Board: MS-I9919-x
Jumper Functions
JP1 Reserved
JP2 Reserved
JP3 Output Voltage Calibration
JP4(Default: Open for Internal Charger) Internal/External Charger Selection
JP5 Reserved
Driver Board:
MS-D9917-x for 1K
& 2K MSCD0xx for 3K Functions
JP1 JP1 Manual PFC Start-on Switch
JP2 JP3 Over-temperature Protection
JP3 JP2 Manual DC Booster Switch
3.6. Channel Function Explanation
Driver Board
MS1K MS2K MS3K Function
CN1 CN3 CN3 Connection with Logic Board
CN2 CN4 CN4 To Main Switch
CN3 CN1, CN2 CN1, CN2 To Fan
CN4 CN10 CN6 To the negative part of battery
CN5 CN9 CN5 To the positive part of battery
CN6 CN8 CN10 O/P Line
CN7 CN6 CN8 I/P AC Source Line
CN8 CN5 CN7 1.I/PAC Source Neutral
2.External Charger I/P Neutral
CN9 CN7 CN9 O/P Neutral
CN10 CN6 CN8 External Charger I/P Line
CN11 Reserved

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3.7 VR Calibration and Switch Setting Procedure
3.7.1 VR/Switch Function Explanation
3.7.1.1 VR Function Explanation
VR
Adjustment
MS1K(R)/2K(R)/3K(R)
A. Logic Board: MS-I9919-x
O/P Voltage Balance VR1
Output Voltage Selection SW1
CPU Reset SW2
B. Driver Board: MSD9917-x or MSADxxx for 1K; MSD9910-x or
MSBDxxx for 2K; MSCDxxx for MS3K
Charger Output Voltage VR1
3.7.2. Setting Procedure
3.7.2.1. Equipment Installation
Please connect the equipment mentioned in 3.2. as the drawing
Shown in the below:
I/P
BATT
O/P
POWER
METER RES
LOAD
DC
SOURCE
AC
SOURCE
METER METER

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3.7.2.2. Setting Procedure for EARLY version of CPU ( MS01013F 、 MS03014B and those before MS0731)
1. Short the JP3 of the control board by jumper cap. Do Not Connect Battery.
2. Add 110V/60Hz or 220V/50Hz and Adjust Charger Voltage: 41.4V for MS1K/MS1KR, 82.8V for
MS2K/MS2KR and 110.4V for MS3K/MS3KR. (Important:The input voltage must be precisely110V/60Hz
or 220V/50Hz)
3. Switch on the front switch of the UPS and adjust the output voltage to
Desired one. To decrease or increase the voltage, please follow the chart below:
Output Voltage Adjustment DIP SW1 DIP SW2 DIP SW3 DIP SW4
Decrease O/P Voltage OFF OFF OFF OFF
Increase O/P Voltage OFF ON OFF OFF
Remarks: to enable the adjustment, please push the Test Switch to
Increase or decrease the voltage till the desired one.
4. Set the DIP SW1 ON and DIP SW2 OFF, then add a resistance load
Of 700W, 1400W and 2100W for MS1K/MS1KR, MS2K/MS2KR,
And MS3K/MS3KR respectively. Read the input voltage and battery
Voltage from the multi-meters connected to see whether they are at
The desired 110Vac or 220Vac and 41.4V/82.8V/110.4Vac.
5. Then, push the Test Switch to see whether the voltage setting is done Successfully.
Tolerance of Input Voltage CPU Action Setup Condition
CPU Read Value <10% CPU automatically adjusts and
Buzzer beeps twice.
Success
CPU Read Value>10% Buzzer beeps continuously Failure
Remarks: If the setup is in failure, you shall proceed the adjustment all over again
Or return for repair.
6. Switch off the UPS and remove the jumper cap from the JP3.
7. To choose the model type and output voltage, adjust the DIP Switch 3-4 at the rear part of logic
board , following the tables below:
Voltage 100/200Vac 110/220Vac 115/230Vac 120/240Vac
DIP-SW3 OFF OFF ON ON
DIP-SW4 ON OFF OFF ON
8. In most of cases ， The Calibration Procedure is NOT nessary, even after replace CPU and Logic Board.
9. For a UPS already been set, when doing procedure 4, the load is not necessary.

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3.7.2.3. Setting Procedure for NEW version of CPU
1.Short the JP3 of the control board by jumper cap. Do Not Connect Battery.
2.Add 110V/60Hz or 220V/50Hz and Adjust Charger Voltage: 41.4V for MS1K/MS1KR, 82.8V for
MS2K/MS2KR and 110.4V for MS3K/MS3KR. (Important:The input voltage must be precisely110V/60Hz or
220V/50Hz)
3.Software Setting(This part is not nessary if the UPS already been set) 。
4.Switch on the front switch of the UPS and adjust the output voltage to
220V/110V. To decrease or increase the voltage, please follow the chart below:
Output Voltage Adjustment DIP SW1 DIP SW2 DIP SW3 DIP SW4
Decrease O/P Voltage OFF OFF OFF OFF
Increase O/P Voltage OFF ON OFF OFF
Remarks: to enable the adjustment, please push the Test Switch to
Increase or decrease the voltage till the desired one.
5.Set the DIP SW1 ON and DIP SW2 OFF, then add a resistance load
Of 700W, 1400W and 2100W for MS1K/MS1KR, MS2K/MS2KR,
and MS3K/MS3KR respectively. (For an UPS already been set, the load is not nessary)
Read the input voltage and batteryVoltage from the multi-meters connected to see
whether they are at the desired 110Vac or 220Vac and 41.4V/82.8V/110.4Vac.
6.Then, push the Test Switch to see whether the voltage setting is done Successfully.
Tolerance of Input Voltage CPU Action Setup Condition
CPU Read Value <10% CPU automatically adjusts and
Buzzer beeps twice.
Success
CPU Read Value>10% Buzzer beeps continuously Failure
Remarks: If the setup is in failure, you shall proceed the adjustment all over again
Or return for repair.
7.Switch off the UPS and remove the jumper cap from the JP3.
8.In most of cases ， The Calibration Procedure is NOT nessary, even after replace CPU and Logic Board.
9.For the new versions of CPU, output voltage is selected by software(step 3).

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Chapter Four: Trouble Shooting Guide For MS1K
4.1. Utility is Normal, but UPS on Battery Mode
FIG. 4.1
Check Items Trouble-shooting
Utility Voltage is out of windows(<80Vac or
>140Vac for 120Vac system;160Vac or >280Vac
for 230Vac system)
Your Utility quality is too bad. You are
recommended to install an AVR in front of the
UPS.
Input AC fuse is broken. Replace a new fuse with same rating one.
Input Power Cord is loose in connection. Please re-connect the loose Input Power Cord
properly back to its position.
Input detecting circuit is out of
order. Please check
whether the U1(LM324) or
D1(1N4148) Of MS-D9917-x are defective.
Over-voltage Trip-off circuit is out of order.
1.Refer to fig4.1. Please check those items of
MS-D9917-x Boards are defective:
2. The transformer T3 is open.
3. C69 is 11-13V?
4. D34, and Relay K1

16
4.2. Fault LED Lights up and No Output
4.2.1. Troubleshooting
FIG. 4.2
Check Items Trouble-shooting
Output Short Circuit Check if the output end of the UPS is in short
circuit.
Overload(>120%)
Reduce the output load. MS1K/MS1KR: 1000VA/700W
Battery voltage is abnormal 1.If the battery voltage is under 28.8V, replace the batteries。
2.Remove the battery, check the charge voltage. If the voltage
is over 43V, the charger circuit is out of order. Refer to fig4.1,
please check U14、U10、VR1 and other device nearby.
INVERTER Voltage ERROR Refer to fig.4-4, Check U7、U8、Q13、Q14 。
The Fan on the rear panel is out of
order 1. Check to see if the connection to the fan is Properly done.

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2. Connect 12Vdc t o the Fan(red line to positive) to check if
the fan is normal.
3. Otherwise, please check the related circuit as
fig 4-2.
Environmental Temperature is out of
windows(
Over 40 degree C)
Improve the ventilation and reduce the temperature of the
environment.
BUS Voltage abnormal The PFC conrtrol IC U2 or the Booster control IC U9 may be
abnormal.
The feedback signal to CPU is
abnormal. 1. Check if the connection between the control Board and the driver board is properly done.
2.Check if pin1 of U5(HA17393) of the driver board is sending
out a square wave of Utility frequency.
4.2.2.Fault Status Analysis
When the Fault LED lights up, you may know which part of the UPS is out of order by
Pushing the Test Switch in front.
Utility Inverter Battery Low Overload Symptom
0 0 0 1 Short Circuit
0 0 1 0 Inverter Over-current
0 0 1 1 Battery Voltage Abnormal
0 1 0 0 Inverter Voltage Abnormal
0 1 0 1 Heat Sink Overheat
0 1 1 0 DC Bus Fault
p.s. A code composed by Utility, Inverter, Battery Low and Overload LEDs may indicate the possible
fault conditions by pushing the Test Switch button in front.

18
4.3. Input Fuse is burnt
FIG. 4.3
Check Items Trouble-shooting
The IGBT of Inverter Stage is out of order 1. Check the related circuit as shown in fig.4-4.
Check Q14, Q13, D24, D25, R118 and R120
are defective. If Q14、
Q13 is abnormal, U7,U8
need to be replaced, too.
2. Check Q12, U6、BD1 in PFC circuit (fig4-3).
If Q12 is abnormal, replace both U6 and Q12.
3. Check D30-D33, Q15-Q20 and U9, refer to
fig.4-5.
UPS Output Short Circuit or Overload Remove the output load. If the UPS works
Normally, it means the output load connected is
in short circuit or overload.
PFC is abnormal 1. Check the related circuit as shown in fig.4-3.
2.
Check if the PFC driving IGBT 20N60(Q12) and
the photo coupler IC PC923( U
6) are abnormal.

19
4.4. UPS Fails to Backup When Blackout
FIG. 4.4
Check Items Trouble-shooting
Battery is weak and no
battery charging urrent
When it is in charging
mode.
Remove the harness of the battery from the control board to measure the b
attery
voltage. If the voltage drops dramatically, please use a switching power supply
to charge the battery. The charging voltage can be set at 43.2Vdc,86.4Vdc,
115.2Vdc for MS1K(R), MS2K(R) and MS3K(R) respectively. The battery shall
be charged up to 80% of its capacity.
Battery is defective Replace the battery with same size.
Battery harness is
loose in connection. The current provided by the battery is approx. 20-30A when it is at full load. Please proceed to check any loose connection.
DC to DC converter is
abnormal and/or the
battery fuse is
defective.
1. Check the related circuit shown in fig. 4-5.
2. Check if Q15-Q20 , D30-D33 of the driver board are defective.
3. Check if the U9 SG3525 is out of order.
4. Check if the Booster Transformer T2 is open.
5.
After replace the defective devices. To make sure the other parts of the UPS is
OK. Disconnect the logic board from driver board. Cut off the Utility.
Provide
36Vdc to CN5(+) and CN4(-
) by a DC Power Supply, connect CN2 to the
main switch. Push on the main switch and to see if DC POWER of UPS, i.
e.
VDD(18-16V), VCC(12V) and +/-5V is normal.
The IC of DC Booster
stage is out of order. 1. Check the related circuit is normal as shown in fig. 4-5. 2. Check if the U9(IC SG3525) is normal. Cut the Utility Source ,
remoe the
battery and remove the control board, add a 36Vdc to CN5 and CN4 and
18Vdc To the pin 15 of U9 and short JP3 and check if the pin 16 of U9 is
5.1V and pulses can be found at Pin 11 and Pin 14 of U9. If not, please
replace the U9.
3. The MosFet (Q15-Q20) and Diode(D30-
D33) maybe abnormal, please check
them.

20
4.5. No LEDs and No Output
FIG. 4.5
Check Items Trouble-shooting
Power Devices defective, AC or DC fuse is burn Please see table 4.3 and 4.4 .
The working voltage of the control board is out
of order. 1. Please check the circuit shown in fig.4-2. 2. Cut off the Utility. Remove the control board.
Supply a 36Vdc to CN5 and CN4 by a DC
Power supply, connect CN2 to the main switch.
Push on the main switch and to see if DC POWER
,
i.e. VDD(17.5V), VCC(12V) and +/-5V is normal.
3. Check if Q1, Q6, Q7, Q25, D11, D12 and U4
Is normal.
4. Check if any abnormal output signal of the U9.
CPU is down. If the DC POWER is normal, the CPU could be
Down. Remove the battery harness from the
UPS and re-connect it back to its position.