Ladis G31 Series User manual

UNINTERRUPTIBLE POWER SYSTEM
SERVICE MANUAL
G31 10K~30KVA Tower Model
REVISION DESCRIPTION Date
Rev. 1.0 Formal Release 2010/4/28
Rev. 2.0 2012/8/9
Rev. 3.0 Add 30KVA unit content 2013/9/4
Rev. 4.0 Add 30KVA safe start section 2013/12/27
Shenzhen LADS Technology Co.,Ltd.

2
CONTENT
1. GENERAL INFORMATION ...............................................................................................................................................4
1.1 GETTING START................................................................................................................................................................4
1.2 IMPORTANT SAFETY INSTRUCTIONS ................................................................................................................................4
2. ELECTRIC SPECIFICATIONS..........................................................................................................................................5
3. FUNCTIONAL BLOCK.......................................................................................................................................................7
4. WORKING PRINCIPLE OF THE MAJOR FUNCTIONAL BLOCK.............................................................................9
4.1 SWITCH POWER SUPPLY .................................................................................................................................................9
4.2 PFC/BOOSTER ................................................................................................................................................................9
4.3 INVERTER.........................................................................................................................................................................9
4.4 CHARGER.......................................................................................................................................................................10
4.5 EMI BOARD....................................................................................................................................................................10
5. FUNCTION EXPLANATIONS FOR EACH PCB..........................................................................................................12
5.1 PFC BOARD (POWER FACTOR CORRECT BOARD).......................................................................................................13
5.2 INV BOARD (INVERTER BOARD)....................................................................................................................................13
5.3 CNTLBOARD (CONTROL BOARD).................................................................................................................................13
5.4 COMM BOARD (COMMUNICATION BOARD)...................................................................................................................13
5.5 CHARGER BOARD...........................................................................................................................................................13
5.6 O/PRELAY BOARD.........................................................................................................................................................13
5.7 POWER RELAY BOARD...................................................................................................................................................13
5.8 COMMUNICATION BOARD ...............................................................................................................................................13
5.9 PARALLEL BOARD...........................................................................................................................................................13
5.10 PANEL BOARD...............................................................................................................................................................13
5.11 EMI BOARD ..................................................................................................................................................................13
5.12 MOV BOARD................................................................................................................................................................14
6. INTERFACE.......................................................................................................................................................................15
6.1 LED DISPLAY.................................................................................................................................................................15
6.2 LCD DISPLAY.................................................................................................................................................................15
6.3 LCD DISPLAY ICON........................................................................................................................................................15
7. TROUBLE SHOOTING....................................................................................................................................................17
7.1 LCD PANEL DISPLAY PATTERN DEFINITION ..................................................................................................................17
7.1.1 Trouble shooting for warning icon in LCD display.................................................................................................17
7.1.2 Trouble shooting for fault codes in LCD display.....................................................................................................19
7.1.3 Trouble shooting......................................................................................................................................................23
7.2 REPAIR ...........................................................................................................................................................................23
7.2.1 Basic Instruments and tools.....................................................................................................................................25
7.2.2 Configuration of the Model pin and Battery number on the Control Board............................................................25
7.2.3 Configuration of the charger current on the charger Board ...................................................................................25
7.2.4 Regulation of the system..........................................................................................................................................26
7.2.5 Quick Start...............................................................................................................................................................27

3
8.HOW TO START UPS SAFELY AFTER REPAIRING OR REPLACING PSDR BOARD.......................................36
8.1 START 10K(L)AND 20K(L) UNIT SAFELY.......................................................................................................................36
8.2 START 30K(L) UNIT SAFELY...........................................................................................................................................50
8.2.1 T est Charger s to make sure they could work fine. .................................................................................................50
8.2.2 Turn on the UPS with DC source ( the charger work as a current limitation DC source) .......54
8.2.3 Turn on the UPS with utility power ..........................................................................................................55
9. APPENDIX .........................................................................................................................................................................56
9.1 REFERENCE WAVEFORM ...............................................................................................................................................56
9.2 BASIC COMMUNICATION COMMAND................................................................................................................................58
9.2.1 QGS.........................................................................................................................................................................58
9.2.2 V<n>.......................................................................................................................................................................59
9.2.3 V±<n>.....................................................................................................................................................................59
9.2.4 BUSP±<n>..............................................................................................................................................................59
9. 2.5 BUSN±<n> ............................................................................................................................................................60
9. 2.6 VB±<n> .................................................................................................................................................................60
9.2.7 QVFW......................................................................................................................................................................60
9.2.8 QWS.........................................................................................................................................................................60
9.2.9 QFS..........................................................................................................................................................................61

4
1. General Information
1.1 Getting start
This manual is for Galleon 10K(L)~30K(L) tower UPS. It can help service person perform the basic
maintenance and repair service.
This manual only focuses on the service section, so you should get the basic operation of the UPS from the
user manual, and make sure you had read and understood the user manual before reading the manual.
The manual includes 9 sections:
●General Information, this section shows you the general information of the service manual.
●Electric Specifications, this section shows you the basic electric specification of the UPS.
●Functional block, this section shows you the major functional block of the UPS.
●Working Principle of the Major Functional Block, this section shows you the working principle of the
major functional block.
● Function explanations for each PCB, this section explains you all the PCBs of the UPS system.
●Interface, this section shows you the LCD interface, including display and setting.
● Trouble Shooting, this section gives you the way to find the problems.
● Test Step, this section tells you how to test the UPS after you repair the unit.
● Appendix, this section shows you the basic waveforms for reference and the basic communication
commands.
1.2 Important Safety Instructions
For qualified service person only.
DO NOT perform any internal service or adjustment of this product unless the technical person is well
trained and experienced. .
Dangerous voltage exists at several points in this product. To avoid personal injury, don't touch any
exposed connections or components while UPS is on.
Turn off the UPS and switch off the input breaker before removing protective case.
AC voltage is always present if the input AC power is still available.
High voltage may exist at DC capacitors. Before removing the protective case, wait for at least five
minutes after turning off the UPS.
Verify input source (voltage and frequency) is within the maximum range before service.

5
2. Electric Specifications
CAPACITY*
10000VA / 8000W
15000VA / 12000W
20000VA / 16000W
30000VA / 24000W
INPUT
Voltage
Range
Low Line Loss
110 VAC(L-N) ± 3 % at 50% Load
176 VAC(L-N) ± 3 % at 100% Load
Low Line Comeback
Low Line Loss Voltage + 10V
High Line Loss
300 VAC(L-N) ± 3 %t 50% Load
276 VAC(L-N) ± 3 % at 100% Load
High Line Comeback
High Line Loss Voltage - 10V
Frequency Range
46Hz ~ 54 Hz @ 50Hz system
56Hz ~ 64 Hz @ 60Hz system
Phase
Three phase with ground
Power Factor
≧0.99 at 100% Load
OUTPUT
Output voltage
208/220/230/240VAC
AC Voltage Regulation
± 1%
Frequency Range
(Synchronized Range)
46Hz ~ 54 Hz @ 50Hz system
56Hz ~ 64 Hz @ 60Hz system
Frequency Range (Batt. Mode)
50 Hz ± 0.1 Hz or 60Hz ± 0.1 Hz
Overload
AC mode
100%~110%: 10min
110%~130%: 1min
>130% : 1sec
Battery mode
100%~110%: 30sec
110%~130%: 10sec
>130% : 1sec
Current Crest Ratio
3:1 max
Harmonic Distortion
≦2 % @ 100% Linear Load; ≦5 % @ 100% Non-linear Load
Transfer
Time
Line Battery
0 ms
Inverter Bypass
0 ms
Inverter ECO
<10 ms
EFFICIENCY
AC mode
> 89%
>89%
>89%
>90%
Battery Mode
> 86%
>88%
>87%
>88%
BATTERY
Standard
Model
Type & Numbers
12 V /9 Ah x 20
12 V / 9 Ah x 40
12 V / 9 Ah x 40
12 V / 9 Ah x 60
Recharge Time
9 hours recover to 90% capacity
Charging Current
1.0 A ± 10% (max.)
2.0 A ± 10% (max.)
2.0 A ± 10% (max.)
4.0 A ± 10% (max.)
Charging Voltage
13.65V ± 1%
Long-run
Model
Type
Depending on applications
Numbers
18 - 20
Charging Current
4.0 A ± 10% (max.)
8.0 A ± 10% (max.)
8.0 A ± 10% (max.)
12.0 A ± 10% (max.)
Charging Voltage
13.65± 1%
PHYSICAL
Model
10K
10KL
15K
15KL
20K
20KL
30K
30 L
Outline
Dimension, D X W X H
592X250X576
815X250X
826
592X250X
576
815X250X
826
592X250X
576
815 X300 X
1000
815X250X
826
Net Weight (kgs)
83
28
164
37
164
37
233.5
64
Packaging
Dimension, D X W X H
700X385X
815
690X370X
670
920X380X
1025
700X385X
815
920X380X
1025
700X385X
815
920 X430 X
1205
920X380X
1025
Net Weight (kgs)
90
31
182
44
182
44
250.5
90
ENVIRONMENT
Operation Temperature
0 ~ 40°C (the battery life will down when > 25°C)
Operation Humidity
<95 % and non-condensing
Operation Altitude**
<1000m
Acoustic Noise Level
Less than 58dB @ 1 Meter
Less than 60dB @ 1
Meter
Less than 65dB @ 1
Meter
MANAGEMENT
Smart RS-232 or USB
Supports Windows® 2000/2003/XP/Vista/2008, Windows® 7, Linux, Unix, and MAC
Optional SNMP
Power management from SNMP manager and web browser
* Derate capacity to to 90% when the output voltage is adjusted to 208VAC.

6
**If the UPS is installed or used in a place where the altitude is above than 1000m, the output power must be derated one percent per 100m.
***Product specifications are subject to change without further notice.

7
3. Functional Block
As a true online UPS, the product applies a double conversion topology, comprising functional blocks as
shown in Figure 3.1
I/P EMI Rectifier PFC Inverter OP EMI
Charger
BPS STS
SPSBattery CNTL
INV STS
Bypass
Maintain Bypass
IP Breaker
Battery SCR and Relay
INV Relay
Maintain Switch
P1 Relay
Output Terminal
P1 Output Terminal
Input
Output Receptacle
COMM
a. Function block Diagram for 10K~20K
I/P EMI Rectifier PFC Inverter OP EMI
Charger
BPS STS
SPSBattery CNTL
INV STS
Bypass
Maintain Bypass
IP Breaker
Battery SCR and Relay
INV Relay
Maintain Switch Output Terminal
Input
COMM
b. Function block Diagram for 30K
Figure 3.1 Function block Diagram
The CNTL block controls the action of the UPS system. It detects the voltage and current to control PFC
and inverter, also it supplies the protection for the UPS, When the UPS becomes abnormal, in most case,
the CNTL can provide basic information indicating the status of the UPS.
The COMM block provides the communication interface for receiving and executing command from users
via the panel or other communication protocol, also provides the LCD display task.
The Rectifier and PFC blocks are the input stage of the UPS. The blocks convert AC input power into
two stable DC power stored in the BUS capacitor. In the meantime, PFC (Power Factor Correction) will
be executed and allows input current tracking the input voltage waveform. Therefore, the input power
factor will be corrected to 1 to achieve maximum efficiency and produce lowest power pollution to the
utility.
The PFC block in battery mode, also called Booster, is used to convert the low voltage DC power to
higher voltage with stable DC power, stored in the BUS capacitor.
The Inverter block is the output stage of the UPS and used to convert DC power from the BUS capacitor
to sine waveform output power.
When the utility is within the acceptable range, the UPS will provide power directly from the utility input
and the Rectifier and PFC will be executed at the same time. When the utility is outside of the acceptable
range, no matter it’s because of input voltage or input frequency, the UPS will shut down the Rectifier
and PFC functions and turn on the Battery Booster. In case of sudden interruption from input utility, the
controller can detect the interruption in very short time. During the short interval of detecting the
interruption, the output power will be provided by the power stored in the BUS capacitor. In this way,
there is no any interruption on output power.
The charger charges the battery when the utility is normal. The charger converts AC input power to DC

8
power for recharging the battery. Two types of chargers will be available, one is for the standard model,
and the other is for long-run model that connects to external batteries.
The Input and Output EMI section provides EMI filter function. The input and output EMI filters can
prevent the UPS from being interference by external electronic/magnetic noise which is generated by
other electronic system and prevent other systems from the noise generated inside the UPS system.
The SPS generates DC power supply needed by operation of the circuit of the UPS itself. The Bypass
provides a path that utility can power the output directly when the Inverter is not executed. The
Maintenance Bypass provides another path that utility can power the output directly when UPS is in
maintenance status. The BYP.STS and ECO.STS blocks are two static transfer switches to make sure the
UPS has less or no transfer time.

9
4. Working Principle of the Major Functional Block
4.1 Switch Power Supply
The Switch Power Supply (SPS) supplies DC power for UPS operation. The input source of the SPS is
the battery, or the output of the charger.
Battery
7812
7815
…………
Cp
C1
C2
C3
RS
D1
D2
D3
Q1
+12V Output
+15V Output
+12V(FAN) Output
TX
Figure 4.1 Basic circuit of power supply
Figure 4.1 is a flyback converter. When Q1 is on, all rectifier diodes (D1/D2/D3) are on open status and
all output capacitors (C1/C2/C3) supply currents to the load. The primary coil of the transformer will
become a pure inductor and the primary current will linearly increase to store energy in the coil. When
Q1 is off, primary current will stop and all rectifier diodes (D1/D2/D3) will turn to “close”status. It will
release the stored energy from the primary coil of the transformer to the secondary coil to supply loads.
At the same time, it will charge output capacitors including 15V, +12V, +5V, +12V(Fan), and HFPW.
The power of 15V, +12V, +5V supplies stable voltage to all kinds of ICs and other devices such as HCT.
The +12V (Fan) is supplied to fans and relays. The HFPWsupplies a high frequency power for the
switch (SCR/IGBT) driver and some other drive boards.
4.2 PFC/Booster
N
Q1
Q2
UBUS+
UBUS-
R/S/T Battery
L1
D2
D1
C1
C2
N
L2
Q3
Q4
Q5
Q6
Figure 4.2 PFC/Booster
As shown in the Figure 4.2, when Q1/Q2 is on and D1/D2 is off, the current will increase to store energy
in choke(L1/L2). When the Q1/Q2 is off and D1/D2 is on, the choke will release energy. Therefore, we
can control the current in chokes (input current) by regulating the time of Q1/Q2 on and off. There are three
independent PFC/Booster for each phase.
4.3 Inverter
The input of the half-bridge inverter topology is two DC voltages, and the output is an AC voltage, as
shown in the Figure 4.3. When Q1 is on and Q2 is off, the voltage of the bridge midpoint is +BUS. When
Q1 is off and Q2 is on, the voltage of the midpoint bridge is –BUS. We can get any voltage waveform
between ±BUS voltage from LC filter output by regulating the duty cycle of Q1/Q2, including sine wave
form.
The half-bridge inverter requires one snubber circuit to absorb the spike for security of the switches.

10
The Bypass output power is supplied by R phase, and there is BYP.STS and INV.STS for the transfer
time requires.
CZ
D2
UI
UO
L
D1
N
C1
C2
Q1
Q2
UBUS+
UBUS-
N
R Phase
BYP.STS
INV.STS
INV.RLY
Figure 4.3 Half-bridge inverter
4.4 Charger
The function of charger is to charge and maintain the batteries at fully charged condition. The charger
charges the batteries with a constant current at initial stage. At the same time, the battery voltage keeps
increasing until reaching the constant charge voltage point. Then, the charge current will decrease
accordingly, now it’s in second stage. After one hour of constant voltage charging, the charge voltage will
change to floating charge voltage, in general, the charger will control the output voltage at a constant
level (13.65V±1% per battery) to optimize battery recharge time and prolong the lifetime of batteries
without overcharging.
As shown in the Figure 4.4, the battery charger applies same flyback topology as the SPS.
…………
Cp
C1
RS
D1
Q1
DC Output
TX
R
Phase
REC
+
-
Figure 4.4 Topology of the charger
Note: There are two kinds of chargers for standard model UPS and long-run model UPS. They both
apply the same principle, but there is one difference in charger output capacity. For standard model UPS,
it’s capable of generating 1A current. For long-run model UPS, it has maximum 4A charge current
capacity.
4.5 EMI Board
Input EMI board is connected between utility and the input of rectifier. Output EMI board is connected
between the output of inverter and output terminal block.
CX
CY
CY
CY
CY
CX
Input Output
Common
Choke
Figure 4.5 Topology of the output EMI

11
Cx
Cx
Cx
Cy Cy
Cy
Cy
Cy
Cy
Cy
Cy
Cy
Cy
Cy
IP/R
IP/S
IP/T
IP/N
OP/R
OP/S
OP/T
OP/N
L1
F1
F2
F3
Figure 4.6 Topology of the input EMI

12
5. Function explanations for each PCB
Table 5.1 PCB information of Galleon 3-1 10~20k
Item
PCB Name
PCB serial number
Quantity
Remark
1
PFC
10k
16-300076-XXG
1
For 10kVA mode, just
S(L2)&T(L3) phase PFC
2
15k/20k
16-300032-XXG
1
For 15K/20KVA model
3
INV
10k
16-300000-XXG
1
For 10kVA model, include
R(L1) phase PFC
4
15k/20k
16-300033-XXG
1
For 15K/20KVA model
5
CNTL
16-300035-XXG
1
6
Charger
1A
16-300040-XXG
1
For standard 10K model
7
16-300233-XXG
1
For standard 15K/20K model
8
4A
16-300233-XXG
1
For long run time 10K model
9
2
For long run time 15K/20K
model
10
O/P Relay
10k
16-300026-XXG
1
Optional, for 10kVA parallel
model
11
15k/20k
16-300046-XXG
1
Optional, for 15k/20KVA
parallel model
12
Power Relay
10k
16-300027-XXG
1
For 10kVA model
13
15k/20k
16-300047-XXG
1
For 15k/20kVA model
14
Communication
16-300245-XXG
1
Only one of them installed on
UPS
15
16-300045-XXG
1
16
Parallel
16-300059-XXG
1
Optional, for parallel model
17
Panel
16-300006-XXG
1
18
EMI
Line I/P
16-300077-XXG
1
For 10KVA model
19
16-300034-XXG
1
For 15k/20KVA model
20
BAT I/P
16-300044-XXG
1
For 15k/20KVA model
21
O/P
16-300009-XXG
1
For 10KVA model
22
16-300036-XXG
1
For 15k/20KVA model
23
MOV
16-300048-XXG
1
Table 5.2 PCBA information of Galleon 3-1 30k
Item
PCBA Name
PCBA serial number
Quantity
Remark
1
PFC
71-301015- XXG
1
Phase R/S of PFC
2
71-301054- XXG
1
Phase T of PFC
3
INV
71-300625- XXG
1
Inverter 1&2
71-300594- XXG
1
Inverter 3
4
CNTL
71-300620- XXG
1
PFC control board
71-300595- XXG
1
INV control board
5
Connector
71-300596- XXG
1
For PFC control board
71-301014- XXG
1
6
Charger
4A
71-300233- XXG
1
For standard 30K model
12A
71-300233- XXG
3
For long run time 30K model

13
7
O/P Relay
71-300043- XXG
3
Optional,for30Kparallel
model
8
Communication
71-300621- XXG
1
9
Parallel
71-300609- XXG
1
Optional, for parallel model
10
Panel
71-300211- XXG
1
11
EMI
Line I/P
71-300034- XXG
1
12
BAT I/P
71-300044- XXG
1
13
O/P
16-300036-XXG
1
14
MOV
71-300048- XXG
1
Note: “XX” in the serial number is the version of the PCB. It may be modified according to releasing
version in the future.
5.1 PFC board (Power Factor Correct Board)
The PFC board consists of Rectifier and PFC/Booster
When UPS works in line mode, the Rectifier and PFC will work, It changes the AC power to DC power
stored in the BUS capacitor. When works in Battery mode, the PFC will only work as boost to get the
higher DC power
5.2 INV board (Inverter Board)
The INV Board includes SPS,STS and Inverter. It supplies the power for the system, and it converts the
DC power to a pure sine waveform, in the purpose of less or no transfer time, there are two STS.
5.3 CNTL board (Control Board)
The CNTL board is the core of the UPS system. It controls the actions of the semiconductors and other
mechanical switches.
5.4 COMM board (Communication Board)
The COMM board is charged of display of the LED/LCD, the control of the buzzer, the communication
with the computer, and other important tasks
5.5 Charger board
There are two kinds of chargers, one is for standard model with 1A charge current and the other is for
long-run model with 4A charge current. But you can set the current to 2A or 1A by changing the jumper
(JP1, short pin1&pin2 is 2A, short pin2&pin3 is 1A). The charge voltage is controlled by CNTL board, but
it can still work without CNTL board. In this case, the output DC voltage is about 246V.
5.6 O/P Relay board
The O/P Relay board should be installed for parallel system. For single system, it must be removed.
The board can disconnect the UPS from the output (parallel system).
5.7 Power Relay board
The Power Relay board can disconnect the P1 from the output.
5.8 Communication board
The Communication board provides RS232/USB interface to the users, and it also provide one EPO port
to cut off the output immediately.
5.9 Parallel board
The Parallel board is used for parallel communication when the UPS system is running in parallel mode.
5.10 Panel board
The Panel board provides LED and LCD display to the users.
5.11 EMI board
The EMI board can prevent the UPS from external electronic/magnetic noise generated by other

14
electronic systems, and also prevent other systems from the noise generated inside of the UPS system.
5.12 MOV board
The MOV board can absorb the surge to protect the UPS system.

15
6. Interface
6.1 LED Display Table 6.1 LED Display
MODE LED
Bypass
Line
Battery
Fault
UPS Startup
●
●
●
●
No output
○
○
○
○
Bypass mode
●
○
○
○
Line mode
○
●
○
○
Battery mode
○
○
●
○
Battery test
●
●
●
○
ECO mode
●
●
○
○
CVCF mode
○
●
○
○
Fault mode
○
○
○
●
●: means LED is lighting.
○: means LED is faded.
6.2 LCD Display
Figure 6.1 LCD Display
6.3 LCD Display Icon
Display
Function
Backup time information
Indicates the backup time in pie chart.
Indicates the backup time in numbers.
H: hours, M: minutes, S: seconds
Fault information

16
Indicates that the warning and fault occurs.
Indicates the fault codes, and the codes are listed in details in section 3-9.
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 output is short.
Programmable output information
Indicates that the programmable outputs are working.
Mode operation information
Indicates the UPS connects to the mains.
Indicates the battery is working.
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 capacity by 0-25%, 26-50%, 51-75%, and
76-100%.
Indicates the battery is unconnected
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

17
7. Trouble Shooting
This section describes how to find the troubles when UPS is abnormal. We suggest you to follow the
service procedure below:
1. Check the UPS status via LED and LCD display, the sound of the buzzer and get the warning
or fault code via the RS232 if possible, otherwise listen to the description of end users.
2. Inspect failure board for static checking.
3. Replace failure components.
4. Static checking.
5. Power-on checking.
6. Test after repair.
Following section will help service person to solve the most problems.
7.1 LCD Panel Display Pattern Definition
7.1.1 Trouble shooting for warning icon in LCD display
Any warning display implies some abnormity happened to the UPS, indicating that some situation that
may endanger the reliability of the UPS has occurred, but these situations don’t immediately lead to
interruption of power supply.
LCD icon (Flashing)
Code
Alarm
Possible cause
Action
01
1 Beeping / second
Battery disconnected
Check the battery wiring
07
1 Beeping / second
Battery/Charger voltage too
high
Check the output voltage of
the battery and the charger
08
1 Beeping / second
Low battery
Check the battery voltage
09
2 Beeping / second
Over load
Check the loads
0B
1 Beeping / second
EPO plug or cable not
connected
Check the EPO plug and
EPO cable
0A
1 Beeping / second
Fan failure
Check the fans
0D
1 Beeping / second
high internal temperature
Check the loads, ventilation,
ambient temperature
0E
1 Beeping / second
Charger broken or low
output voltage
Check the charger
10
1 Beeping / second
I/P fuse broken
Check the I/P fuse

18
02
1 Beeping / second
Input Neutral loss
Check the input wiring
04
1 Beeping / second
Input phase abnormal
Check the input wiring
21
1 Beeping / second
Line input status is
different in parallel
system
Check the R/S/T input
22
1 Beeping / second
Bypass status is different
in parallel system
Check R phase input
33
1 Beeping / second
Overload 3 times in 30min
Check the loads
34
1 Beeping / second
Converter current unbalance
Check the converter
35
1 Beeping / second
Battery fuse broken
Check the Battery fuse
36
1 Beeping / second
Inverter inter-current
unbalance
Check the inverter
3A
1 Beeping / second
Cover of the maintain switch
is open
Check the cover of the
maintain switch or 2-pin
black/black cable to the CN2
in 16-300076-XXG for
10K(CN9 in 16-300033-XXG
for 20K)
3B
1 Beeping / second
Phase auto adapt failure
Please check if phase
sequence between three
phase is correct
3C
1 Beeping / second
Utility extremely unbalanced
There are huge gap between
L1-N and L2-N,or L2-N and
L3-N,or L1-N and L3-N
Please check input voltage.
3D
1 Beeping / second
Bypass unstable
Please check if bypass
voltage is stable.
Note:When the UPS alarms, the UPS is still working on the original mode.

19
7.1.2 Trouble shooting for fault codes in LCD display
When the UPS is fault, it will transfer to Fault mode.
7.1.2.1 Fault code for 10k~20k
Code
LCD
icon
Fault Event
Description
Action
01
None
BUS soft start
failure
When the bus voltage can’t
reach the setting value in
30s, the fault signal will be
displayed.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if the components on
the drive circuit are well.
02
None
BUS voltage high
When one of the following
conditions occurs, the fault
signal will be displayed.
1. +Bus voltage keeps
higher than 450V or
the –BUS voltage keeps
lower than –450V for more
than 200ms.
Maybe the PFC board is damaged;
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
03
None
BUS voltage low
When +Bus voltage keeps
lower than 300V or
the –BUS voltage keeps
higher than -300Vfor more
than 200ms, the fault signal
will be displayed.
Maybe the PFC board is damaged.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
04
None
BUS voltage
unbalance
When the difference
between the ±Bus voltage
absolute value keeps more
than 100 for 200ms, the
fault signal will be sent.
Maybe the PFC board is damaged.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
06
None
Converter over
current
.When the current of
PFC/Boost is over 30
A(20K:60A), the fault signal
will be display
Maybe the PFC board is damaged.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
11
None
INV soft start
failure
Inverter voltage can’t reach
the setting value in 40s.
Check the inverter drive circuit.
12
None
INV voltage high
When INV voltage keeps
higher than 276V for 400
ms, the fault signal will be
displayed.
Check if power components in power INV and
on the drive circuit are normal. Check if IGBT
protective circuit and some PFC components
are normal.
13
None
INV voltage low
When INV voltage keeps
lower than 140V for 400
ms, the fault signal will be
displayed.
Maybe the INV board is damaged;
Check if power components in power INV and
on the drive circuit are normal. Check if IGBT
protective circuit and some PFC components
are normal.
14
Output short
circuited
When INV output voltage
keeps lower than 50V and
output current keeps higher
than 20A for over 4 periods,
the fault signal will be
displayed.
Remove all the loads. Turn off the UPS. Check
whether the output of UPS and loads are short
circuited. Make sure the short circuit is
removed, and the UPS has no internal faults
before turning on again.
1A
None
Negative power
fault
When the output power on
the INV terminal is over
-800W(20K:-1600W) for
60ms or over
-2400W(20K:-4800W) for
20ms, the fault signal will
be displayed.
Check if input and output connections are
correct. And then check, for 10KVA: if INV relay
RY5 or STS(Q13,Q14,Q20,Q31 and their driver
circuits) are OK; for 20KVA: if INV relay RY5
and RY6 or STS(Q13, Q14, Q17,
Q18,Q19,Q20,Q21,Q22 and their driver
circuits) are OK;
21
None
Battery SCR short
circuited
When battery voltage is
more than 310V for 4s, the
fault signal will be
displayed.
It is probably the charger or PFC board
damaged.
Check if the battery SCR(Q21,Q27, Q26, Q49,
Q46,Q58). If PFC board is ensured ok after
checking, it may indicate there is something
wrong with charger output.
Check if components for the battery drive
signals are normal. Check circuit of the utility

20
power SCR part.
24
None
INV relay short
circuited
After Bus soft start
completes and INV PWM is
off, more than 50V INV
voltage is detected, the
fault signal will be
displayed.
Check if INV relay RY5(for 20KVA,check RY5
and RY6) on INV board is OK.
29
None
Battery fuse
broken in Battery
mode
When this battery voltage is
less than 7V, any other
battery voltage is higher
than 9V
The fault signal will be
displayed.
Check the Battery fuse is ok
31
None
Parallel cable
failure
When the parallel
communication between
the UPSs is interrupted, the
fault signal will be
displayed.
Check the parallel cables between the UPSs
are normal, and the cable between the parallel
board and the control board are normal.
36
None
Current un-sharing
When sharing current is
greater than 5Aand sharing
current is greater than
5*ILoad or the share
current less than 5A and
greater than the ILoad+4A
in UPS parallel system, the
fault signal will be
displayed.
Check the share current cable are normal, and
make sure the output be connected together.
41
None
over temperature
The temperature of sink is
over the protection setting.
Check if UPS is overloaded, air vents are
blocked, and ambient temperature is over 40℃.
After overload or block is removed, please keep
UPS cool down for 10 minutes before turning on
again.
It is not recommended to operate the UPS
under over 40°C temperature environment.
43
Overload
The load is over the
settings for certain time.
Check the loads and remove some non-critical
loads.
Check whether some loads are failed.
46
None
Incorrect UPS
setting
The UPS can not identify
the right model.
Check the Model Pin of the Control board is
inserted correctly
7.1.2.2 Fault code for 30k
Code
LCD icon
Fault Event
Description
Action
01
None
BUS soft start
failure
When the bus voltage
can’t reach the setting
value in 30s, the fault
signal will be displayed.
Check if power components such as IGBT
and SCR for the PFC and the utility power
SCR are well. Meanwhile, check if the
components on the drive circuit are well.
02
None
BUS voltage high
When one of the following
conditions occurs, the fault
signal will be displayed.
1. +Bus voltage keeps
higher than 450V or the
–BUS voltage keeps lower
than –450V for more than
200ms.
Maybe the PFC board is damaged;
Check if power components such as IGBT
and SCR for the PFC and the utility power
SCR are well. Meanwhile, check if
components on the drive circuit are well.
03
None
BUS voltage low
When +Bus voltage keeps
lower than 300V or the
Maybe the PFC board is damaged.
Check if power components such as IGBT