Xtreme Power Conversion P91 User manual

P91, TX91, TX91L, TXVR
Service Manual
www.xpcc.com | © 2019 Xtreme Power Conversion Corporaon. All rights reserved. (Rev 4/26/19)

Xtreme Power Conversion Corporaon
P91, TX91, TX91L, TXVR Service Manual
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Uninterrupble Power Supply
Table of Contents
1 General Informaon..................................................................................3
1.1 Geng Started...........................................................................................................................3
1.2 Important Safey Instrucons....................................................................................................3
2 Specicaons............................................................................................4
3 Funconal Block........................................................................................7
4 Working Principle of the Major Funconal Block...........................................8
4.1 Switch Power Supply..................................................................................................................8
4.2 PFC/Booster...............................................................................................................................9
4.3 Inverter.......................................................................................................................................9
4.4 Charger......................................................................................................................................10
4.5 EMI Board.................................................................................................................................10
5 Funcon explanaons for each PCB.........................................................11
5.1 SPS-Charger Board...................................................................................................................11
5.2 Control Board...........................................................................................................................12
5.3 Communicaon Board.............................................................................................................12
5.4 EMI Board................................................................................................................................12
5.5 Main Power Board...................................................................................................................13
5.6 Para Board...............................................................................................................................14
5.7 O/P Relay Board.......................................................................................................................15
6 Interface..................................................................................................15
6.1 LED Display...............................................................................................................................15
6.2 LCD Display...............................................................................................................................16
6.3 LCD Display Icon......................................................................................................................16
7 Troubleshoong......................................................................................18
7.1 LCD Panel Display Paern Denion.......................................................................................18
7.2 Repair.......................................................................................................................................23
7.2 Repair.......................................................................................................................................23
8 Test Step.................................................................................................28
9 Appendix.................................................................................................29

Xtreme Power Conversion Corporaon
P91, TX91, TX91L, TXVR Service Manual
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1 General Informaon
1.1 Geng start
This manual is for P91, TX91, TX91L, TXVR tower and R/T UPS. It can help service person perform the basic main-
tenance and repair service.
This manual only focuses on the service secon, so you should get the basic operaon of the UPS from the user
manual, and make sure you had read and understood the user manual before reading the manual.
The manual include 9 secons:
● General Informaon, this secon shows you the general informaon of the service manual.
● Electric Specicaons, this secon shows you the basic electric specicaon of the UPS.
● Funconal block, this secon shows you the major funconal block of the UPS.
● Working Principle of the Major Funconal Block, this secon shows you the working principle of the
major funconal block.
● Funcon explanaons for each PCB, this secon explains you all the PCBs of the UPS system.
● Interface, this secon shows you the LCD interface, including display and seng.
● Trouble Shoong, this secon gives you the way to nd the problems.
● Test Step, this secon tells you how to test the UPS aer you repair the unit.
● Appendix, this secon shows you the basic waveforms for reference and the basic communicaon
commands.
1.2 Important Safety Instrucons
For qualied 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 ex-
posed connecons or components while UPS is on.
Turn o the UPS and switch o the input breaker before removing protecve case. AC voltage is always
present if the input AC power is sll available.
High voltage may exist at DC capacitors. Before removing the protecve case, wait for at least
ve minutes aer turning o the UPS.
Verify input source (voltage and frequency) is within the maximum range before service.

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2. Specicaons
MODEL NUMBER P91-5K P91-6K P91-10K
CAPACITY Power rang 5kVA (5kW) 6kVA (6kW) 10kVA (10kW)
INPUT Voltage 110–300VAC*
Frequency 50/60Hz
OUTPUT Voltage 200/208/220/230/240VAC (208/120V or 240/120V with oponal transformer)
Frequency 50/60Hz ± 4Hz
THD (full load) < 4%
Overload capacity 110% 10 min; 130% 1 min; > 130% 1 sec
Eciency Up to 95% online mode or 99% ECO mode
BATTERY Charger amps 1–4A
Nominal/oat voltage 240/273VDC
DIMENSIONS & Dimensions (W x D x H) 17.2 x 23.6 x 3.5 in
WEIGHT Weight 33.1 lbs 39.7 lbs
BYPASS Model XBDM-P91A XBDM-P91B
DISTRIBUTION Input connecon L6–30P (5, 6kVA) Terminal Block (5,6,10kVA)
MODULE Output connecon (2) L6-30R+(2) C19 Terminal block + (1) L6-30R+(2) C19
Oponal: L6–30R, L6–20R, 6–20R Oponal: L6–30R, L6–20R, 6–20R
ENVIRONMENT Operang temperature 32–104°F (0–40°C)
Audible noise < 55dBA < 58dBA
Altude 11,500  above sea level
APPROVALS UL, FCC, RoHS (pending)
WARRANTY 3 years electronics, 3 years baery warranty (USA and Canada)
COMMUNICATIONS INTERFACE RS-232, USB, EPO, intelligent slot for oponal cards (Web/SNMP, Relay/dry contact, Modbus)
INCLUDED IN BOX Soware CD, horizontal brackets, tower pedestals, USB cable
AVAILABLE OPTIONS 5 year extended warranty, 4-post rail kit, 2-post shelf kit, transformer
*Depending on load level.
MODEL NUMBER TXVR-3.8K TXVR-5K TXVR-6K TXVR-10K
CAPACITY Power rang 3.8kVA/3.8kW 5kVA/5kW 6kVA/6kW 10kVA/10kW
INPUT Voltage (nominal) 208/220/230/240VAC
Voltage range 110-300VAC
Frequency 46–54Hz or 56–64Hz
OUTPUT Voltage 240/120VAC or 230/115VAC
Voltage Regulaon ± 1%
Frequency 50Hz ± 0.1Hz or 60 Hz ± 0.1Hz
Overload capacity 200% for 1 min 150% for 1 min 130% for 1 min
Eciency up to 97% ECO mode, 91% online mode
Harmonic Distoron <2% @ 100% linear load (regardless of input distoron)
PHYSICAL Input/output Terminal blocks or oponal PDU
Dimensions (W x D x H) 9.8 x 23.2 x 32.4 in
Weight 142 lbs 145 lbs 148 lbs 187 lbs
OPTIONAL PDU Input connecon Terminal Block with 6 L6-30P* Terminal Block
120V receptacle opons 5-15/20R
240V receptacle opons L6-30R, L6-20R, 6-15/20R, C19
ENVIRONMENT Temperature 32–104°F (0–40°C)
Audible noise < 50dBA
Altude 11,500  above sea level
APPROVALS UL, cUL, RoHS
WARRANTY 3 years electronics (USA and Canada)
COMMUNICATIONS INTERFACE RS-232, EPO, intelligent slot for oponal cards (Web/SNMP, Relay/dry contact, Modbus)
INCLUDED IN BOX User manual, RS-232 communicaon cable, ViewPower Soware CD
AVAILABLE OPTIONS 5 year extended warranty, output PDU, input L6-30P cord (for 3.8kVA, 5kVA, 6kVA)

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*Depending on load level.
MODEL NUMBER TX91-3.8K TX91-5K TX91-6K TX91-10K
CAPACITY Power rang 3.8kVA (3.8kW) 5kVA (5kW) 6kVA (6kW) 10kVA (10kW)
INPUT Voltage (nominal) 208VAC (200VAC, 220VAC, 230VAC, 240VAC oponal)
Voltage range 110-300VAC
Frequency 46–64Hz auto-sensing
OUTPUT Voltage 240/120VAC or 230/115VAC
Voltage regulaon ± 1%
Frequency 50/60Hz ± 0.1Hz
Overload capacity 200% for 1 min 150% for 1 min 130% for 1 min
Eciency Up to 97% ECO mode, 91% online mode
BATTERY/CHARGER Baery type Sealed, maintenance-free lead acid
Baery quanty and size
(standard / XR models) (20) 12V 9AH / (20) 12V 580W
Charger voltage/current 273VDC / 1A-4A (selectable)
PHYSICAL Input/output Terminal blocks or oponal PDU
Dimensions (W x D x H) 9.9 x 23.3 x 32.4 in
Weight 272 lbs 275 lbs 278 lbs 307 lbs
OPTIONAL Baery quanty and size BP20-(20) 12V 9AH; BP40-(40) 12V 9AH; BP60-(60) 12V 9AH
BATTERY PACKS Dimensions (W x D x H) 9.9 x 23.3 x 32.4 in
Weight BP20 - 190lbs; BP40 - 320 lbs; BP60 - 450 lbs
OPTIONAL PDU Input connecon Terminal blocks or 6 , L6–30P* Terminal blocks
120V receptacle opons 5–15/20R
240V receptacle opons L6–30R, L6–20R, 6–15/20R, C19
ENVIRONMENT Temperature 32–104°F (0–40°C)
Audible noise < 50dBA
Altude 11,500  above sea level
APPROVALS UL1778, cUL, FCC Class A, RoHS
WARRANTY 3 years electronics, 3 years baery warranty (USA and Canada)
COMMUNICATIONS INTERFACE RS-232, EPO, intelligent slot for oponal cards (Web/SNMP, Relay/dry contact, Modbus)
INCLUDED IN BOX User manual, RS-232 communicaon cable, ViewPower Soware CD
AVAILABLE OPTIONS 5 year extended warranty, output PDU, input L6–30P cord (for 3.8kVA, 5kVA & 6kVA)

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MODEL NUMBER TX91L-3.8K TX91L-5K TX91L-6K TX91L-10K
CAPACITY Power rang 3.8kVA (3.8kW) 5kVA (5kW) 6kVA (6kW) 10kVA (10kW)
INPUT Voltage (nominal) 208VAC (200VAC, 220VAC, 230VAC, 240VAC oponal)
Voltage range 110-300VAC
Frequency 46–64Hz auto-sensing
OUTPUT Voltage 240/120VAC or 230/115VAC
Voltage regulaon ± 1%
Frequency 50/60Hz ± 0.1Hz
Overload capacity 200% for 1 min 150% for 1 min 130% for 1 min
Eciency Up to 97% ECO mode, 91% online mode
BATTERY/CHARGER Charger amps 1A-4A (max) programmable from LCD
Charger voltage 273VDC
PHYSICAL Input/output Terminal blocks or oponal PDU
Dimensions (W x D x H) 9.9 x 23.3 x 32.4 in
Weight 152 lbs 155 lbs 158 lbs 187 lbs
OPTIONAL PDU Input connecon Terminal blocks or 6 , L6–30P* Terminal blocks
120V receptacle opons 5–15/20R
240V receptacle opons L6–30R, L6–20R, 6–15/20R, C19
ENVIRONMENT Temperature 32–104°F (0–40°C)
Audible noise < 50dBA
Altude 11,500  above sea level
APPROVALS UL1778, cUL, FCC Class A, RoHS
WARRANTY 3 year electronics (USA and Canada)
COMMUNICATIONS INTERFACE RS-232, EPO, intelligent slot for oponal cards (Web/SNMP, Relay/dry contact, Modbus)
INCLUDED IN BOX User manual, RS-232 communicaon cable, ViewPower Soware CD
AVAILABLE OPTIONS 5 year extended warranty, output PDU, input L6–30P cord (for 3.8kVA, 5kVA & 6kVA)
*6kVA system capacity will be reduced by 30A input circut

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3. Funconal Block
As a true online UPS, the product applies a double conversion topology, comprising funconal blocks as shown in
Figure 3.1
Figure 3.1 Funcon block Diagram
The CNTL block controls the acon of the UPS system. It also provides the communicaon interface for receiving
and execung command from users via the panel or other communicaon protocol. When the UPS becomes
abnormal, in most case, the CNTL can provide basic informaon indicang the status of the UPS.

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The Recer 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 meanme, PFC (Power Factor Correcon) 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 eciency and produce lowest power polluon to the ulity.
The PFC block in baery 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 ulity is within the acceptable range, the UPS will provide power directly from the ulity input and
the Recer and PFC will be executed at the same me. When the ulity is outside of the acceptable range, no
maer it’s because of input voltage or input frequency, the UPS will shut down the Recer and PFC funcons
and turn on the Baery Booster. In case of sudden interrupon from input ulity, the controller can detect the
interrupon in very short me. During the short interval of detecng the interrupon, the output power will be
provided by the power stored in the BUS capacitor. In this way,
there is no any interrupon on output power.
The charger charges the baery when the UPS system is working. Yo u can set the current to be
1A/2A/3A/4A by LCD or command. And you can choose a dierent voltage corresponding to dierent baery
pieces by changing the jumper on the CNTL board, either LCD or command.
The Input EMI secon provides EMI lter funcon. The input EMI lters can prevent the UPS from being
interference by external electronic/magnec 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 operaon of the circuit of the UPS itself. The Bypass provides
a path that ulity can power the output directly when the Inverter is not executed. The Maintenance Bypass
provides another path that ulity can power the output directly when UPS is in maintenance status.
4. Working Principle of the Major Funconal Block
4.1 Switch Power Supply
The Switch Power Supply (SPS) supplies DC power for UPS operaon. The input source of the SPS is the
grid when the grid voltage is higher than 110V . Or the input source of the SPS is the baery.
Figure 4.1 Basic circuit of power supply

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Figure 4.1 is a yback converter. When Q1 is on, all recer diodes (D1/D2/D3) are on open status and all out-
put 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 o, primary cur-
rent will stop and all recer 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 me, it will charge output
capacitors including 15V, +12V, +5V, +12V(Fan), and HFPW.
The power of 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-
Utility
Battery
L1
D2
D1
C1
C2
N
L2
Q3
Q4
Q5
Figure 4.2 PFC/Booster
As shown in the Figure 4.2, when Q1/Q2 is on and D1/D2 is o, the current will increase to store energy in
choke(L1/L2). When the Q1/Q2 is o and D1/D2 is on, the choke will release energy. Therefore, we can control
the current in chokes (input current) by regulang the me of Q1/Q2 on and o.
4.3 Inverter
The input of the three level inverter topology is two DC voltages, and the output is an AC voltage, as shown in
the Figure 4.3. When Q1/Q2 is on and Q/Q3 is o, the voltage of the bridge midpoint is +BUS. When Q1/Q2 is o
and Q3/Q4 is on, the voltage of the midpoint bridge is –BUS. We can get any voltage waveform between ±BUS
voltage from LC lter output by regulang the duty cycle of Q1/Q2/Q3/Q4, including sine wave form.
Figure 4.3 Three level inverter bridge

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4.4 Charger
The funcon of charger is to charge and maintain the baeries at fully charged condion. The charger charges
the baeries with a constant current at inial stage. At the same me, the baery voltage keeps increasing unl
reaching the constant charge voltage point. Then, the charge current will decrease accordingly, now it’s in second
stage. Aer one hour of constant voltage charging, the charge voltage will change to oang charge voltage, in
general, the charger will control the output voltage at a constant level (13.65V±1% per baery) to opmize bat-
tery recharge me and prolong the lifeme of baeries
without overcharging.
Figure 4.4 Topology of the charger
4.5 EMI Board
Input EMI board is connected between ulity and the input of recer.
CX
CY
CY
CY
CY
CX
Input Output
Common
Choke
Figure 4.5 Topology of the EMI

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5 Funcon explanaons for each PCB
Table 5.1 PCB informaon
Item PCB Name PCB serial number Quan-
ty
Remark
1SPS-Charger 6k 71-302390-XXG 1
10k 1
2CNTL 72-300211-XXG /
71-301569-XXG
1
3 Communicaon 72-300294-XXG/71-302389-XXG
72-300571-XXG/71-303176-XXG
1
4 EMI 6k 71-302448-XXG 1For 6kVA model
10k 71-302408-XXG 1For 10kVA model
5Main Power 6k 71-302114-XXG 1For 6kVA model
10k 71-301756-XXG 1For 10kVA model
6 Para(A) 71-302096-XXG 1They are oponal for
parallel funcon.
Para(B) 71-302097-XXG 1
Para 71-303273-XXG
Just for tower
7 O/P Relay 71-300026-XXG 1
Note: “XX” in the serial number is the version of the PCB. It may be modied according to releasing
version in the future.
5.1 SPS-Charger board
The SPS-Charger board consists of switch power supply (SPS) and charger. The SPS generates all the
powers needed by dierent circuits.
You can set the charge current to be 1A/2A/3A/4A on LCD by conguring jumpers JP01, JP02, JP03, JP04
and JP05 you can also set charge voltage based on the number of baeries per string

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5.2 CNTL board (Control Board)
The CNTL board is the core of the UPS system. It controls the acons of the semiconductors and other mechani-
cal switches, the display of the LED/LCD, the sound of the buzzer, the communicaon with the computer, and
other important tasks.
5.3 Communicaon board
The Communicaon board provides RS232/USB interface to the users, and it also provide one EPO port
to cut o the output immediately.
5.4 EMI board
The EMI board can prevent the UPS from external electronic/magnec noise generated by other electronic
systems, and also prevent other systems from the noise generated inside of the UPS system. And the MOV is also
on the EMI board which can absorb the surge to protect the UPS system.

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6k
10k
5.5 Main Power board
The Main converts the AC/DC power to a pure sine waveform. And then it converts the DC/AC power. There are
many semiconductors and easy-failure components on the board, so it’s required to pay more aenon when
UPS is abnormal.
component side 10k
6k

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10k
5.6 Para board
The Para(A) board and Para(B) board is used for parallel communicaon when the UPS system is running in paral-
lel mode.
Board 1
Board 2
Board 3

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5.7 O/P Relay board
The O/P Relay board should be installed for parallel system. For single system, it can be removed. The board can
disconnect the UPS from the output (parallel system).
6. Interface
6.1 LED Display
Table 6.1 LED Display
Mode LED Bypass Line Baery Fault
UPS Startup ● ● ● ●
No Output mode ○ ○ ○ ○
Bypass mode ● ○ ○ ○
AC mode ○ ● ○ ○
Baery mode ○ ○ ● ○
CVCF mode ○ ● ○ ○
Baery Test ● ● ● ○
ECO mode ● ● ○ ○
Fault ○ ○ ○ ●
Note: ● means LED is lighng, and ○ means LED is faded.

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6.2 LCD Display
Figure 6.1 LCD Display
6.3 LCD Display Icon
Display Funcon
Backup me informaon
Indicates the backup me in pie chart.
● Indicates the backup me in numbers.
H: hours, M: minutes, S: seconds
● When UPS is in Bypass mode, these two numbers indicang the power capacity; 06 for 6K
model and 10 for 10K model.
Fault informaon
Indicates that the warning and fault occurs.
Indicates the fault codes, and the codes are listed in details in secon 7-1.
Mute operaon
Indicates that the UPS alarm is disabled.
Output & Baery voltage informaon
Indicates the output voltage, frequency or baery voltage. Vac: output voltage, Vdc: baery
voltage, Hz: frequency
Load informaon
Indicates the load level by 0-25%, 26-50%, 51-75%, and 76-100%

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Indicates overload.
Indicates the load or the output is short.
Mode operaon informaon
Indicates the UPS connects to the ulity.
Indicates the baery 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.
Baery informaon
Indicates the Baery capacity by 0-25%, 26-50%, 51-75%, and 76-100%.
Indicates the baery is fault.
Indicates low baery level and low baery voltage.
Input & Baery voltage informaon
Indicates the input voltage or frequency or baery voltage. Vac: Input voltage, Vdc: baery
voltage, Hz: input frequency

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7. Troubleshoong
This secon describes how to nd 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, or listen to the descripon of end
users.
2. Inspect failure board for stac checking.
3. Replace failure components.
4. Stac checking.
5. Power-on checking.
6. Test aer repair.
Following secon will help service person to solve most problems.
7.1 LCD Panel Display Paern Denion
7.1.1 Trouble shoong for warning icon in LCD display
Any warning display implies some abnormity happened to the UPS, indicang that some situaon that may
endanger the reliability of the UPS has occurred, but these situaons don’t immediately lead to interrupon of
power supply.
LCD icon (Flashing) Alarm Possible cause Acon
1 Beeping / second Low baery Check the baery voltage
2 Beeping / second Over load Check the loads
1 Beeping / second Baery disconnected Check the baery wiring
1 Beeping / second Baery/Charger voltage
too high
Check the output voltage of the bat-
tery and the charger
1 Beeping / second EPO plug or cable not
connected
Check the EPO plug and EPO cable
1 Beeping / second Fan failure, or high
internal temperature
Check the fans, loads, venlaon,
ambient temperature
1 Beeping / second Charger broken or
low output voltage
Check the charger
1 Beeping / second I/P fuse broken Check the I/P fuse
1 Beeping / second Overload 3 mes in
30min
Check the loads
Note: When the UPS alarms, the UPS is sll working on the original mode.

Xtreme Power Conversion Corporaon
P91, TX91, TX91L, TXVR Service Manual
Page 19
Uninterrupble Power Supply
7.1.2 Trouble shoong for fault codes in LCD display
When the UPS is fault, it will transfer to Fault mode.
Code LCD icon Fault Event Descripon Acon
01 None BUS so start failure When the bus voltage can’t reach the
seng value in 30s, the fault signal
will be displayed.
Check if power components such
as PFC/ INV IGBT and PFC SCR
are well. Meanwhile, check if the
components on the drive circuit
are well.
02 None BUS voltage high When one of the following condi-
ons occurs, the fault signal will be
displayed.
1. +Bus voltage remains
higher than 450V or the –BUS volt-
age remains lower than –450V for
more than 50 ms.
2. +Bus voltage remains higher than
400V or the –BUS voltage remains
lower than –400V for more than 1.5s.
Maybe the main board is dam-
aged;
Check if power components such
as IGBT and SCR for the PFC and
the ulity power SCR are well.
Meanwhile, check if components
on the drive circuit are well.
03 None BUS voltage low When +Bus voltage remains lower
than 230V or the –BUS voltage re-
mains higher than –230V for more
than 200ms, the fault signal will be
displayed.
Maybe the main board is dam-
aged. Check if power components
such as IGBT and SCR for the PFC
and the ulity power
SCR are well. Meanwhile, check if
components on the drive circuit
are well.
04 None BUS voltage unbal-
ance
When the dierence between the
±Bus voltage absolute value remains
more than 40V for 2 minutes, the
fault signal will be sent.
Maybe the main board is dam-
aged.
Check if power components such
as IGBT and SCR for the PFC and
the ulity power SCR are well.
Meanwhile, check if components
on the drive circuit are well.
11 None INV so start failure Inverter voltage can’t reach the set-
ng value in 30s.
Check the inverter drive circuit.
12 None INV voltage high When INV voltage remains higher
than 276V for 128 ms, the fault signal
will be displayed.
Check if power components in
power INV and on the drive circuit
are normal. Check if IGBT protec-
ve circuit and some PFC compo-
nents are normal.
13 None INV voltage low When INV voltage remains lower than
140V for 128 ms, the fault signal will
be displayed.
Maybe the main board is dam-
aged;
Check if power components in
power INV
and on the drive circuit are
normal. Check if IGBT protecve
circuit and some PFC components
are normal.

Xtreme Power Conversion Corporaon
P91, TX91, TX91L, TXVR Service Manual
Page 20
Uninterrupble Power Supply
Code LCD icon Fault Event Descripon Acon
14 Output short
circuited
When INV output voltage remains
lower than 50V and output current
keeps lower than 20A for over 3 peri-
ods, the fault signal will be displayed.
Remove all the loads. Turn o 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 Negave power fault When the output power on the INV
terminal is over -800W, the fault
signal will be displayed.
Check if input and output con-
necons are correct. And then
check if INV relay RY5 or STS(Q13,
Q14, Q20,Q25 and their driver
circuits) are OK.
60 None Inverter over current Inverter voltage > 100V, and (Inverter
voltage - bypass or line voltage) < 20V,
and detected inverter current > 75A
(10K) or 45A (6K)
Check if the heavy load or unique
load is connected to the UPS.
6D None Inverter current
detecon error
The sample average value of Inverter
current/ output current/share current
is too high.
Check if the INV and output cur-
rent detecng circuit is OK.
77 None Transformer over
temperature
Transformer is over temperature limit
for 1 minute
Just for cTUVus model
Check if the Transformer Fan is
damaged or the transformer NTC
wire is shorted. If not,
connuous 1minute. Maybe you
need to replace the dry board and
the communicaon board. AT
worst, the transformer is dam-
aged.
21 None Baery SCR short
circuited
When baery voltage is more than
310V, the fault signal will be dis-
played.
main board is probably damaged.
Replace the board.
24 None INV relay short cir-
cuited
Aer Bus so start completes and INV
PWM is o, more than 50V INV volt-
age is detected, the fault signal will be
displayed.
INV relay on the main board is
shorted. Replace the main board
2A None Charger short cir-
cuited
Detecng baery voltage less than
100V
If the charge 2P wire and ba ery
voltage are ok, charger circuit may
be faulty. Replace the PSDR board