Must PV1100 PLUS Series User manual

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
Solar Inverter/Charger
PV1100 PLUS
(1200VA/1800VA/2400VA)

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
Table of Contents
1. General Information…………………………………………………...............................1
1.1 Brief Introduction………………………………………………………………….……1
1.2 Inverter Schematic Diagram………………………………………………………….1
1.3 Inverter Components Instructions....................................................................... 2
2. Fault Code................................................................................................................3
3. Maintenance.............................................................................................................4
4. Fault Symptom ........................................................................................................4
4.1 Inverter Failure in Starting..................................................................................4
4.2 PV Failure in Charging.......................................................................................5
4.3 Fault Code 00/01 When Starting Inverter...........................................................6
4.4 Fault Code 02.....................................................................................................6
4.5 Fault Code 03 ....................................................................................................7
4.6 Fault Code 04.....................................................................................................7
4.7 Fault Code 05.....................................................................................................7
4.8 Fault Code 06.....................................................................................................7
4.9 Fault Code 07.....................................................................................................8
4.10 Fault Code 10 ..................................................................................................8
4.11 Fault Code 12...................................................................................................8
4.12 Fault Code 14 ..................................................................................................9
4.13 Fault Code 15 ..................................................................................................9
5. Inverter Disassemble & Assemble...........................................................................10
6. Inverter Testing after Repairing...............................................................................10

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 1 -
1. General Information
1.1Brief introduction
This manual mainly introduces the maintenance methods of PV11-1200
model, disassembly and some attention; please refer to PV11-1200
maintenance manual when repairing PV11-1800/PV11-2400.
1.2 Inverter Schematic Diagram
PV Priority: Black Arrow
AC Priority: Red Arrow
Batter
Load
PV Board
DC/DC
INVERTER
Line
Charger
DC/DC

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 2 -
1.3 Inverter Components Instructions
Figure 1.1
Main
Board
Button
Board
Control
Board
PV Charger
Board
LCD Screen
Battery Reverse
Protection Part
Figure 1.2
Figure 1.2
Figure 1.4
Figure 1.5
Figure 1.6
Figure 1.7
Figure 1.8

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 3 -
2. Fault Code
Note: No.00-No.07 is fault code; No.10-No.16 is warning code
Fault Code
Description
00
Output short circuit
01
Output overload
02
Battery damaged
03
Inverter output volt is over 280VAC
04
Inverter output volt is below 170VAC
05
PV charger MOS temperature is too high
06
Battery volt is too high
07
Fan fault
Warning Code
Description
10
PV charge current is too large
11
PV input volt is too low
12
PV input volt is too high
14
Frequency abnormal
15
Battery volt is too low
16
Overload warning

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 4 -
3. Maintenance
Note: When repairing, in order to avoid second damage caused by large current, you must
use DC power supply analog battery to connect to open the inverter, and make sure the
current is below 3A.
4. Fault Symptom
4.1 Inverter Failure in Starting
Possible Reasons as follows
A. Battery Reversely Connected or Battery Volt Abnormal
Check if battery input volt is normal:
B. Battery Reverse Protection Board Fuse Broken
Check if fuse is disconnected (Figure 1.1)
C. Control Board Auxiliary Power Abnormal
Check if auxiliary power MOS and IC are broken.( Figure 1.7, less possibility, normally
occurs when inverter blast)
Position
Type
Normal Value
Failure Status
Battery input
terminal
Cable connection
terminal
10-14VDC
Beyond normal value
Position
Type
Normal Value
Failure Status
Battery reverse
protection board F1
Fuse
Direct connected, 0
ohm
Disconnected
Position
Type
Normal Value
Failure Status
Control board Q7
MOS
Boost reversely
between D-S 0.551
Short circuit or other
value

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 5 -
D. Main Board MOS Broken when Boosting (Figure 1.2)
Position
Type
Normal Value
Failure Status
Main board Q1-Q7
MOS
Boost reversely
between D-S 0.248
Short circuit or other
value
Note: If confirmed MOS broken, need to check if relative drive resistor is burned, broken
resistor value is larger than normal one.
E. Main Board Invert MOS Broken (Figure 1.3)
Position
Type
Normal Value
Failure Status
Main board Q8-Q16
MOS
Boost reversely
between D-S 0.515
Short circuit or other
value
Note: If confirmed MOS broken, need to check if relative drive resistor is burned, broken
resistor value is larger than normal one.
F. Cables Not to Connect Well
Position
Type
Normal Value
Failure Status
Connection cable
between control board
and button board
Connection
cable
Connected well
Disconnected
4.2 PV Failure in Charging
Possible Reasons as follows
A. PV Cables Connected Reversely or PV Volt Abnormal
Position
Type
Normal Value
Failure Status
PV cable connection
terminal
Cable connection
terminal
Connected well &
PV volt between
15-30VDC
Poor connect, PV volt
is beyond normal
value
B. In AC Priority Mode
Position
Type
Normal Value
Failure Status
Setting option No.6
Charger priority
setting
CSO/OSO
Others

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 6 -
C. PV Charger Board (Figure 1.8)
Position
Type
Normal Value
Failure Status
PV charger board
Q7\Q8\Q9
Triode
Boost 0.660
Short circuit or big gap
compared with normal
value
4.3 Fault Code 00/01 When Starting Inverter
Possible Reasons as follows
A. Output Load Short Circuit or Overload
Disconnect load and restart to check if it is the load problem.
B. Main Board Output Invert MOS Broken (Figure 1.3)
Position
Type
Normal Value
Failure Status
Main board Q8-Q16
MOS
Boost reversely
between D-S 0.515
Short circuit or other
value
Note: If confirmed MOS broken, need to check if relative drive resistor is burned, broken
resistor value is larger than normal one.
4.4 Fault Code 02
Possible Reasons as Follows
A. Battery Damaged, battery volt is too low.
B. Battery is Connecting other load result in battery volt can’t be boosted.

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 7 -
4.5 Fault Code 03
Possible Reasons as Follows
A. One group of output invert MOS on main board doesn’t work (Figure 1.3)
Position
Type
Normal Value
Failure Status
Main board Q8-Q16
MOS
Boost reversely
between D-S 0.515
Short circuit or other
value
Note: If confirmed MOS broken, need to check if relative drive resistor is burned, broken
resistor value is larger than normal one.
B. Voltage detected abnormal, circuit burned (less possibility, normally occurs when
inverter blast)
4.6 Fault Code 04
Possible Reasons as Follows
A. Battery volt is too low and load is too large
Disconnect load and restart
4.7 Fault Code 05
Possible Reasons as Follows
A. PV charger board temperature too high, circuit abnormal (Figure 1.4)
Position
Type
Normal Value
Failure Status
PV charger board
C14
Chip capacitor
Resistance valus is
around 8.5K
Big gap compared
with normal value
4.8 Fault Code 06
Possible Reasons as Follows
A. PV charger voltage can’t be controlled, check charger MOS (Figure 1.5)
Position
Type
Normal Value
Failure Status
PV charger board
Q1-Q7
MOS
Boost reversely
between D-S 0.455
Short circuit or other
value

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 8 -
4.9 Fault Code 07
Possible Reasons as Follows
A. Fan is broken.
B. Fan is blocked.
4.10 Fault Code 10
Possible Reasons as Follows
A. PV charger board charge MOS is broken, current is not limited (Figure 1.5)
Position
Type
Normal Value
Failure Status
PV charger board
Q1-Q7
MOS
Boost reversely
between D-S
0.455
Short circuit or other
value
B. PV current detected abnormal, circuit damaged (Figure 1.6)
Position
Type
Normal Value
Failure Status
PV charger board
U1-U2
IC
Normal
Pin-out to earth (4 pins)
short circuit
4.11 Fault Code 12
Possible Reasons as Follows
A. PV input volt is over rated max open circuit volt
Position
Type
Normal Value
Failure Status
PV cable connection
terminal
Cable connection
terminal
Connected well，
the volt between
15-30VDC
Poor connect, PV inout
volt is over 50VDC

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 9 -
4.12 Fault Code 14
Possible Reasons as Follows
A. Utility frequency is below 40Hz or over 70Hz
Position
Type
Normal Value
Failure Status
Utility input socket
Socket
40-70 Hz
Beyond normal value
4.13 Fault Code 15
Possible Reasons as Follows
A. Battery low volt warning.
B. Low DC cut-off voltage is set too high
Position
Type
Normal Value
Failure Status
Setting option 07
Low DC cut-off
voltage
10.5-11.5VDC
Others
4.14 Fault Code 16
Possible Reasons as Follows
A. Overload warning
Deduct some loads

Service Manual
PV1100 PLUS Series
(1200VA/1800VA/2400VA)
- 10 -
5. Inverter Disassemble & Assemble
5.1 Take out the 5 screws in the inverter bottom side, then you can open the
unit;
5.2 Take off the connection cable of LCD and button board;
5.3 Dis-assembly battery reverse protection board, take off all cables on main
board;
5.4 Dis-assembly the screws on main board, then you can take out the main
board (please note there’s snap joint when taking it out)
6. Inverter Testing after Repairing
6.1 Connect DC and test OK
6.2 Connect AC and test OK
6.3 Connect PV and test OK