Inovance MD380 Series User manual

MD380 Solar Pump AC Drive User Guide
User Guide
A01
Data code 19010510
Copyright Shenzhen Inovance Technology Co., Ltd.
Shenzhen Inovance Technology Co., Ltd.
Add.: Building E, Hongwei Industry Park, Liuxian Road, Baocheng No. 70 Zone, Bao’an District, Shenzhen
Tel: [phone]
Fax: [phone]
Service Hotline: [phone]
http: //www.inovance.com
Suzhou Inovance Technology Co., Ltd.
Add.: No. 16 Youxiang Road, Yuexi Town, Wuzhong District, Suzhou 215104, P.R. China
Tel: [phone]
Fax: [phone]
Service Hotline: [phone]
http: //www.inovance.com
User Guide
MD380 Solar Pump AC Drive

Contents
1Product Information.............................................................................................................................................1
1.1 Nameplate and Designation Rule...........................................................................................................1
1.2 General Specifications................................................................................................................................1
2Wiring.........................................................................................................................................................................4
2.1 Typical Wiring................................................................................................................................................4
2.2Extension I/O Card MD38IO1...................................................................................................................7
3Operation Panel...................................................................................................................................................11
3.1 Get Familiar With Operation Panel.......................................................................................................11
4Quick Setup...........................................................................................................................................................14
4.1 Setup Flowchart..........................................................................................................................................14
4.2 MPPT Fine-Tuning.....................................................................................................................................16
4.3 Hibernating and Wake-up........................................................................................................................19
4.4 Dry Run Protection.....................................................................................................................................20
4.5 Output Power and Accumulative Electricity Consumption Display.............................................20
4.6 Flow Calculation and Display .................................................................................................................20
4.7 Pump Automatic Cleaning.......................................................................................................................21
5Parameter Table..................................................................................................................................................23
5.1 Group F0: Fundamental...........................................................................................................................23
5.2 Group F1: Motor 1 Parameters..............................................................................................................24
5.3 Group F2: Vector Control.........................................................................................................................25
5.4 Group F3: VF Control................................................................................................................................25
5.5 Group F4: Input Terminals.......................................................................................................................27
5.6 Group F5: Output Terminals...................................................................................................................29
5.7 Group F6: Start and Stop Control.........................................................................................................30
5.8 Group F7: Product and Software Version Checking.......................................................................31
5.9 Group F8: Auxiliary Functions................................................................................................................31
5.10 Group F9: Fault and Protection..............................................................................................................32
5.11 Group FC: Simple PLC Multi-Reference.............................................................................................33
5.12 Group FD: Communication Parameters..............................................................................................34
5.13 Group FF: AC Drive Parameters...........................................................................................................34
5.14 Group FP: Function Code Management.............................................................................................35
5.15 Group A9: Special Parameters for Solar Pump Application..........................................................36
5.16 Group U0: Monitoring................................................................................................................................37
6Troubleshooting..................................................................................................................................................38
6.1 AC Drive Fault Codes...............................................................................................................................38
6.2 AC Drive Common Symptoms and Diagnostics...............................................................................41
Revision History......................................................................................................................................................42

1
1 Product Information
1.1 Nameplate and Designation Rule
Nameplate
Model
Rated input
Rated output
Manufacturer
Serial No.
MODEL: MD380T3.7G-SP-INT
INPUT: 3PH AC380-480V 10.5A 50/60Hz
OUTPUT: 3PH AC0-480V 9A 0-500Hz 3.7kW
Suzhou Inovance Technology Co.,Ltd.
Serial No.: 010140374FB00005
Product name PRODUCT: AC Drive
Made in China
MD380 series AC
drive
MD380 T
Voltage Class
3.7 -SP
Mark
-SP
G
General type
Mark
G
Mark
Type of Applicable Motor
Solar pump
Single-phase 220 V
Customized
0.4
Mark Applicable Motor (kW)
1.5
0.4
...
3.7
-INT
Note (a): The model number may
include a suffix "XXXXXXXXXX",
Where "XXXXXXXXXX" can be
blank or combination of any
alphanumeric and/or symbols that
represents customer identity.
Version
Mark
-(a) Other variants
Three-phase 380 V
T
S
1.5
...
3.7 ...
... 18.5
18.5
-INT International
1.2 General Specifications
☆: At 4 kHz carrier frequency without derating.
Voltage class
Single Phase, 220 VAC
Three Phase, 380 VAC
Drive model:
MD380xxxxG-SP-INT
S0.4 S0.75 S1.5 S2.2 S3.7 T0.7 T1.5 T2.2 T3.7 T5.5 T7.5 T11 T15 T18.5
Dimension ★
Height * Width* Depth (mm)
H: 186
W: 125
D: 164
H: 322
W: 208
D: 192
H: 186
W: 125
D: 164
H: 248
W: 160
D: 183
H: 322
W: 208
D: 192
H: 432
W: 285
D: 228
Mounting Hole (mm)
5
6
5
5
6
6.5
Drive Input
(AC)
Rated input voltage
Single Phase 200~240 VAC, -15%~
+10% (170~264VAC)
Three Phase 380~480 VAC, -15%~ +10%
( 323~528 VAC )
Rated input current, [A]
5.4
8.2
14
23
32
3.4
5
5.8
10.5
14.6
20.5
26
35
38.5
Power capacity, [kVA]
1
1.5
3
4
7
1.5
3
4
5.9
8.9
11
17
21
24
Rated input frequency
50/60 Hz, ±5%
Drive Input
(DC)
DC input voltage range
180~400 VDC
350~800 VDC
DC input operating
voltage
220~350 VDC 350~750 VDC
Recommended DC input
power [KW]
0.5 0.9 1.8 2.6 4.5 0.9 1.8 2.6 4.5 6.5 9 13 18 22
Drive Output
Applicable motor
[kW]
0.4
0.75
1.5
2.2
3.7
0.75
1.5
2.2
3.7
5.5
7.5
11
15
18.5
[HP]
0.5
1
2
3
5
1
2
3
5
7.5
10
15
20
25
Output current [A]
☆2.3 4 7 9.6 13 2.1 3.8 5.1 9 13 17 25 32 37
Max. output voltage
Three Phase 200~240 VAC
(Proportional to input voltage)
Three Phase 380~480 VAC
(Proportional to input voltage)
Max. output frequency
500 Hz
Enclosure
IP 20

2
★: The mounting dimensions are shown below.
W
A
B H1
D
H
Fig1-1. Physical appearance and overall dimensions of the MD380 (0.4kW~15kW plastic housing)
W
A
HB H1
D
Fig1-2. Physical appearance and overall dimensions of the MD380 (18.5kW sheet metal housing)

3
Table 1-1 Overall dimensions and mounting hole dimensions
Model
Mounting Hole
(mm)
Overall Dimensions
(mm)
Mounting Hole Diameter
(mm)
Weight
(kg)
A
B
H
H1
W
D
Single-phase 220 V
MD380S0.4G-SP-INT
113 172 186 / 125 164 ø5.0 1.1
MD380S0.7G-SP-INT
MD380S1.5G-SP-INT
MD380S2.2G-SP-INT
MD380S3.7G-SP-INT 190 305 322 / 208 192 ø6 6.5
Three-phase 380 V
MD380T0.7G-SP-INT
113 172 186 / 125 164 ø5.0 1.1MD380T1.5G-SP-INT
MD380T2.2G-SP-INT
MD380T3.7G-SP-INT 148 236 248 / 160 183 ø5.0 2.5
MD380T5.5G-SP-INT
MD380T7.5G-SP-INT
190 305 322 / 208 192 ø6 6.5
MD380T11G-SP-INT
MD380T15G-SP-INT
MD380T18.5G-SP-INT
235 447 432 463 285 228 ø6.5 20MD380T22G-SP-INT
MD380T30G-SP-INT

4
2 Wiring
2.1 Typical Wiring
W
V
U
T
R
Mains
Supply
MD380-SP
Supply Ground
L3
L1
COM
IM
Forward jog
Multi-reference
1
Forward run
Fault reset
[ F4-01 = 4 ]
[ F4-03 = 12 ]
[ F4-00 =1 ]
[ F4-02 = 9 ]
[0–10 VDC] or [0–20 mA]
GND
10 VDC
AI1
GND
485+
485-
RS485+
RS485-
Analog output
0–10 VDC / 0–
Remote/ external
operating panel
(keypad & display)
DI4
DI3
DI2
DI1
+24 VDC
Relay output:
250 VAC, between 10 mA to 3 A
30 VDC, between10 mA to 1 A
T/A
T/B
GND
AO1
0
100%
RJ45
MD38TX1
(optional)
J13
extension
port
0–10 VDC
AI2
S
L2
Multi-reference 2
[ F4-04 = 13 ]
DI5
T/C
COM
FM
CME
DO1
Pulse output: 0–100 kHz
Open-collector output:
10–24VDC / 0–50mA
Open-collector output:
10–24VDC / 0–50mA
Current mode
Jumper J8 for AI2
Current mode
Voltage mode
Jumper J5 for AO1
+
_
Water Tank Level
Detection
Power Grid
Motor and Pump
KM1
+
KM2
Interlock
Voltage mode

5
Terminal Description
Terminals of main circuit
Single phase 220 V
L1 L2 PB UVW
POWER MOTOR
Terminal
Terminal Name
Description
L1, L2 Single-phase power supply input terminals Connect to the single-phase 220 VAC power supply.
(+), (-)
Positive and negative terminals of DC
bus Connect to solar PV panel.
PB, (+)
Connecting terminals of braking
resistor
Connect to a braking resistor.
U, V, W
Output terminals
Connect to a three-phase motor.
Grounding terminal
Must be grounded.
Three phase 380V
Terminal
Terminal Name
Description
R, S, T
Three-phase power supply input
terminals
Connect to the three-phase AC power supply.
(-), (+)
Positive and negative terminals of
DC bus Connect to solar PV panel.
PB, (+)
Connecting terminals of braking
resistor Connect to a braking resistor.
U, V, W Output terminals Connect to a three-phase motor.
Grounding terminal
Must be grounded.
Warning: Do not use terminal (--) for braking resistor, otherwise AC drive would be damaged.

6
Terminals of main control board
+24V
+10V AI1 AI2 DI1 DI2 DI3 DI4 DI5 COM
GND GND AO1 CME COM DO1 FM OP T/A T/B T/C
Terminal
Terminal Name
Description
+10 V-GND +10 VDC power supply
Provide +10 VDC power supply externally. Usually, it
provides power supply to the external potentiometer with
resistance range of 1 to 5 kΩ.
Max. output current: 10 mA.
+24V-COM +24 VDC power supply
Provide +24 VDC power supply externally. Usually, it
provides power supply to DI/DO terminals and external
sensors.
Max. output current: 200 mA.
OP Input terminal of external power
supply
Connect to +24 VDC by default. Whether it connects to +24 V
or COM is decided by jumper J7. When DI1 to DI5 need to be
driven by the external signal, OP needs to be connected to
the external power supply and be disconnected from +24
VDC.
AI1-GND Analog input 1
AI1 input voltage range: 0 to 10 VDC.
Impedance: 22 kΩ.
AI2-GND Analog input 2
AI2 can be used as voltage input or current input, which is
chosen by jumper J8 on main control card.
Input range: 0 to 10 VDC or 4 to 20 mA.
Impedance: 22 kΩ if voltage input, 500 Ω if current input.
DI1-COM
Digital input 1
Optical coupling isolation, compatible with dual-polarity input.
Impedance: 2.4 kΩ.
Input voltage range: 9 to 30 VDC.
DI2-COM
Digital input 2
DI3-COM
Digital input 3
DI4-COM
Digital input 4
DI5-COM High-speed pulse input
Besides features of DI1 to DI4, it can be used for high-speed
pulse input.
Max. input frequency: 100 kHz.
AO1-GND Analog output 1
Voltage or current output, determined by jumper J5 on main
control board.
Output voltage range: 0 to 10 VDC.
Output current range: 0 to 20 mA.
DO1-CME Digital output 1
Open-collector, dual polarity output, optical coupling isolated.
Voltage range: 0 to 24 VDC.
Current range: 0 to 50 mA.
FM-COM High-speed pulse output
It is restricted by F5-00 (FM terminal output mode selection).
As a high
-speed pulse output, the maximum frequency is 100
kHz.
As an open
-collector output, its specification is the same as
that of DO1
: Voltage range: 0 to 24 VDC.
Current range
: 0 to 50 mA.
T/A-T/B
Normally closed terminal
Contact driving capacity:
250 VAC, 3 A; 30 VDC, 1 A.
T/A-T/C
Normally open terminal
NOTE: Default Drive comes with jumper between +24V → OP and CME → COM.

7
Extension RS-485 Modbus-RTU Communication Card MD38TX1
Terminals
Terminal
Terminal Name
Description
485+
RS485 positive input
RS485 communication terminal with isolation input
485-
RS485 negative input
RS485 communication terminal with isolation input
CGND
RS485 grounding
RS485 power grounding
NOTE: see below configuration of jumper
Jumper
Description
Meaning
Setting
J3
RS485 terminal resistor
matching selection
Matching
Not matching
2.2 Extension I/O Card MD38IO1
NOTE: MD38IO1 applies to the drive 3.7 kW and above only.

8
IO resource
Item
Listing
Description
Inputs
5 digital inputs;
1 analog input AI range: -10 to 10 VDC, it can be used as AI, PT100 and
PT1000 input (thermal sensor, 0 to 200°C).
Outputs
1 relay;
1 digital output;
1 analog output
Communication
RS485 interface;
RS485 supports MODBUS-RTU protocol.
Terminals
Terminal
Terminal Name
Description
+24V-COM +24 VDC power supply
Provide +24 VDC power supply externally. Usually, it
provides power supply to DI/DO terminals and external
sensors.
Max. output current: 200 mA.
OP1 Input terminal of external power
supply
Connect to +24 VDC by default. Whether it connects to +24 V
is decided by jumper J8. When DI6 to DI10 need to be driven
by the external signal, OP1 needs to be connected to the
external power supply and be disconnected from +24 VDC.
AI3-PGND Analog input 3
Optical coupling isolation, compatible with differential signal
and PT100/PT1000 temperature sensor input (0 to 200°C).
Input voltage range: -10 to 10 VDC.
Use dial switch S1 to select different input mode: Analog, or
PT1000 or PT100, must not select more than one mode at
one time.
DI6-COM
Digital input 6
Optical coupling isolation, compatible with dual-polarity input.
Impedance: 2.4 kΩ.
Input voltage range: 9 to 30 VDC.
DI7-COM
Digital input 7
DI8-COM
Digital input 8
DI9-COM
Digital input 9
DI10-COM Digital input 10
AO2-GND Analog output 2
Voltage or current output, determined by jumper J3 on
extension I/O card.
Output voltage range: 0 to 10 VDC.
Output current range: 0 to 20 mA.
Impedance range: for current output,0 to 500 Ω
DO2-CME1 Digital output 2
Multi-function and dual-polarity and open-collector output.
Voltage range: 0 to 24 VDC.
Current range: 0 to 50 mA.
485+-485- MODBUS communication terminal
MODBUS protocol.
Baud rate
: 300 to 115200 bps.
Max. nodes
: 32.
Terminal resistance dial switch
: S2.
PA-PB
Normally closed terminal
Contact driving capacity:
250 VAC, 3 A;
30 VDC, 1 A.
PA-PC Normally open terminal
CANH-CANL
CANlink communication terminal
CANlink communication.

9
NOTE: see below configuration of jumpers
Jumper
Description
J3
AO2 output mode selection: voltage or current.
J4
CAN terminal resistance selection
J7
CME1 connection mode selection: connected to COM or not.
J8
OP1 connection mode selection: connected to internal +24V or not.
S1
AI input mode selection: analog input (voltage) or PT100 or PT1000 input (both 0 to
200°C).
S2
RS485 terminal resistance selection (RTU).
NOTE: see below configuration methods for dial switch S1:
S1 Configuration
AI Input Mode
Analog input (voltage).
PT1000 thermal sensor (0 to 200°C).
PT100 thermal sensor (0 to 200°C).

10
Extension Mini I/O Card MD38IO2
Terminals
Terminal
Terminal Name
Description
+24V-COM +24 VDC power supply
Provide +24 VDC power supply externally. Usually, it
provides power supply to DI/DO terminals and external
sensors.
Max. output current: 170 mA.
OP2 Input terminal of external power
supply
Connect to +24 VDC by default. Whether it connects to +24 V
is decided by jumper J2. When DI6 to DI8 need to be driven
by the external signal, OP2 needs to be connected to the
external power supply and be disconnected from +24 VDC.
DI6-COM
Digital input 6
Optical coupling isolation, compatible with dual-polarity input.
Impedance: 2.4 kΩ.
Input voltage range: 9 to 30 VDC.
DI7-COM
Digital input 7
DI8-COM
Digital input 8
NOTE: see below configuration of jumper
Jumper
Description
Meaning
Setting
J2
OP2 connecting mode
selection
If DI connected in SINK
mode, OP2 connected to
+24V
If DI connected in
SOURCE mode, OP2
connected to COM

11
3 Operation Panel
3.1 Get Familiar With Operation Panel
Overview
RUN LOCAL/REMOT FED/REV TUNE/TC
RPM %
AV Hz
PRG ENTER
RUN STOP
RES
MF.K
QUICK
Command source indicator
ON: terminal;
OFF: operation panel;
BLINK: communication.
Running direction indicator
ON: reverse;
OFF: forward
Running state indicator
ON: running;
OFF:stop.
LED display for parameters
Program key
Menu mode selection key
Run key
Multi-function selection key
Stop/Reset key
Shift key
Increment key
Decrement key
Confirm key
Parameter unit indicator
Other states indicator
ON: torque control;
BLINK slowly: motor auto-tuning;
BLINK quickly: fault state.
Mounting hole
Mounting hole
Parameter unit indicator
Indicator Appearance
Meaning
RPM %
A VHz
Hz for frequency
RPM %
A VHz
A for current
RPM %
A VHz
V for voltage
RPM %
A VHz
% for anything relevant

12
Keys on operation panel
Key
Key Name
Function
PRG
Programming Enter or exit Level I menu.
ENTER
Confirm Enter the menu interfaces level by level, and confirm the parameter setting.
Increment Increase data or function code.
Decrement Decrease data or function code.
Shift Select the displayed parameters in turn in the stop or running state, and select
the digit to be modified when modifying parameters.
RUN
RUN Start the AC drive in the keypad operation mode.
STOP
RES
Stop/Reset Stop the AC drive when it is in the running state and perform the reset
operation when it is in the faulty state. The functions of this key are restricted
by F7-02
MF.K
Multifunction Perform function switchover (such as quick switchover of command source or
direction) according to the setting of F7-01.
QUICK
Menu mode
selection Perform switchover between menu modes according to the setting of FP-03.
Relevant parameters for operation panel setting
Function
Code
Parameter Name
Setting Range
Unit
Default
Commissio
n
F7-01
MF.K key function
selection
0: MF.K key disabled
1: Switchover from remote control
(terminal or communication) to
keypad control
2: Switchover between forward
rotation and reverse rotation
3: Forward jog
4: Reverse jog
5: Individualized parameter display
N.A. 0 0
F7-02
STOP/RESET key
function
0: STOP/RESET key enabled only in
keypad control
1: STOP/RESET key enabled in any
operation mode N.A. 1 1
FP-03 Parameter display
property For user defined and user modified parameters
00: non of them will display
01: user defined parameters will
display
10: user modified parameters will
display
11: both of them will display
N.A. 00

13
Operations of parameters
F0
U0
AC
…
A1
A0
FP
F0
28
… … 2
F1
F0
01
0
F0
02
50.00 F0
F0
F0
00
2
U0
F0
28
AC …
…
F0
00
A1
A0
FP
…
F1
F0
Parameter arrangement
Function Code Group
Description
Remark
F0 to FF Standard function code group Standard function parameters
A0 to AC Advanced function code group Special parameters for solar pump
application
U0 Running state function code group Display of state-monitoring parameters
ENTER
PRG
PRG
ENTER
ENTER
PRG
PRG
ENTER
PRG
PRG

14
4 Quick Setup
4.1 Setup Flowchart
START
Para
Parameter Name
Default
Commissioning
Ahead of setup
Default values are elicited from enormous real elevator applications,
so users can rely on them usually, only some adjustments are
necessary.
If parameter restoration is prohibited due to some reasons, then the
following steps have to be followed one by one.
Remove DI wirings
Usually if any DI is set as Forward or Reverse run and if signal is
active, then some operations cannot succeed, such as restoring
parameters, changing command source, which are necessary steps
for quick setup. So it’s seriously recommended to remove DI wirings
at the beginning of commissioning.
Restore parameters
FP-01
Parameter operation
0
1
0: No operation
1: Restore default settings except motor parameters
2: Clear records including errors
4: Restore user’s backup parameters
501: Backup parameters
NOTE: Usually people have no idea what parameters have been changed, so it’s
seriously recommended to restore parameters to default at the beginning of
commissioning.
Set motor parameters
Motor Nameplate
F1-01
Rated motor power
model
dependent
Unit: kW
F1-02
Rated motor voltage
380
Unit: V
F1-03
Rated motor current
model
dependent
Unit: A
F1-04
Rated motor frequency
50.00
Unit: Hz
F1-05
Rated motor speed
1460
Unit: rpm
CONTINUE
Para
Parameter Name
Default
Commissioning

15
CONTINUE
Para
Parameter Name
Default
Commissioning
Select command source
F0-02
Command source selection
1
0
0: Operation panel control (indicator ‘LOCAL/REMOT’ OFF)
1: Terminal control (indicator ‘LOCAL/REMOT’ ON)
2: Communication control (indicator ‘LOCAL/REMOT’ blinking)
3 : Water tank level detection control
Perform motor auto tuning
F1-37
Auto-tuning selection
0
3
0: No auto-tuning
2: Asynchronous motor dynamic auto-tuning
3: Asynchronous motor static auto-tuning (NEW)
NOTE: Motor won’t rotate at this stage.
Steps of auto-tuning:
1. Make sure the UVW connection between inverter and motor is not cut off by
output contactor; if it is cut off, then manually handle with the output contactor;
3. Set F1-37=3, press , then LED on panel will display letters ’TUNE’;
4. Press the key on panel, then motor starts auto-tuning, it usually takes about
30 seconds to finish this auto-tuning, wait until LED stops displaying ‘TUNE’;
Select Control mode
F0-01
Control mode selection
2
0 or 2
0: SVC control
2: VF control
Select frequency reference
source
F0-03
Main frequency source X
selection
8
8
0: Digital setting F0-08
1: Digital setting F0-08
2: AI1
3: AI2
4: AI3
5: Pulse setting (DI5)
6: Multi-reference setting
7: Simple PLC
8: MPPT control mode for solar pump
9: Communication setting
Set start-up voltage
A9-09
Start-up voltage
220 V: 300.0;
380 V: 550.0
Note: The minimum voltage that allows the system start-up
Set shutdown voltage
A9-10
Shutdown voltage
220 V: 200.0;
380 V: 300.0
Note: When the DC bus voltage of AC drive is below A9-10, the
drive will freely stop.
Set output power upper limit
A9-08
System output power upper limit
1.0KW
Note: The purpose of setting A9-08 is to limit the system output
power to prevent the pump overload and burned down. When A9-
08 = 0.0, it means no protection for pump overload.
OVER

16
4.2 MPPT Fine-Tuning
Function Code
Parameter Name
Setting Range
Unit
Default
Modbus Address
A9-00
The minimum value of PID
proportional coefficient
0.1 to 900.0
N.A 40.0 0xA900
A9-02
The maximum value of PID
proportional coefficient
0.1 to 900.0
N.A 200.0 0xA902
Proportional Gain P: Decide the adjustment strength of entire PID regulator, the larger P value is, the larger the adjust
intensity is. When the parameter is 10,000, that is to say when the deviation between the amount of feedback and the
amount of given is 100 %, the output frequency can be up to the maximum amplitude value adjusted by PID regulator.
The rule of PID proportional coefficient varies from the minimum value (A9-00) to the maximum value (A9-02) as
follows:
Figure 4-1 PID scale factor changing relationships
Function Code
Parameter Name
Setting Range
Unit
Default
Modbus Address
A9-01
The maximum
value of PID
integral time
0.01 to 90.00
N.A 2.00 0xA901
A9-03
The minimum
value of PID
integral time
0.01 to 90.00
N.A 0.12 0xA903
Both of above parameters are used for deciding integral adjusting speed of PID regulator to overcome the deviation
between the amount of feedback and the amount of given. When the deviation between the amount of feedback and
the amount of given is 100 %, the adjusting amount of integral regulator (Ignore proportional and differential role) will
be up to the maximum frequency (F0-10) after the integral time. The shorter the integral time is, the stronger the
regulation intensity is.
The rule of PID integral time varies from the maximum value (A9-01) to the minimum value (A9-03) as follows:
Deviation between feedback and given
A9-00
A9-02
Proportional coefficient of PID

17
Figure 4-2 PID integral time variation rule
For the first time while the system is being used, the factory default parameters may not be able to adapt to on-site
use, when the following situations occur, you can refer the solution as below. Based on actual use on-site, once
successfully operates, the system has fully automatic and unattended features, there is no need to adjust any more.
Figure 4-3 The sunshine suddenly turns weak and the system stops
Function Code
Parameter Name
Setting Range
Unit
Default
Modbus Address
A9-04
Right MPPT tracking step
0.0 to 10.0
V
0.6
0xA904
A9-05
Left MPPT tracking step
0.0 to 10.0
V
1.5
0xA905
A9-06
MPPT tracking time
0 to 60,000
ms
200
0xA906
By setting A9-04, A9-05, A9-06, it can adjust MPPT tracking speed.
MPPT tracking step: Used to set increase (decrease) voltage amplitude of each time left (right) side searching the
best DC bus voltage for tracking the Maximum Output Power. The larger the value is, the faster the searching speed
is. When the parameter setting is too large, it is easy to cause oscillation near the maximum power point.
Y
Y
The sunshine suddenly turns weak
If the system stops?
Increase Min. proportional
coefficient (A9-00) and reduce Min.
integral time (A9-01)
Is it normal?
END
N
N
Deviation between feedback and given
A9-03
A9-01
PID integral time

18
MPPT tracking time: Used to set up the interval time of each tracking step. The shorter the tracking time is, the faster
the tracking speed is, too short, may also cause oscillations.
Note: When the system is at oscillating state, it will significantly reduce solar energy utilization efficiency.
Figure 4-4 The output frequency oscillates when steady state operation
Function Code
Parameter Name
Setting Range
Unit
Default
Modbus Address
A9-07
The minimum value of
DC bus voltage for
MPPT
100.0 to 800.0
V
220 V:
240.0
380 V:
440.0
0xA907
By setting A9-07 to prevent the case: When the cloudy or evening (morning), the solar panels output voltage is low,
thus the DC bus voltage will be too low by the normal MPPT tracking method and it may cause the system under-
voltage shutdown.
Figure 4-5 The sunshine is weak, the system repeatedly starts and stops
If the system repeatedly starts and
Y
Is it normal?
Y
END
N
N
The sunshine is weak
Increase MPPT tracking
Min. DC bus voltage (A9-07)
Is it normal?
N
Y
System steady state operation
If the output frequency oscillation greater than 2HZ
Y
Reduce the search step of MPPT (A9-04, A9-05) and increase
the tracking time of every step of MPPT (A9-06)
Is it normal?
Y
END
N
N