INVT Goodrive100-PV Series User manual

Goodrive100-PV Series Solar Pump Inverter Contents
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Contents
Contents....................................................................................................................................i
1 Safety precautions ...............................................................................................................1
1.1 Safety definition.............................................................................................................1
1.2 Warning .........................................................................................................................1
1.3 Safety guidelines ...........................................................................................................2
1.3.1 Delivery and installation........................................................................................2
1.3.2 Commissioning and running .................................................................................3
1.3.3 Maintenance and component replacement ..........................................................3
1.3.4 Scrap treatment ....................................................................................................4
2 Product overview..................................................................................................................5
2.1 Unpacking inspection ....................................................................................................5
2.2 Product nameplate ........................................................................................................5
2.3 Model designation code.................................................................................................5
2.4 Product specifications....................................................................................................6
2.5 Product ratings ..............................................................................................................6
3 Installation guidelines..........................................................................................................8
3.1 Mechanical installation ..................................................................................................8
3.1.1 Installation environment........................................................................................8
3.1.2 Installation direction..............................................................................................9
3.1.3 Installation mode.................................................................................................10
3.2 Standard wiring............................................................................................................11
3.2.1 Main circuit terminals..........................................................................................11
3.2.2 Control circuit terminals ......................................................................................13
4 Keypad operation guidelines ............................................................................................15
4.1 Keypad introduction.....................................................................................................15
4.2 Keypad display ............................................................................................................17
4.2.1 Displaying stopped-state parameters.................................................................17
4.2.2 Displaying running-state parameters..................................................................17
4.2.3 Displaying fault information.................................................................................18
4.2.4 Editing function codes.........................................................................................18
4.3 Operation procedure....................................................................................................18
4.3.1 Modifying function codes ....................................................................................18
4.3.2 Setting a password for the inverter.....................................................................19
4.3.3 Viewing inverter status........................................................................................19
5 Commissioning guidelines................................................................................................20
5.1 Check before running ..................................................................................................20
5.2 Trial run........................................................................................................................20

Goodrive100-PV Series Solar Pump Inverter Contents
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5.3 Parameter settings ......................................................................................................20
5.4 Advanced settings .......................................................................................................20
5.4.1 Water discharge speed PI adjustment................................................................20
5.4.2 Special settings for single phase motors............................................................21
6 Function parameter list......................................................................................................22
6.1 Function parameters related to control........................................................................22
P00 group Basic functions...........................................................................................22
P01 group Start and stop control.................................................................................25
P02 group Parameters of motor 1 ...............................................................................26
P04 group Space voltage vector control......................................................................27
P05 group Input terminals............................................................................................31
P06 group Output terminals.........................................................................................32
P07 group Human-machine interface..........................................................................34
P08 group Enhanced functions....................................................................................38
6.2 Function parameters special for solar pump ...............................................................38
P11 group Protection parameters................................................................................38
P15 group Functions special for solar inverter............................................................39
P17 group Status viewing............................................................................................49
P18 group Status viewing functions special for solar inverters ...................................49
P19 group Functions for voltage boost (inverter module communicates with boost
module through RS485 communication) .....................................................................50
7 Fault diagnosis and solution.............................................................................................52
Appendix A Options ..............................................................................................................58
A.1 Boost module ..............................................................................................................58
A.2 GPRS module and monitoring APP ............................................................................59
A.3 Cable...........................................................................................................................60
A.3.1 Power cable........................................................................................................60
A.3.2 Control cable ......................................................................................................60
A.4 Reactor........................................................................................................................62
A.5 Filter ............................................................................................................................63
Appendix B Recommended solar module configuration ..................................................64
B.1 Recommended solar module configuration for solar pump inverters..........................64
B.2 Recommended solar module configuration for inverters with boost module ..............65
Appendix C Power frequency & PV switching solution ....................................................66
C.1 Solution introduction ...................................................................................................66
C.1.1 QH100-PV switching module .............................................................................66
C.1.2 Model selection reference for low-voltage apparatuses.....................................68
C.2 IP54 protection-level inverters ....................................................................................69
C.3 Wiring description .......................................................................................................71
C.4 Parameter setting method...........................................................................................72

Goodrive100-PV Series Solar Pump Inverter Contents
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Appendix D Dimension drawings ........................................................................................73
D.1 External keypad structure ...........................................................................................73
D.2 Dimensions of 0.4-2.2kW models...............................................................................74
D.3 Dimensions of 1.5-200kW models..............................................................................76
Appendix E Further information ..........................................................................................79
E.1 Product and service quiries.........................................................................................79
E.2 Feedback of INVT inverter manuals............................................................................79
E.3 Document library on the Internet.................................................................................79

Goodrive100-PV Series Solar Pump Inverter Safety precautions
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1 Safety precautions
Please read this manual carefully and follow all safety precautions before moving, installing,
operating and servicing the inverter. If ignored, physical injury or death may occur, or damage
may occur to the devices.
If any physical injury or death or damage to the devices occurs for ignoring to the safety
precautions in the manual, our company will not be responsible for any damages and we are
not legally bound in any manner.
1.1 Safety definition
Danger:
Serious physical injury or even death may occur if not follow
relevant requirements
Warning:
Physical injury or damage to the devices may occur if not follow
relevant requirements
Note:
Physical hurt may occur if not follow relevant requirements
Qualified
electricians:
People working on the device should take part in professional
electrical and safety training, receive the certification and be
familiar with all steps and requirements of installing,
commissioning, operating and maintaining the device to avoid
any emergency.
1.2 Warning
Warnings caution you about conditions which can result in serious injury or death and/or
damage to the equipment, and advice on how to avoid the danger. Following warning symbols
are used in this manual:
Symbols
Name
Instruction
Abbreviation
Danger
Danger
Serious physical injury or even
death may occur if not follow the
relative requirements
Warning
Warning
Physical injury or damage to the
devices may occur if not follow the
relative requirements
Forbid
Electrostatic
discharge
Damage to the PCBA board may
occur if not follow the relative
requirements
Hot sides
Hot sides
Sides of the device may become
hot. Do not touch.
Note
Note
Physical hurt may occur if not
follow the relative requirements
Note

Goodrive100-PV Series Solar Pump Inverter Safety precautions
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1.3 Safety guidelines
Only qualified electricians are allowed to operate on the inverter.
Do not carry out any wiring and inspection or changing components
when the power supply is applied. Ensure all input power supply is
disconnected before wiring and checking and always wait for at least the
time designated on the inverter or until the DC bus voltage is less than
36V. Below is the table of the waiting time:
Inverter model
Minimum waiting time
1PH 220V
0.4kW-2.2kW
5 minutes
3PH 220V
1.5kW-7.5kW
5 minutes
3PH 380V
0.75kW-110kW
5 minutes
3PH 380V
132kW-200kW
15 minutes
Do not refit the inverter unauthorized; otherwise fire, electric shock or
other injury may occur.
The base of the radiator may become hot during running. Do not touch to
avoid hurt.
The electrical parts and components inside the inverter are electrostatic.
Take measurements to avoid electrostatic discharge during relevant
operation.
1.3.1 Delivery and installation
Please install the inverter on fire-retardant material and keep the inverter
away from combustible materials.
Do not operate on the inverter if there is any damage or components
loss to the inverter.
Do not touch the inverter with wet items or body, otherwise electric shock
may occur.
Note:
Select appropriate moving and installing tools to ensure a safe and normal running of the
inverter and avoid physical injury or death. For physical safety, the erector should take
some mechanical protective measurements, such as wearing safety shoes and working
uniforms.
Do not carry the inverter by its cover. The cover may fall off.
Ensure to avoid physical shock or vibration during delivery and installation.
Install away from children and other public places.
The leakage current of the inverter may be above 3.5mA during operation. Ground with
proper techniques and ensure the grounding resistor is less than 10Ω. The conductivity of

Goodrive100-PV Series Solar Pump Inverter Safety precautions
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PE grounding conductor is the same as that of the phase conductor (with the same cross
sectional area).
(+) and (-) are DC power supply input terminals. R, S and T (L,N) are AC power supply
input terminals. U, V and W are output terminals. Please connect the input power cables
and motor cables with proper techniques; otherwise the damage to the inverter may
occur.
1.3.2 Commissioning and running
Disconnect all power supplies applied to the inverter before the terminal
wiring and wait for at least the designated time after disconnecting the
power supply.
High voltage is present inside the inverter during running. Do not carry
out any operation except for the keypad setting.
The inverter cannot be used as “Emergency-stop device”.
If the inverter is used to break the motor suddenly, a mechanical braking
device shall be provided.
Note:
Do not switch on or off the input power supply of the inverter frequently.
For inverters that have been stored for a long time, check and fix the capacitance and try
to run it again before utilization.
Cover the front board before running, otherwise electric shock may occur.
1.3.3 Maintenance and component replacement
Only qualified electricians are allowed to perform the maintenance,
inspection, and components replacement of the inverter.
Disconnect all power supplies to the inverter before the terminal wiring.
Wait for at least the time designated on the inverter after disconnection.
Take measures to avoid screws, cables and other conductive materials
to fall into the inverter during maintenance and component replacement.
Note:
Please select proper torque to tighten screws.
Keep the inverter, parts and components away from combustible materials during
maintenance and component replacement.
Do not carry out any isolation voltage-endurance test on the inverter and do not measure
the control circuit of the inverter by megameter.

Goodrive100-PV Series Solar Pump Inverter Safety precautions
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1.3.4 Scrap treatment
There are heavy metals in the inverter. Deal with it as industrial effluent.
When the life cycle ends, the product should enter the recycling system.
Dispose of it separately at an appropriate collection point instead of
placing it in the normal waste stream.

Goodrive100-PV Series Solar Pump Inverter Product overview
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2 Product overview
2.1 Unpacking inspection
Check as follows after receiving products:
1. Check that there are no damage and humidification to the package. If not, please
contact with local agents or INVT offices.
2. Check the information on the type designation label on the outside of the package to
verify that the drive is of the correct type. If not, please contact with local dealers or
INVT offices.
3. Check that there are no signs of water in the package and no signs of damage or
breach to the inverter. If not, please contact with local dealers or INVT offices.
4. Check the information on the type designation label on the outside of the package to
verify that the name plate is of the correct type. If not, please contact with local
dealers or INVT offices.
5. Check to ensure the accessories (including user’s manual and control keypad) inside
the device is complete. If not, please contact with local dealers or INVT offices.
2.2 Product nameplate
Shenzhen INVT Electric Co., Ltd.
IP20
S/N: Made in china
Model: GD100-2R2G-S2-PV
Power(Output): 2.2kW
Input: DC 150V-440V
AC 1PH 220V (-15%)-240V (+10%) 24A 47 Hz-63Hz
Output: AC 3PH 0V-Uinput 10A 0Hz-400Hz
Note: This is a nameplate example of a standard inverter product. The CE/TUV/IP20 marking
on the top right will be marked according to actual certification conditions.
2.3 Model designation code
A model designation code contains product information. You can find the model designation
code on the inverter nameplate and simplified nameplate.
GD100 –5R5G –4 5 –PV
① ② ④③ ⑤

Goodrive100-PV Series Solar Pump Inverter Product overview
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Field
No.
Description
Content
Abbreviation
of product
series
①
Abbreviation
of product
series
GD is short for Goodrive.
Rated power
②
Power range
+ Load type
5R5G—5.5kW
G—Constant torque load
Voltage class
③
Voltage class
4: AC 3PH 380V (-15%)–440(+10%)
2: AC 3PH 220V (-15%)–240(+10%)
S2: AC 1PH 220V (-15%)–240(+10%)
SS2: AC 1PH input/output 220V (-15%)–
240(+10%)
Protection
level
④
Protection
level
Protection level.
5—IP54
The protection level of a standard
inverter is IP20, but this field is not
displayed.
Industrial
code
⑤
Industry
code
PV: Photovoltaic water pump series
products
2.4 Product specifications
Model
-SS2
-S2
-2
-4
AC input voltage (V)
220 (-15%)–240
(+10%) (1PH)
220 (-15%)–
240 (+10%)
(3PH)
380 (-15%)–
440 (+10%)
(3PH)
Max. DC voltage (V)
440
440
440
800
Start-up voltage (V)
200
200
200
300
Min. working voltage (V)
150
150
150
250
Recommended DC input
voltage range (V)
200–
400
200–
400
200–400
300–750
Recommended MPP voltage
(V)
330
330
330
550
2.5 Product ratings
Series
Model
Rated
output
power
(kW)
Rated
input
current (A)
Rated output
current (A)
Max. DC input
current (A)
-SS2 model
1PH 220V
GD100-0R4G-SS2-PV
0.4
6.5
4.2
9
GD100-0R7G-SS2-PV
0.75
9.3
7.2
9

Goodrive100-PV Series Solar Pump Inverter Product overview
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Series
Model
Rated
output
power
(kW)
Rated
input
current (A)
Rated output
current (A)
Max. DC input
current (A)
Input/output
(0.4-2.2 kW)
GD100-1R5G-SS2-PV
1.5
15.7
10.2
12
GD100-2R2G-SS2-PV
2.2
24
14
12
-S2 model
1PH 220V
input
(0.4-2.2 kW)
GD100-0R4G-S2-PV
0.4
6.5
2.5
9
GD100-0R7G-S2-PV
0.75
9.3
4.2
9
GD100-1R5G-S2-PV
1.5
15.7
7.5
12
GD100-2R2G-S2-PV
2.2
24
10
12
-2 model
3PH 220V
(1.5-7.5kW)
GD100-1R5G-2-PV
1.5
7.7
7.5
12
GD100-2R2G-2-PV
2.2
11
10
12
GD100-004G-2-PV
4
17
16
20
GD100-5R5G-2-PV
5.5
25
20
30
GD100-7R5G-2-PV
7.5
33
30
40
-4 model
3PH 380V
(0.75-200kW)
GD100-0R7G-4-PV
0.75
3.4
2.5
9
GD100-1R5G-4-PV
1.5
5.0
4.2
9
GD100-2R2G-4-PV
2.2
5.8
5.5
12
GD100-004G-4-PV
4.0
13.5
9.5
16.5
GD100-5R5G-4-PV
5.5
19.5
14
23.9
GD100-7R5G-4-PV
7.5
25
18.5
30.6
GD100-011G-4-PV
11
32
25
39.2
GD100-015G-4-PV
15
40
32
49
GD100-018G-4-PV
18.5
47
38
50
GD100-022G-4-PV
22
51
45
60
GD100-030G-4-PV
30
70
60
81
GD100-037G-4-PV
37
80
75
90
GD100-045G-4-PV
45
98
92
130
GD100-055G-4-PV
55
128
115
150
GD100-075G-4-PV
75
139
150
200
GD100-090G-4-PV
90
168
180
250
GD100-110G-4-PV
110
201
215
300
GD100-132G-4-PV
132
265
260
360
GD100-160G-4-PV
160
310
305
430
GD100-185G-4-PV
185
345
340
500
GD100-200G-4-PV
200
385
380
550

Goodrive100-PV Series Solar Pump Inverter Installation guidelines
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3 Installation guidelines
The chapter describes the mechanical installation and electric installation.
Only qualified electricians are allowed to carry out what described in this
chapter. Please operate as the instructions in Safety precautions.
Ignoring these may cause physical injury or death or damage to the
devices.
Ensure the power supply of the inverter is disconnected during the
operation. Wait for at least the time designated after the disconnection if
the power supply is applied.
The installation and design of the inverter should be complied with the
requirement of the local laws and regulations in the installation site. If the
installation infringes the requirement, our company will exempt from any
responsibility. Additionally, if users do not comply with the suggestion,
some damage beyond the assured maintenance range may occur.
3.1 Mechanical installation
3.1.1 Installation environment
The installation environment is the safeguard for a full performance and long-term stable
functions of the inverter. Check the installation environment as follows:
Environment
Conditions
Installation site
Indoors.
Ambient
temperature
-10°C–+50°C, and air temperature change shall be less than
0.5°C/minute.
When the ambient temperature exceeds 40˚C, derate 1% for
every increase of 1˚C.
Do not use the inverter when the ambient temperature exceeds
50°C.
To improve reliability, do not use the inverter in the places where
the temperature changes rapidly.
When the inverter is used in a closed space such as control
cabinet, use a cooling fan or air conditioner for cooling,
preventing the internal temperature from exceeding the
temperature required.
When the temperature is too low, if you want to use the inverter
that has been idled for a long time, it is required to install an
external heating device before the use to eliminate the freeze
inside the inverter. Otherwise, the inverter may be damaged.

Goodrive100-PV Series Solar Pump Inverter Installation guidelines
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Environment
Conditions
Humidity
The relative humidity (RH) of the air is less than 90%.
Condensation is not allowed.
Storage
temperature
-40°C–+70°C, with the air temperature change rate less than
1°C/minute.
Running
environment
Install the inverter in a place:
Away from electromagnetic radiation sources.
Away from oil mist, corrosive gases and combustible gases.
Without the chance for foreign objects such as metal powder,
dust, oil and water to fall into the inverter (do not install the
inverter onto combustible objects such as wood).
Without radioactive substances and combustible objects.
Without hazard gases and liquids.
With low salt content.
Without direct sunlight.
Pollution degree
Degree 2
Altitude
Lower than 1000m;
When the altitude exceeds 1000m, derate 1% for every increase
of 1˚C.
When the altitude exceeds 3000m, consult the local INVT dealer
or office.
Vibration
Max. vibration acceleration: 5.8m/s2(0.6g)
Installation
direction
Install the inverter vertically to ensure good heat dissipation
performance.
Note:
The inverter must be installed in a clean and well-ventilated environment based on the IP
level.
The cooling air must be clean enough and free from corrosive gases and conductive dust.
3.1.2 Installation direction
The inverter may be installed on the wall or in a cabinet.
The inverter needs be installed in the vertical position. Check the installation site according to
the requirements below. See Appendix D Dimension drawings for frame details.

Goodrive100-PV Series Solar Pump Inverter Installation guidelines
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3.1.3 Installation mode
(1) The inverters ≤2.2kW support wall mounting and rail mounting.
a) Wall mounting b) Rail mounting
Note: The minimum space of Aand B is 100mm. H is 36.6mm and W is 35.0mm.
(2) The inverters ≥4kW support wall mounting and flange mounting.
Flange
1. Mark the locations of installation holes. For details about the holes, see the inverter
dimension diagram in the appendix.
2. Fix the screws or bolts into the marked locations.
3. Lean the inverter against the wall.
4. Fasten the tightening screws on the wall.

Goodrive100-PV Series Solar Pump Inverter Installation guidelines
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3.2 Standard wiring
3.2.1 Main circuit terminals
The figure below shows the standard wiring of inverter.
Well
S2
S3
COM
GD100-PV
inverter
High water level switch
Low water level switch
Common terminal
Water
tower
S1
S4
COM
Forced switch to mains
1PH/2PH algorithm
shifting
Common terminal
(+) (-)
Q1
PV input
U V W
Water
pump
The DC breaker Q1 must be installed as the protection switch for PV
input.
In parallel connection, the combination box special for PV must be used.
When the distance between the PV input component and inverter
exceeds 10 meters, Type-II surge protection devices must be configured
at the DC side.
When the distance between the pump and inverter exceeds 50 meters,
it is recommended to configure output reactors. See appendix A.4 for
the output reactor model selection.
The inverter automatically runs after being powered on. If parameters
need to be set, follow the parameter setting instructions in chapter 5.

Goodrive100-PV Series Solar Pump Inverter Installation guidelines
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Terminal
Name
Function
R, S, T
(L, N)
AC input
3PH (1PH) AC input terminals, connected to the grid
Note: Use the screws equipped with the inverter for
wiring.
(+), (-)
PV input
Solar cell panel input terminals
U, V, W
Inverter
output
3PH/1PH AC output terminals, connected to the pump
motor
Note: 1PH motors must connect to terminals U and W.
Safety
grounding
Safety protection grounding terminal. Each inverter
must be grounded
Description for -SS2 single-phase output models
1) Generally, the output terminals U and W of the inverter connect to the phase cables of the
single-phase motor.
2) If the single-phase pump cannot be started, the two-phase control method must be used,
and the start-up and running capacitors (if any) of the motor must be removed. The figure
below shows the internal wiring of the common single-phase motor. In the figure, L1, L2, C1,
and C2 indicate the running winding, start-up winding, running capacitor, and start-up
capacitor. When the motor speed exceeds 75% of the rated speed, the start-up capacitor is
switched off.
U1
U2
V2
V1
L
N
L1
L2
C1
C2
K
Internal wiring of the single-phase motor winding after removing the starting and running
capacitor:

Goodrive100-PV Series Solar Pump Inverter Installation guidelines
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U1
U2
V2
V1
L1
L2
C1
C2
W
U
V
U1
U2
V2
V1
L1
L2
L
N
K
U1 and V1 are the common terminals of the windings. Connect them to the output terminal W
of the solar pump inverter. Connect U2 to the output terminal U of the inverter. Connect V2 to
the output terminal V of the inverter. (Note: Use the screws equipped with the inverter.)
Connect S4 of the inverter to COM in short circuited manner.
3.2.2 Control circuit terminals
Category
Terminal
symbol
Terminal name
Terminal function
Power supply
24V
24V power supply
It provides the power of 24V±10%
and maximum current of 200mA.
It functions as the working power
supply of digital input and output or
externally connects to the sensor
power supply.
COM
Common terminal
Digital input
S1
Forced switch to
power frequency
Terminal feature parameters:
1. Internal impedance: 3.3kΩ
2. Acceptable voltage input: 12–24V
3. Maximum input frequency: 1kHz
S1: Forcible switch to power
frequency (Switching-on indicates
switching to power frequency, and
switching-off indicates input
controlled by the keypad.)
S2: It connects to the high-water
switch of the normally open contact
by default.
S3: It connects to the low-water
switch of the normally closed
contact.
S2
Full-water alarm
S3
Empty-water alarm
S4
Single/two phase
algorithm switching

Goodrive100-PV Series Solar Pump Inverter Installation guidelines
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Category
Terminal
symbol
Terminal name
Terminal function
S4: A high electrical level
corresponds to the single-phase
algorithm. A low electrical level
corresponds to the two-phase
algorithm.
Communication
RS485+
RS485-
485 communication
485 communication terminals, using
the Modbus protocol
422TX+
422TX-
422RX+
422RX-
422 communication
Communication terminals special
for the boost module.
Relay output
RO1A
(ROA)
Normally open
contact of relay 1
1. Contact capacity: 3A/AC250V,
1A/DC30V
2. They cannot be used for high
frequency switch output.
During the application of auto power
frequency & PV switching, the AC
input contactor coil is controlled by
the normally closed contact of the
relay.
RO1B
(ROB)
Normally closed
contact of relay 1
RO1C
(ROC)
Common terminal of
relay 1

Goodrive100-PV Series Solar Pump Inverter Keypad operation guidelines
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4 Keypad operation guidelines
4.1 Keypad introduction
The keypad is used to control the inverter, read inverter status, and set parameters. If you
need to install the keypad on another position rather than on the inverter, use a keypad
extension cable with a standard RJ45 crystal head.
Figure 4–1 Keypad diagram for inverters of ≤2.2kW
1
2
4
3
PRG
ESC DATA
QUICK
JOG SHIFT
RUN STOP
RST
RUN/TUNE FWD/REV LOCAL/REMOT TRIP
HZ
A
V
RPM
%
Figure 4–2 Keypad diagram for inverters of ≥4kW
Note: The inverter models of ≤2.2kW support an optional extermal keypad, and the keypad of
inverter models of ≥4kW can be installed on another device.
No.
Item
Description
1
Status
indicator
RUN/TUNE
Inverter running status indicator.
Off: The inverter is stopped.

Goodrive100-PV Series Solar Pump Inverter Keypad operation guidelines
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No.
Item
Description
Blinking: The inverter is autotuning parameters.
On: The inverter is running.
FWD/REV
Forward or reverse running indicator.
Off: The inverter is running forward.
On: The inverter is running reversely.
LOCAL/REMOT
Indicates whether the inverter is controlled through
the keypad, terminals, or communication.
Off: The inverter is controlled through the keypad.
Blinking: The inverter is controlled through
terminals.
On: The inverter is controlled through remote
communication.
TRIP
Fault indicator
Off: in normal state
Blinking: in pre-alarm state
On: in fault state
2
Unit
indicator
Mean the unit displayed currently
Hz
Frequency unit
RPM
Rotating speed unit
A
Current unit
％
Percentage
V
Voltage unit
3
Digital
display
zone
Five-digit LED displays various monitoring data and alarm codes such as
the frequency setting and output frequency.
Display
Means
Display
Means
Display
Means
Display
Means
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
a
A
b
B
c
C
d
D
e
E
f
F
h
H
i
I
l
L
N
n
n
o
p
P
r
r
s
S
t
t
u
U
v
v
.
-
-
4
Keys
PRG
ESC
Programming
key
Press it to enter or exit level-1 menus or delete a
parameter.