Emheater EM-GW Series User manual

Preface
Thanks for your using EMHEATER EM-GW series motor soft starter, this product is used for three-phase
squirrel cage induction motor soft starting and soft stopping control. Before using, please carefully read and
understand the contents of this manual.
In the process of using the soft starter, please note the following Safety Clauses:
Please check this user manual carefully before using the product.
Only the technical person is allowed to install the product.
To be sure that the motor is correctly matched with the soft starter.
It is forbidden to connect capacitors to the output terminals (U V W).
Please seal the terminal switch insulation glue after finishing connect them.
The soft starter and its enclosures must be fixedly earthed.
During the maintenance and repair, the input must be off-power.
PRODUCT UNPACKING INSPECTION
Please check up the products before using, if in some problems; please do not hesitate to contact us with any
request for additional information.
⚫Check-up the type of product whether it is the right one you order.
⚫Check any damage to the product because of the transport, such as the spare parts are apart from the
main body or the shell be damage etc.
⚫Check others, including the user's manual.
This user manual content may be changed due to technical reasons or modified. We reserve the updating right.
Version 3.0.0

Table of Contents
1. Products Information............................................................................................................................................... 1
1.1 Motor Soft Starter ............................................................................................................................................. 1
1.2 Main Function................................................................................................................................................... 1
1.3 Technical Specification..................................................................................................................................... 2
2. Products Explanation and Installation ..................................................................................................................... 3
2.1 Model Explanation............................................................................................................................................ 3
2.2 Installation Environment................................................................................................................................... 3
2.3 Installation requirement .................................................................................................................................... 3
2.4 ProductsAppearance and Installation Dimension............................................................................................. 4
2.5 Peripheral Devices Connection Diagram.......................................................................................................... 5
2.6 Control Circuit Terminal Description................................................................................................................ 6
3. Operation and Display............................................................................................................................................. 7
3.1 Key Panel and Operation................................................................................................................................... 7
3.2 Description of Function Codes.......................................................................................................................... 9
3.3 Fault Diagnosis and Solution.......................................................................................................................... 12
4. Protection Functions and Directions...................................................................................................................... 13
4.1 Protection Function......................................................................................................................................... 13
4.2 Protection Classes and Explanation ................................................................................................................ 13
5. Test Run and Application...................................................................................................................................... 15
5.1 Power on to Test Running............................................................................................................................... 15
5.2 Starting Mode and Application....................................................................................................................... 15
5.3 Stopping mode and Application...................................................................................................................... 17
5.4 Special Application ......................................................................................................................................... 18
5.5 Application Examples..................................................................................................................................... 18
6. Online Soft Starter Cabinet.................................................................................................................................... 19
6.1 Product Function............................................................................................................................................. 19
6.2 Products Structure and Installation ................................................................................................................. 19
6.3 Operation and Notice ...................................................................................................................................... 21
7. Modbus Communication Protocol......................................................................................................................... 22
7.1 About Protocol ................................................................................................................................................ 22
7.2 Bus Structure................................................................................................................................................... 22
7.3 Abnormal Feedback ........................................................................................................................................ 23

GW/GS32 Series User Manual 1. Products Information
1
1. Products Information
1.1 Motor Soft Starter
Intelligent motor soft starter, the use of intelligent digital control; With the single chip processor as the intelligence
center, thyristor module for actuators for full automatic control motor. It applies various squirrel-cage asynchronous
motor control of load, the motor can smooth starting under any working conditions, protect the drag system, reduce
the starting current impact on power grid, ensure reliable motor starting. Smoothly soft stopping function can
effectively solve the inertial system surge problem, eliminate the drag system of inertial impact, that is traditional
equipment cannot be achieved. Intelligent digital motor soft start equipment system with the complete protection
function, extend the service life of the system, reduce the cost of system cost, improve the reliability of system and
compatible with all the functions of starting equipment; It is a new ideal alternative for traditional star triangle
starter and self-coupling decompression starter.
1.2 Main Function
⚫Effectively reduce the starting current of the motor; Can reduce the distribution capacity, avoid grid expansion
investment.
⚫Reduce the starting stress of motor and load equipment; Prolong the service life of the motor and related
equipment.
⚫Soft stopping function can effectively solve the parking surge problem of inertial systems; That is a traditional
starting equipment cannot be achieved.
⚫With six unique starting mode; To adapt to the complex motor and load, achieve perfect priming effect.
⚫With complete and reliable protection function; effectively protect the safety of motor and related production
equipment.
⚫Intelligent motor soft starter, the application of network technology used motor control technology to adapt to
the rapid development of electric power automation technology in the higher requirements.
Reliable quality
⚫The computer simulation design.
⚫SMT production process.
⚫Good EMC performance.
⚫The machine before delivery on the high temperature aging, vibration test.
Perfect and reliable system protection function
⚫Protection of no voltage, less voltage and over voltage.
⚫Protection of overheating and starting time too long.
⚫Protection of Input phase lost, output phase lost and 3phase unbalance.
⚫Protection of starting over current, running overload, and load short circuit protection.
Maintenance function
⚫Fault self-diagnosis (short circuit, over voltage, less voltage, one phase grounded, motor overload, one phase
lost, motor blocked, and intelligent software can inspect drag system working state).
⚫Combination of modular design, according to the fault display content, quick troubleshooting.
Independent intellectual property products
⚫Independently software copyright.
⚫Motor starting and protection proprietary technology.

1. Products Information GW/GS32 Series User Manual
2
⚫Unique way to detect debug equipment and process.
Quick and thoughtful after-sales service
⚫Reliable performances lay the foundation of qualified service and quality.
⚫Provide perfect system solution.
⚫The timely and thoughtful Consulting Services.
⚫Constantly improve the product performance according to user's opinion.
1.3 Technical Specification
Item
Description
Input Power
Supply
Input Voltage
Three-phase 380V/480V/660AC
Frequency
50/60Hz
Adaptive Motor
Squirrel-cage three-phase asynchronous motor
Starting Times
It is recommended not to exceed 10 times per hour.
Control Mode
(1) Operation panel control.
(2) Operation panel + external control.
(3) External control.
(4) External control + COM control.
(5) Operation panel + external + COM control.
(6) Operation panel + COM control.
(7) COM control.
(8) No start or stop operation.
Start Mode
(1) Current-limiting to start.
(2) Voltage ramp to start.
(3) Torque control + current-limiting to start.
(4) Torque control + voltage ramp to start.
(5) Current ramp to start.
(6) Voltage current-limiting double closed-loop start.
Stop Mode
(1) Soft stop.
(2) Free stop.
Protective Function
(1) Open loop protection for external instantaneous stop terminals.
(2) Over-heat protection for soft starter.
(3) Protection for too long starting time.
(4) Input open phase protection.
(5) Output open phase protection.
(6) Unbalanced three-phase protection.
(7) starting over current protection.
(8) Running overload protection.
(9) Under voltage protection for power voltage.
(10) Overvoltage protection for power voltage.
(11) Protection for fault parameter setting.
(12) Load short circuit protection.
(13) Auto restart or incorrect wiring protection.
(14) Incorrect wiring protection of external control stop terminals.
Ambient
Place to be used
Indoor location with good ventilation free from corrosive gas and conductive dust.
Altitude
Below 1000M. It has to rise the rate power when the altitude is more than 1000M.
Temperature
-20 +45 oC
Humidity
90%RH without dew condensation.
Vibration
<0.5G
Structure
Protection Class
IP20
Cooling Pattern
Fans cooling.

GW/GS32 Series User Manual 2. Products Explanation and Installation
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2. Products Explanation and Installation
2.1 Model Explanation
EMHEATER
GW Series online soft starter
Rated voltage：
2: Three phase 220V
3: Three phase 380V
4: Three phase480V
6: Three phase 660V
Matched motor: 075:75kW; 160:160kW
Diagram 2.1 Products model explanation
2.2 Installation Environment
●Power Supply: City grid power, self-provided power, diesel oil dynamotor, 3-phase alternating current
380V/480V/660V±1 5%, 50Hz or 60Hz. The power capacity of the soft start must meet the motor starting
requirement.
●Matched Motor: Motor should be three phase squirrel asynchronous motor, and its power capacity must be
matched with soft starters.
●Starting Frequency: The starting time is according to the loading equipment.
●Cooling Mode: Naturally wind cooling.
●Protective Grade: IP20
●Environment Conditions: when altitude is less than 1000m, the temperature of the environment should be
between -20oC ~ 45 oC, relative humidity should be less than 90% RH, no vapor, no flammable, volatile,
corrosive gas. No electric dirt, indoor installation, ventilated, vibration is less 0.5G.
2.3 Installation requirement
The direction and distance of installation: In order to make sure that the soft starter be in good ventilation and heat
dissipation, please install the product in vertical direction, and be sure the space around the product is enough. If
the soft starter is installed in a box, please note that the ventilation is very good, as well as the above notes. (See the
following diagram 2.2)

2. Products Explanation and Installation GW/GS32 Series User Manual
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Diagram 2.2 Ventilating duct installation dimension diagram of soft starter
2.4 Products Appearance and Installation Dimension
Diagram 2.3 11KW~45KW installation dimension and mounting holes
Model
Power
Current
External
Dimensions (mm)
Installation Dimensions
(mm)
(KW)
(A)
H
W
D
H1
W1
d
EM-GW3-011
11
23
315
145
221
298
85
M6
EM-GW3-015
15
30
EM-GW3-018
18.5
37
EM-GW3-022
22
45
EM-GW3-030
30
60
EM-GW3-037
37
75
EM-GW3-045
45
90
EM-GW3-055
55
110
EM-GW3-075
75
150
360
210
261
343
150
M8

GW/GS32 Series User Manual 2. Products Explanation and Installation
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EM-GW3-090
90
180
EM-GW3-115
115
230
EM-GW3-132
132
260
465
330
261
440
260
M8
EM-GW3-160
160
320
EM-GW3-200
200
400
562
490
301
535
335
M8
EM-GW3-250
250
500
EM-GW3-280
280
560
EM-GW3-315
315
630
EM-GW3-355
355
710
EM-GW3-400
400
800
840
680
426
780
350
M10
EM-GW3-450
450
900
EM-GW3-500
500
1000
EM-GW3-600
600
1200
Note：The rated power of motor in the above form is the maximum rated value. Generally, the values of
matched motor power capacity should not be more than this value.
2.5 Peripheral Devices Connection Diagram
Main circuit connection: It contains the wiring of 3-phase source input, the output to motor.
Diagram 2.5 GW soft starter peripheral devices connection

2. Products Explanation and Installation GW/GS32 Series User Manual
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2.6 Control Circuit Terminal Description
Control terminal connection: That is the wire comes from 12 external terminals which including input and output
control signal and analogue output or RS485 communication signal.
Diagram 2.6 Control circuit terminal
No.
Terminal Name
Description
Running output
They are normal open contacts and are closed when finishing starting.
The terminal contact capacity is AC 250V/5A.
Programmable
relay output
The delay time is set by FE code. The output command type is set by FE code.
They are normal open no-power terminals, being close when output valid.
Please see the detailed information in item 3.2.1.
This terminal contact capacity is AC250V/5A.
Fault output
They will be closed when there are any fault matters happened to the soft
starter or electricity lost, while at normal case they are open.
This terminal contact Capacity is AC250V/0.5A.
Instantaneous stop
input
This terminal must be connected with terminal ⑩when the starter works
normally. But if these two terminals are open, the soft starter will stop, and at
this time the starter is at the state of fault protection. This terminal ⑦can be
controlled by the normally closed output terminals of external protection
device.
Note: it is useless when the FA code is set to 0 (Primary protection).
External start up
or Stop input
There are two ways of connections for your selection; those are 3-wire
connection and 2-wire connection, as below:
DC 4~20mA
analog output /
485
communication
output
This terminal can switch the output function through the control board jumper,
as following table:
DC 4~20mA
output
They indicate the current value of motor at real-time
working. The 20mA is full-scale value and that is four
times than rated current of nominal power of soft starter,
while, we can connect a 4 ~ 20mA DC current meter to
check. The max value of output load resistance is 300Ω.
485
communication
(Optional)
485+/485-communication interface terminal, input and
output signal terminal for MODBUS-RTU
communication protocol.
Note: 4~20mA and 485 communication can not exist at
the same time, only one of them can be used.
Note：Please make sure that external terminals are in right connection; otherwise, the product may be damaged.

GW/GS32 Series User Manual 3. Operation and Display
7
3. Operation and Display
The motor soft starter has five kinds of working state; Ready, Run, Error, Starting and Stopping, the showing
parameter is easy to understand and modify.
3.1 Key Panel and Operation
No.
Name
Description
LCD display area
LCD display can display the parameter, monitoring data and Error codes.
Operation key
area
Running key: Start the soft starter in the keypad control mode.
STOP/RESET key: Stop operation when it is in the running state and
perform the reset operation when it is in the error state.
SET key: Parameter enter and return.
Confirmation key: confirm the parameter setting.
UP key: Increase data or function code.
DOWN key: Decrease data or function code.
Start and stop operation:
The soft starter shows “READY STATE” after power on, press running key to start motor. In the process of
starting, the key panel shows “Motor: xxxA STARTING”; When the starting is completed, the key panel shows
“Motor: xxxA RUNNING”, at this time, can be press UP key, DOWN key to select the prompt
information. And press STOP/RESET key to stop motor.

3. Operation and Display GW/GS32 Series User Manual
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Prompt:
●Only when the "READY STATE" is displayed, the motor can be started by pressing the running key.
●During the start and stop process, you can not enter the Set Menu or Help Menu.
●When the value of overload is more than 100%, the screen shows Error 08, that means soft starter is at state of
over-load protection.
Parameter modification operation:
Under non-Set State, press the set key to enter Set Menu” and shows “F0: 30% VOLTAGE”. You can press
UP key or DOWN key to select the function code.And press set key again to enter the parameter that
needs to be modified.At this time, the colon is flashing, press confirmation key, If the screen shows "GOOD
PROGRAM" and beeps twice, it means that the new data has been saved, then exit and return to "READY STATE".
If you do not want to save, please press the set key until the colon stops flashing, then the parameters recover.
Having finished the above operation, please press the confirmation key to exit or press key to exit
directly.
Prompt:
●There will be a sound prompt when the key operation is valid, otherwise the key is not valid.
Checking help information:
When the product is not starting or stopping state, and not at the ”set” state, you can press confirmation key
and come into helping menu, then press the or key to choose the help message. Please press or
key to return.

GW/GS32 Series User Manual 3. Operation and Display
9
Message displayed
Explanation
AC: xxxxV
VOLTAGE
XXXX is 3 phase power voltage,
030A-380V
SPEC
That is the specification is AC 30A-380V/50Hz.
H1: Error 01
7-10 OPEN
The fault message Err01 that happened at the last time.
......
......
H9: Error 00
NO ALARM
It means no fault happened.
Ver 3.0
Version Number
It means the software of the products is Ver3.0.
L XXXX
Number of starts
XXXX is number of times of successful starting.
T-run xxS
Last time
XX is last soft starting time.
Note: The message H1 ~ H9 displayed means 9 faults records that happened lately.
3.2 Description of Function Codes
The explanation for function codes as below:
F0
Initial Voltage
Setting range
30-70%
Default
30%
This code can be used when the starting mode is set as "Voltage ramp to start", and if the
motor load is heavy, please set F0=40%, or higher a little. Under "Limit-current" mode,
the F0 value will be fixed as 40%.
F1
Start Time
Setting range
2-60s
Default
16s
It is used to set longest soft starting process time, and soft starting time maybe shorter for
different load. It is invalid under "Limit-Current" starting mode.
F2
Stop Time
Setting range
0-60s
Default
0s
If the code set as "0", the motor will free stop. One soft starter for 2 motor, this code
should set "0".
F3
Interval Time
Setting range
0-999s
Default
0s
Delay is with countdown mode; If set as "0", the starter will start up the motor
immediately.
*F4
Program Delay
Setting range
0-999s
Default
0s
This code is used to set delay time of ③&④terminals output.
Set "0" immediately close. (Please refer to FE for details)
F5
Current Limit
Setting range
50~500%
Default
400%
It is used when the staring mode is "current limit", and the value will be fixed as 400%
when the starting mode is "Voltage ramp to start"
*F6
Maximum Current
Setting range
50~200%
Default
100%
The "50 ~ 200%" is basic on the nominal current of motor. If the set value of this code
over 200%, the soft starter will reverse to overheat protection.
F7
Low Voltage
Setting range
40~90%
Default
80%
When the working voltage is under the voltage range (80%), the soft starter will be low
voltage protection
F8
Over Voltage
Setting range
100~130%
Default
120%
When the working voltage is over the voltage range (120%), the soft starter will be over
voltage protection

3. Operation and Display GW/GS32 Series User Manual
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F9
Start Mode
Setting range
0~5
Default
1
0: Current limit
1: Voltage ramp
2: Torque control + Current limit
3: Torque control + Voltage ramp
4: Current ramp
5: Closed loop
FA
Protection Level
Setting range
0~4
Default
1
0. Primary
1. Light-load
2. Standard
3. Heavy-load
4. Top Grade
FB
Control Mode
Setting range
0~7
Default
1
0: Keypad
1: Keypad + Terminal
2: Terminal
3: Terminal + Communication
4: Keypad + Terminal + Communication
5: Keypad + Communication
6: Communication
FC
Parameter
Selection
Setting range
0~2
Default
1
0: Read Only; (It is prohibited to revise the parameter except FC)
1: Read &Partial Write; (It is prohibited to revise the parameter with “*”)
2: Read &All Write.
*FD
Communication
address
Setting range
0~63
Default
0
Many soft starters connect with upper computer.
*FE
Program Output
Setting range
0~19
Default
6
Setting the detailed in Item 5.3
*FF
Stop Current Limit
Setting range
20~100%
Default
80%
Setting the detailed in Item 7.3
FP
Motor Rated
Current
Setting range
---
Default
Rated value
"The rated current of motor" is the same as the motor nominal current. If your motor rated
power is much lower than soft starter, please revise the FP same as motor rated current.
And then soft starter can protect small KW motor. If you meet Error 05, please change
FA=2.
*FU
Bypass Time
Setting range
0~99s
Default
5s
This parameter can delay soft starter switching to bypass contactor time. If soft starter
starts very heavy fan or pump, please set the parameter to 10 or 15 seconds.
*FL
Current Unbalance
Setting range
0~1
Default
1
0: Prohibited
1: Allowed
*FM
Current Calibration
Setting range
50~150%
Default
100%
Showing current slants high, to set coefficient down; Lower conversely
*FN
Voltage Calibration
Setting range
50~150%
Default
100%
Showing voltage slants high, to set coefficient down; lower conversely
FO
Language
Setting range
0-2
Default
1
0: Chinese
1: English

GW/GS32 Series User Manual 3. Operation and Display
11
2: Russian
Prompt:
⚫F6 the " Max Current ", is basic on the value of FP (Motor Rated Current).
⚫If you have no any operation for 2 minutes after you come into the "set" state, soft starter will exit from "set"
state.
⚫You can not set any parameters in the process of starting or stopping.
⚫If you press the conformation key to power on soft starter, all parameters will recover to default setting
except FE code.
3.2.1 Programmable Relay Output Function
The programmable relay output function has two working modes: programmable timing output and programmable
state output.
When the FE is setting to 0~4(10~14), the terminal ③&④work in programmable timing output, as the
following form :
FE setting value
Programmable timing output
0(10)
When sending the order of starting, the program output
1(11)
When beginning to start, the program output
2(12)
When at the start of bypass operation, the program output
3(13)
When sending the order of stopping, the program output
4(14)
When finishing the operation of stopping, the program output
⚫This working mode includes a 999 second timer, which is set by the parameter F4.
If F4 setting is not 0, it will be starting timing according to the value of parameter FE, the output state will
change when the time is up.
If F4 setting is 0, it will change state immediately.
⚫When FE setting is 10~14, the programmable output will be “reverse phase output”, (Normal open will reverse
to normal close).
When the FE is setting to 5~9(15-19), the terminal ③&④work in programmable state output, as the following
form :
FE setting value
Programmable state output
5(15)
Fault state
6(16)
Working state
7(17)
Ready state
8(18)
Starting state
9(19)
By-pass operation state
⚫When the FE setting is 5, the terminal ③&④can output error such as: Error05, Error06, Error07, Error08,
Error12, Error14, this will not affect the function of ⑤⑥ error output terminals.
⚫When FE=5~9(15~19), under this way, the F4 setting delay time is invalid.
⚫When FE setting is 15~19, the programmable output will be “reverse phase output”, (Normal open will
reverse to normal close).
3.2.2 Other Parameter Description
The parameter FB is used to set the control ways of soft starter; as the following form:
Numerical value
0
1
2
3
4
5
6
7

3. Operation and Display GW/GS32 Series User Manual
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Keypad
1
1
0
0
1
1
0
0
External terminal control
0
1
1
1
1
0
0
0
RS485 Communication
0
0
0
1
1
1
1
0
⚫In the above form,"1" is allowing,"0" is forbidding. For example.
⚫If the "External terminal Control" is allowing, you must contact a normally closed switch button between the
terminal ⑦⑧ and ⑩, otherwise the soft starter can’t start-up the motor and show "Error 01/ Error 16".
3.3 Fault Diagnosis and Solution
The fault codes and handling methods are as follows:
Fault Type
Description
Possible causes and solutions
Error00
No Errror
Any faults are removed, such as low-voltage, over-voltage, over-heat. Now
the Ready-lamp is lighting and you can start the motor.
Error01
7,10 Term. Open
Please connect the external instantaneous stop terminal (terminal ⑦) and
stop terminal 8 with the public terminal (terminal ⑩) together.
Error02
Over Heat
The soft starter is started too frequently, or the soft starter rated current is
smaller than motor, or motor is heavy over load.
Error03
Excess Start Time
The starter parameter is set wrong; or the motor load is heavy, or voltage
transformer capacity is not enough; or power supply cable is too long. If soft
starter capacity is enough and load is heavy fan or pump, please set FU to 10
or 15 second.
Error04
Input phase loss
Please check whether the input circuit connections, bypass contactor and the
controlled silicon is open or whether the thyristor wire is not connected.
Error05
Output phase loss
Please check whether the output circuit connection, bypass contactor and the
controlled silicon are short circuit, or whether the thyristor wire is connected
well; The power supply should connect to R,S,T, and bypass contactor
should connect with L1,L2,L3; If motor KW is much smaller than soft
starter, please set parameter FA=2.
Error06
Current Unbalance
Please check the input three-phase power voltage is balance or not, and
check the motor 3phase is abnormal. Or set parameter FC=2 and E1=0.
Error07
Over Current
Overload, or the motor is not matched with the soft starter.
Error08
Over Load
Overload or the F6, FP code is set wrong.
Error09
Low Voltage
Please check the voltage of input power or the F7 item is set wrong.
Error10
Over Voltage
Please check the voltage of input power or the F8 item is set wrong.
Error11
Paramter Error
Please change the parameter correctly, or you can press the Confirmation
key to power on the starter again to recovery the default setting.
Error12
Load short circuit
Check load and the controlled silicon is short circuit or overload.
Error13
Line Fault
The external terminals are not connected according the 2-wire way.
Error14
8,10 Term. Open
Please check and connect⑧,⑩.
Error15
Motor Underload
Please match the appropriate motor.
Note: When the motor starts successfully, ①and ②will close to suck by pass contactor running. At this time,
if the contactor is not closed, the motor will stop running, so you can check whether the wiring of the bypass
contactor is right.

GW/GS32 Series User Manual 4. Protection Functions and Directions
13
4. Protection Functions and Directions
We make our soft starters have all kinds of protection functions to protect the safety of soft starter and the motor.
Please choose the correct protection Class and parameters according to your application conditions!
4.1 Protection Function
●Over-heat protection: When soft starter inside temperature is up to 80oC ± 5oC, the starter will turn to
over-heat protection, when be down to 55oC, this protection removes.
●Input phase loss protection: The delayed time < 3s
●Output phase loss protection: The delayed time < 3s
●Current unbalance protection: The delayed time < 3s, when the difference of current among three phrases is
more than 50% ±10%, the protection be valid.
●Over current protection time: The diagram of over current 5 times of F6 set rated working current is just as
diagram 4.1.
●Over load protection time: The starter will be in inverse time thermal protection on. Base of the Max current
of motor (Set by F6), (The diagram 4.1 show)
●Low voltage protection: When power voltage is less than 40%, the protection delayed time < 0.5s; When
power voltage is less than 80%, the protection delayed time < 3S.
●Over voltage protection: When power voltage is more than 140%, the protection delayed time < 0.5S; When
power voltage is more than 120%, the protection delayed time < 3S.
●Load short circuit protection delay time: The protection delayed time < 0.1S.
4.2 Protection Classes and Explanation
According different usage conditions, EM-GW series Soft Starter has five protection classes, as following:
0. Primary
1. Light load
2. Standard
3. Heavy load
4. Top grade
⚫Primary protection includes the protection functions of overheat, short circuit, and input default phase protection
and prohibit external instantaneous stop terminal. Which are proper urgently startup conditions, such as fire
pump.
⚫Light load, standard and heavy load protection have the overall protection function of soft starter. The
difference among them is protection level of overload and over current. See the diagram of 4.1.
⚫The protection classes and the time of heat protection as (diagram 4.1)

4. Protection Functions and Directions GW/GS32 Series User Manual
14
FA
0:Primary
1:Light Load
2:Standard
3:Heavy load
4:Top Grade
Note
The grade of
overload
protection
No
2 grades
10 grades
20 grades
10 grades
Standard of
IEC60947-4-2
The grade of
over-current
protection
No
3s
15s
30s
15s
The 5 times of
F6 current
Overload
drop-away time
The multiple to
the current
3
4
5
3
4
5
3
4
5
3
4
5
They are the
typical values
Drop-away
time (S)
4.5
2.2
1.5
23
12
7.5
46
23
15
23
12
7.5
Remark: FP set value should be same as motor nameplate rated current. The FP set value should not be less
than 20% of soft starter rated current, otherwise the overheat protection will be useless because of big tolerance.
Diagram 4.1(IEC60947-4-2 standard) Motor heat protection curve (overload drop-away time)

GW/GS32 Series User Manual 5. Test Run and Application
15
5. Test Run and Application
Please do some examinations before test running as following:
⚫Whether the rated power of soft starter is matched with the Motor.
⚫Whether the insulation of motor meets requirement.
⚫Whether the main circuit connection of input and output is correct.
⚫Whether all the screws of terminals are twisted tightly.
5.1 Power on to Test Running
⚫After Power on, please do not disassemble the soft starter cover that is dangerous!
⚫Power on, soft starter displays “READY”, and the Ready is light, then you can press running key to start.
⚫Set FP be same as motor nameplate rated current.
⚫After started the motor, you should examine whether the motor running direction is correct, or whether runs
normally. If not, you can press key or cut off the power to stop running.
⚫If the soft starter starting state is not satisfied. Please see the detailed explanation at chapter 5.5: the starting
mode and application
⚫If the start torque is not enough, you can change the starting voltage (when the starting mode is voltage control)
or the certain current value (when the mode is current control) to improve start torque.
⚫Do not open the face cover in case of electric shock.
⚫If there is any abnormal voice, smoke or taste, please cut off power as soon as fast, and check the reason.
⚫When the starter power on or be in starting, the error lamp is lighting and screen displays "Error xx", at this time,
you can check chapter 3.5 to find out reason.
⚫Press key or external stop button can reset the error state.
Note: When ambient temperature is less than -10oC, the starter should be power on to preheat for 30 minutes,
and then to start.
5.2 Starting Mode and Application
The EM-GW series soft starter has six starting modes for the user to select according the motor and load
equipment.
5.2.1 Current limit
(F9=0) Diagram 5.1 shows the waveform of motor current. I1 is the starting limit-current preset value. When
starting, the output voltage rises quickly till the motor current up to I1 value and not beyond this value. The motor
runs steadily in pace with the rising of output voltage, and when the motor runs to be the rated speed, the output
current will have a quick-drop and down to the motor rated current (Ie value),then the bypass contactor is working,
the stating process finished.
Note: When motor load is too light or I1 preset value is too high, the max current of starting may can not reach I1
value. This starting mode fits for the conditions which requires strict current limit of starting.

5. Test Run and Application GW/GS32 Series User Manual
16
Diagram 5.1
5.2.2 Voltage Ramp
(F9=1) Diagram 5.2 shows the output voltage waveform. In the diagram, the U1 is the initial voltage value of
starting. When starting, if the motor current is not more 400% than the rated current, the output voltage of soft
starter will rapidly rise to U1, and the output voltage rises gradually to the rated voltage (Ue), and the motor
gradually increase and until running at rated voltage and speed, and then the bypass contactor closed, the starting
process finished.
Starting time "T" is obtained in the standard experiment under the condition of soft starter with standard load. And
soft starter takes this control parameters as a benchmark, smooth acceleration by controlling the output voltage to
motor starting process to complete, not mechanically controlled time "T" and regardless smooth of whether the
motor speed. In view of this, when the load is lighter, starting time are often less than the set starting time, as long
as can smooth starter is normal
In general, the voltage ramp is generally used mode; it is suitable for requiring higher starting stability without strictly
current limitation case.
Note:"T" is the automatic detecting starting time according to load. It will be less than set time when the load
equipment is light; this starting mode fits for the common occasions where the motor needs to be started smoothly.
Diagram 5.2
5.2.3 Torque control + Current limit/Voltage ramp
(F9=2 or 3) Diagram 5.3 and 5.4 shows the output changing waveform of torque control starting mode. When the
static friction force of heavy load is too stronger to start the motor, user can use this starting mode. At first state of

GW/GS32 Series User Manual 5. Test Run and Application
17
starting, the motor needs a higher voltage to conquer the static friction force of heavy load, and then starts with
current-limit or voltage ramp mode to start the heavy motor.
Note: This mode will cause big-current shock to the motor, so if the voltage ramp or current limit starting mode can
startup the motor, it is better not to use this torque control mode to start.
Diagram 5.3 Diagram 5.4
5.2.4 Current ramp
(F9=4) Diagram 5.5 shows the output current waveform. The I1 in the diagram is current value preset by F5 code,
and T1 is time value present by F1 code. This starting mode has very stronger speed-up ability and is suit for the
bipolar motors, and it can reduce the starting time.
Diagram 5.5
5.2.5 Closed loop
(Both voltage ramp and current limit) to start (F9=5). This starting mode uses voltage ramp and current limit
double closed loop circuit; it is a composite starting mode. The output voltage waveform is changed as different
motor and the load equipment. This mode fits for smooth starting and strictly current limit occasions.
5.3 Stopping mode and Application
The soft starter has two stopping modes; those are Soft-stopping mode and Free-stopping mode.
5.3.1 Soft-stopping Mode
(The F2 item is not set as"0") When using this mode to stop the motor, the power supply of motor will be
transferred from the bypass contactor to the controlled silicon of soft starter, and the output voltage of starter will
be reduced gradually so that the running speed of motor can be cut down smoothly avoid mechanical shock. The