JACT AT550 Series User manual

AT550 Series Inverter Manual
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Preface
Thank you for choosing the AT550 series of AC Drives developed by JACT Electric
Co., Ltd. JACT designs and manufactures the AT550 Series of AC Drives for the
industrial automation applications and focus on product quality improvement by
launching the policy of continuous product development and gradual improvement.
The AT550 is a high-performance and multipurpose industrial product aiming to
integrate synchronous motor drive with asynchronous motor drive, and torque
control, speed control with position control. It is designed with advanced vector
control technology and the latest digital processor dedicated for motor control, thus
enhancing product reliability and adaptability to the environment.
The AT550 adopts customized and industrialized design to realize excellent control
performance through optimized functions and flexible applications.
AT550 uses high power density design. Some power ranges carry built-in DC reactor
and brake unit to save installation space. Through overall EMC design, it can satisfy
the low noise and low electromagnetic interference requirements to cope with
challenging grid, temperature, humidity and dust conditions, thus greatly improving
product reliability.
This operation manual presents installation wiring, parameter setup, fault diagnosis
and trouble shooting, and precautions related to daily maintenance. Read through
this manual carefully before installation to ensure the AC Drive is installed and
operated in a proper manner to give full play to its excellent performance and
powerful functions.
It is the responsibility of the user or machine builder or installation contractor or
electrical designer/engineer to take all necessary precautions to ensure that the
system complies with current standards, and to provide any devices (including safety
components), required to ensure the overall safety of the equipment and personnel.
If there is any doubt with regards to the software version or the manual contents,
please contact us.

Safety Instructions AT550 Series Inverter Manual
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Safety Information and Precautions
Safety definition
DANGER
It is essential for avoiding a safety hazard. Serious physical injury or even death may occur if
related requirements are not followed.
WARNING
It is necessary for avoiding a risk of damage to the product or other machine.
WARNING
As high voltage still presents in the bus capacitor after power off, wait for at least five minutes
(or 15 min / 25 min, depending on the warning symbols on the machine) after power off to prevent
electric shock.
Electrical Safety
Extreme care must be taken at all times when working with the AC Drive or within the area of the AC
Drive. The voltages used in the AC Drive can cause severe electrical shock or burns and is potentially
lethal. Only professional and qualified personnel should be allowed to work on AC Drives.Read the
operation manual before operating on the equipment.
The guidelines and recommendations should be followed in order to gain long term trouble free operation
as the lifetime of the AC Drive is dependent on the working environment and correct handling of the
product in the initial installation stage.
Delivery and installation
Select appropriate tools for delivery and installation to ensure a safe and proper running of the
AC Drive and avoid physical injury or death. To ensure physical safety, the installation staff should take
mechanical protective measures, wearing exposure shoes and working uniforms;
R, S and T are the power input terminals, and U, V and W are output motor terminals. Connect
the input power cables and motor cables properly; otherwise, damage to the AC Drive may occur.
Connect the optional brake parts (brake resistors, brake units or feedback units) according to the wiring
diagram.Do not touch the AC Drive with wet items or body parts; otherwise, electric shock may occur.
When using an earth leakage circuit breaker, use a residual current operated protective device (RCD) of
type B (breaker which can detect both AC and DC). Leakage current can cause unprotected components to
operate incorrectly. If this is a problem, lower the carrier frequency, replace the components in question
with parts protected against harmonic current, or increase the sensitivity amperage of the leakage breaker
to at least 200 mA per drive.

AT550 Series Inverter Manual Safety Instructions
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Adjusting AC Drive Parameters
Disconnect all power sources applied to the AC Drive before terminal wiring, and wait for at least the time
designated on the AC Drive after disconnecting the power sources.
High voltage presents inside the AC Drive during running. Do not carry out any operation on the AC Drive
during running except for keypad setup.
This manual provides a complete list of the parameters with functional description and care should always
be taken whenever parameters are adjusted during a live running startup. JACT can provide product
training and if in doubt seek advice.
Maintenance and component replacement
Only well-trained and qualified professionals are allowed to perform maintenance, inspection, and
component replacement on the AC Drive.
Take measures to prevent screws, cables and other conductive matters from falling into the AC Drive
during maintenance and component replacement.
Do not perform wiring, inspection or component replacement when power supply is applied. Ensure all the
input power supplies are disconnected before wiring and inspection, and wait for at least the time
designated on the AC Drive or until the DC bus voltage is less than 36V. The minimum waiting time is
listed in the table below.
AC Drive Model
Minimum waiting time
0.75kW-110kW
5min
132kW-315kW
15min
Above 355kW
25min

Contents AT550 Series Inverter Manual
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Contents
Preface.............................................................................................................................................................- 1 -
Safety Information and Precautions................................................................................................................- 2 -
Contents.......................................................................................................................................................... - 4 -
Chapter 1 Product Information....................................................................................................................... - 5 -
1.1 Product Type Identification............................................................................................................ - 5 -
1.2 Product Nameplate......................................................................................................................... - 5 -
1.3 AT550 Inverter Series..................................................................................................................... - 6 -
1.4 Product Description........................................................................................................................ - 7 -
1.6 Product Appearance and Dimensions........................................................................................... - 10 -
1.7 Keyboard Appearance and Dimensions........................................................................................- 13 -
1.8 Appearance and Hole Size of the Keyboard Tray.........................................................................- 13 -
1.9 Appearance and Dimensions of the Double Display Keyboard and Tray.................................... - 14 -
Chapter 2 Mechanical Installation................................................................................................................ - 15 -
2.1 Installation Environment.............................................................................................................. - 15 -
2.2 Installation Space and Directions................................................................................................. - 15 -
2.3 Dismantling of the Cover Plate.................................................................................................... - 17 -
Chapter 3 Electrical Installation....................................................................................................................- 18 -
3.1 Electrical Installation....................................................................................................................- 18 -
3.2 Description of Peripheral Electrical Devices................................................................................- 19 -
3.3 Peripheral Electrical Components Selection Guidance................................................................ - 20 -
3.4 Selection of Braking Unit and Braking Resistor.......................................................................... - 20 -
3.5 Selection of Expansion Card........................................................................................................ - 22 -
3.6 Wiring Method..............................................................................................................................- 23 -
Chapter 4 Keyboard and Display.................................................................................................................. - 36 -
4.1 Operation and Display Interface...................................................................................................- 36 -
4.2 Keyboard Indicators Description..................................................................................................- 37 -
4.3 Keyboard Button Description.......................................................................................................- 37 -
4.4 Viewing and Modifying Function Codes......................................................................................- 37 -
4.5 Selecting Menu Mode...................................................................................................................- 38 -
Chapter 5 Basic Operation and Test Run...................................................................................................... - 39 -
5.1 Quick Adjustment Guidance.........................................................................................................- 39 -
5.2 Precautions Before Power-On...................................................................................................... - 40 -
5.3 Display Status After Power-On.................................................................................................... - 40 -
5.4 Motor Control Methods Selection................................................................................................ - 40 -
5.5 Initialization of Parameters...........................................................................................................- 42 -
5.6 Operation Commands Source Selection....................................................................................... - 42 -
5.7 Frequency Source Selection......................................................................................................... - 43 -
5.8 Stop Modes Selection................................................................................................................... - 45 -
5.9 Observation of Operation Status via DO and AO.........................................................................- 45 -
Chapter 6 Function Parameter List............................................................................................................... - 46 -
Chapter 7 Function Parameter List............................................................................................................... - 75 -
Chapter 8 Maintenance and Troubleshooting............................................................................................... - 97 -
8.1 Daily Maintenance and Inspection of AT550............................................................................. - 122 -
8.2 Warranty..................................................................................................................................... - 123 -
8.3 Faults and Solutions................................................................................................................... - 123 -
Appendix A: MODBUS Communication Protocol.....................................................................................- 129 -
1.1 Protocol Contents....................................................................................................................... - 129 -
1.2 Communication Frame Description............................................................................................- 129 -
1.3 Communication Data Address Definition...................................................................................- 132 -
1.4 Description of Group FD Communication Parameters.............................................................. - 134 -

AT550 Series Inverter Manual Chapter 2 Mechanical Installation
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Chapter 1 Product Information
1.1 Product Type Identification
AT550 - T3 - 011G / 015 P B
AT550 series AC Drive
Mark
Voltage Class
T3
Three-phase 380V
S2
Single-phase 220V
G：General type
P：Special type
Mark
With Built-in Braking Unit
B
Yes
Blank
No
This is an example of the nameplate of standard AT550 products.
Figure 1.1 Product Model Name
1.2 Product Nameplate
MODEL: AT550-T3-011G/015PB
INPUT: 3PH AC 380V 26A 50Hz/60Hz
OUTPUT1: 3PH AC 0~380V 25A 0~300Hz
OUTPUT2: 3PH AC 0~380V 32A 0~300Hz
SN: 10174100209000002
Wuxi JACT Electric Co.,LTD
Model
Rated input
Rated output1
Rated output2
Series NO.
Manufacturer
Nameplate
Figure 1.2 Product type identification
Note:
Built-in brake unit is included in standard configuration of 380V 22kW and below models;Brake unit is not
included in standard configuration of 380V 30kW and 37kW models (optional built-in brake unit is available,
suffix "-B" indicates optional built-in brake unit).

Chapter 2 Mechanical Installation AT550 Series Inverter Manual
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1.3 AT550 Inverter Series
Product Model
Input current (A)
Output current (A)
Motor (kW)
AT550-S2-0R4GB
5.4
2.3
0.4
AT550-S2-0R7GB
8.2
4
0.75
AT550-S2-1R5GB
14
7
1.5
AT550-S2-2R2GB
23
9.6
2.2
Product Model
Input current (A)
Output current (A)
Motor (kW)
AT550-T3-0R7G/1R5PB
3.4
2.1
0.75
AT550-T3-1R5G/2R2PB
5
3.8
1.5
AT550-T3-2R2G/4R0PB
5.8
5.1
2.2
AT550-T3-4R0G/5R5PB
10.5
9
3.7
AT550-T3-5R5G/7R5PB
14.6
13
5.5
AT550-T3-7R5G/011PB
20.5
17
7.5
AT550-T3-011G/015PB
26
25
11
AT550-T3-015G/018PB
35
32
15
AT550-T3-018G/022PB
38.5
37
18.5
AT550-T3-022G/030PB
46.5
45
22
AT550-T3-030G/037P
62
60
30
AT550-T3-037G/045P
76
75
37
AT550-T3-045G/055P
92
91
45
AT550-T3-055G/075P
113
112
55
AT550-T3-075G/090P
157
150
75
AT550-T3-090G/110P
180
176
90
AT550-T3-110G/132P
214
210
110
AT550-T3-132G/160P
256
253
132
AT550-T3-160G/185P
307
304
160
AT550-T3-200G/220P
385
377
200
AT550-T3-220G/250P
430
426
220
AT550-T3-250G/280P
468
465
250
AT550-T3-280G/315P
525
520
280
AT550-T3-315G/355P
590
585
315
AT550-T3-355G/400P
665
650
355
AT550-T3-400G/450P
785
725
400
AT550-T3-450G
883
820
450
AT550-T3-500G
910
900
500
AT550-T3-560G
1100
1020
560
AT550-T3-630G
1160
1120
630
AT550-T3-710G
1171
1260
710
Table 1.1 AT550 Models and Specs

AT550 Series Inverter Manual Chapter 2 Mechanical Installation
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1.4 Product Description
Figure 1.3 Components of Plastic Case Model
Figure 1.4 Components of the Metallic Case Model
Operation Panel
Company Logo
Control Terminals
Main Circuit
Terminals
Lower Cover
Fan Plate
Fan
Case
Name Plate
Guide Rail Plate
Company Logo
Surface Cover
Fans
Operation Panel
Case
Control Terminals
Main Circuit
Terminals
Name Plate

Chapter 2 Mechanical Installation AT550 Series Inverter Manual
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1.5 Technical Specifications
Table 1.2 Technical Specifications of AT550
Item
Specification
Standard
functions
Maximum frequency
320Hz
Carrier frequency
0.5kHz~16.0kHz
The carrier frequency is automatically adjusted based on the
temperature
Input frequency resolution
Digital setting:0.01Hz
Analog setting:maximum frequency×0.025%
Control mode
Voltage/Frequency(V/F) control
Switching vector control (SVC)
Forward vector control (FVC)
Startup torque
G type: 0.5Hz/150% (SVC); 0Hz/180% (FVC)
P type: 0.5Hz/100%
Speed range
1:100(SVC)
1:1000(FVC)
Speed stability accuracy
±0.5%(SVC)
±0.02%(FVC)
Torque control accuracy
±0.5% (FVC)
Overload capacity
G type: 60s for 150% of rated current and 3s for 180% of
rated current
P type: 60s for 120% of rated current and 3s for 150% of
rated current
Torque boost
Automatic torque boost
Manual torque boost 0.1%~30.0%
V/F curve
Straight-line V/F curve
Multi-point V/F curve
Square V/F curve
Ramp mode
Straight-line ramp
S-curve ramp
Four groups of acceleration/deceleration time with the range
of 0.0–6500.0s
DC braking
DC braking frequency: 0.00Hz to max.frequency
Braking time: 0.0–100.0s
Braking action current value: 0.0%~100.0%
JOG control
JOG frequency range: 0.00–50.00 Hz
JOG acceleration/deceleration time: 0.0–6500.0s
Simple PLC, multiply speed
running
The system implements up to 16 speeds by using simple PLC
function or by using digital input signals.
Onboard PID
It implements the closed-loop process control system easily.
Auto voltage regulation
(AVR)
The system maintains a constant output voltage
automatically when the grid voltage changes through the
permissible range.
Standard
functions
Overvoltage& Overcurrent
stall control
The current and voltage are limited automatically during the
running process so as to avoid frequent tripping due to
overvoltage and overcurrent.
Rapid current limit
It decreases the overcurrent faults to the minimum and
ensures normal running of the AC drive.

AT550 Series Inverter Manual Chapter 2 Mechanical Installation
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Torque limit and control
It can limit the torque automatically and prevent frequent
overcurrent tripping operation.Torque control is applied in
vector control mode.
Individua
- lized
functions
High performance
high-performance current vector control technology.
Power dip ride-through
Load feedback energy compensates for any voltage
reduction, allowing the drive to continue to operate for a
short time during power dips.
Timing control
Time range: 0.0–6500.0 minutes
Field bus
Modbus-RTU protocol (485)
Running
Running command source
• Operation panel control
• Terminal control
• Communication control
Allows different methods of switching between command
sources:
Frequency setting channel
Supports up to 13 frequency reference setting channels and
allows different methods of switching between frequency
reference setting channels:
Digital setting
Analog voltage reference
Analog current reference
Pulse reference
Communication reference
Auxiliary frequency setting
channel
Supports up to 10 auxiliary frequency sources, and
allows fine tuning of the auxiliary frequency and main &
auxiliary calculation.
Input terminals
5 digital input (DI) terminals, X5 supports up to 100 kHz
high-speed pulse input;
2 analog input (AI) terminals, AI1 only supports 0–10 V
voltage input and AI2 supports 0–10 V voltage input or
4–20 mA current input.
Output terminals
1 high-speed pulse output terminal (open-collector) that
supports 0–100 kHz square wave signal output
1 digital output (DO) terminal
2 relay output terminals(One is factory default, the other is
optional)
2 analog output (AO) terminals that supports 0–20 mA
current output or 0–10 V voltage output.
Display &
operate
panel
LED display
Display parameters (three display modes: Basic mode,
Quick menu mode, Non-factory value mode).
Protection function
Phase loss protection; Instantaneous overcurrent
protection; overheat protection;Short-circuit protection;
overvoltage protection; undervoltage protection; overload
protection; overcurrent protection;
Optional parts
Braking unit, I/O and AI extension card, field bus
communication card, differential input PG card, OC input
PG card, sin/cos PG card.

Chapter 2 Mechanical Installation AT550 Series Inverter Manual
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Environ-
ment
Installation location
Indoor, free from direct sunlight, dust, corrosive gas,
combustible gas, oil smoke, vapour, drip or salt.
Altitude
Lower than 1000 m (de-rated if higher than 1000 m)
Ambient temperature
-10°C to +40°C (de-rated if the ambient temperature is
between 40°C and 50°C).
Humidity
Less than 95%RH, without condensing
Vibration
Less than 5.9 m/s2 (0.6 g)
Storage temperature
－20℃~＋60℃
1.6 Product Appearance and Dimensions
W1
W
H
H1
D1
D
Figure 1.5 Plastic Case Mounting Dimensions
W1
W
H1 H
D1
D
Figure 1.6 Metallic Case Mounting Dimensions

AT550 Series Inverter Manual Chapter 2 Mechanical Installation
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Model
Mounting
Holes Position
Dimensions
Diameter of
Mounting
Holes
W1
H1
H
W
D1
D
AT550-S2-0R7GB
71.5
121.5
132
80
105.5
114.6
φ4.5
AT550-S2-1R5GB
AT550-S2-2R2GB
88.4
168.4
180
100
152
159
φ5.5
AT550-T3-0R7G/1R5PB
AT550-T3-1R5G/2R2PB
AT550-T3-2R2G/4R0PB
AT550-T3-4R0G/5R5PB
118.4
224.5
236
130
163.5
170.5
φ5.5
AT550-T3-5R5G/7R5PB
AT550-T3-7R5G/011PB
141
243
260
155
175
182
φ7
AT550-T3-011G/015PB
AT550-T3-015G/018PB
190
273.5
291.5
197
175
182
φ6
AT550-T3-018G/022PB
AT550-T3-022G/030PB
AT550-T3-030G/037P
220
392
405
253
180
187
φ7
AT550-T3-037G/045P
AT550-T3-045G/055P
260
555
575
340
250
259
φ10
AT550-T3-055G/075P
AT550-T3-075G/090P
260
590
610
410
270
279
φ10
AT550-T3-090G/110P
AT550-T3-110G/132P
320
690
720
455
325
334
φ12
AT550-T3-132G/160P
AT550-T3-160G/185P
360
845
880
530
367
376
φ14
AT550-T3-200G/220P
AT550-T3-220G/250P
480
1005
1040
650
411
420
φ14
AT550-T3-250G/280P
AT550-T3-280G/315P
AT550-T3-315G/355P
600
1252
1300
815
427
436
φ14
AT550-T3-355G/400P
AT550-T3-400G/450P
AT550-T3-450G

Chapter 2 Mechanical Installation AT550 Series Inverter Manual
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1.6.2 Cabinet Installation Dimensions
Figure 1.7 Installation Diagram
W1
H1
H
W
LL1
D
Figure 1.8 Cabinet Installation Dimensions
Model
Appearance Dimensions (mm)
Installation
Dimensions
Diameter of
Mounting
Holes
H
W
L
L1
H1
W1
AT550-T3-045G/055P
249
340
850
810
180
280
φ12
AT550-T3-055G/075P
AT550-T3-075G/090P
265
416
880
840
190
350
φ10
AT550-T3-090G/110P
AT550-T3-110G/132P
327
461
980
935
220
380
φ12
AT550-T3-132G/160P
AT550-T3-160G/185P
367
536
1190
1142
290
460
φ12
AT550-T3-200G/220P
AT550-T3-220G/280P
412
656
1400
1354
300
560
φ12
AT550-T3-280G/315P
AT550-T3-315G/400P
428
815
1757
1702
300
730
φ12
AT550-T3-400G/450P
AT550-T3-450G
AT550-T3-500G
600
1150
1900
/
480
1050
φ18
AT550-T3-560G
AT550-T3-630G
600
1310
2208
/
480
1210
φ18
AT550-T3-710G

AT550 Series Inverter Manual Chapter 2 Mechanical Installation
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1.7 Keyboard Appearance and Dimensions
60 14.3
21.3
96
60.5
38.85.5
29.3
Figure 1.9 Appearance and Dimensions of the Keyboard (mm)
1.8 Appearance and Hole Size of the Keyboard Tray
2-R12
键盘托盘尺寸 托盘开孔尺寸
（也可开方孔 115mm*67mm）
121.2
74.2 15.8
115
67
101.9
R12.5
2-R5
Figure 1.10 Keyboard Tray Appearance and Hole Size (mm)

Chapter 2 Mechanical Installation AT550 Series Inverter Manual
- 14 -
1.9 Appearance and Dimensions of the Double Display Keyboard and Tray
60 14.3
21.1
32.777.2
5.2 39.1
116
Figure 1.11 Appearance and Dimensions of the Double Display Keyboard
121.9
2-R5
2-R12
R12.5
66
(135)
托盘开孔尺寸
（也可开方孔129.5mm*66mm）
74.2
141.2
15.8
托盘尺寸
Figure 1.12 Appearance and Dimensions of the Double Display Keyboard and Tray
Dimensions of the Tray
Hole Sizes of the Tray
(Square Hole 129.5mm*66mm)

AT550 Series Inverter Manual Chapter 2 Mechanical Installation
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Chapter 2 Mechanical Installation
2.1 Installation Environment
1. Ambient Temperature: The temperature affects the life of product. It is prohibited to run the product
out of ambient temperature range (-10℃~50℃).
2. Please install the product on flame retardants and mount it vertically on mounting brackets using blots
or screws. Be sure to allow sufficient space around the inverter for heat dissipation since it generates heat
while running.
3. Please install the inverter on a flat surface where the vibration should remain lower than 0.6g, away
from punches, etc.
4. Avoid installing the inverter under direct sunlight or in humid places.
5. Avoid installing the inverter in places of corrosive, flammable and explosive gas.
6. Avoid installing the inverter in places full of oil, dust and metal particles.
2.2 Installation Space and Directions
2.2.1 Single Inverter Installation: the installation and insulation space for an inverter has to be left out
based on its different power ratings.
2.2.2 Multiple Inverters Installation: Inverters dissipate from bottom to top. Therefore, when multiple
inverters are operating, they are usually installed side by side and aligned to top, especially for different
sizes of inverters.
Power level
Size Requirements
0.75kW-22kW
A≥10mm
B≥100mm
C≥40mm
30kW-37kW
A≥50mm
B≥200mm
C≥40mm
45kW-75kW
A≥50mm
B≥200mm
C≥40mm
90kW-710kW
A≥50mm
B≥200mm
C≥40mm
Power level
Size Requirements
0.75kW-22kW
A≥10mm
30kW-37kW
A≥50mm
45kW-75kW
A≥50mm
90kW-710kW
A≥50mm
Power Ratings
0.75KW-22kW
30KW-37kW
Size Requirements
A≥10mm B≥100mm
A≥50mm B≥200mm
A≥50mm B≥200mm
A≥50mm B≥300mm
45KW-75kW
90KW-710kW
Installation Space Requirements
C≥40mm
C≥40mm
C≥40mm
C≥40mm
0.75kW-22kW
30kW-37kW
A≥10mm
A≥50mm
A≥50mm
A≥50mm
45kW-75kW
90kW-710kW
Hot Air
Cold Air
Installation Space Requirements
Power Ratings Size Requirements
Hot Air
Cold Air

Chapter 2 Mechanical Installation AT550 Series Inverter Manual
- 16 -
2.2.3 Multiple Inverters Installed Vertically: In occasions where multiple inverters need installed vertically
next to each other, the lower row of inverters’ dissipation of heat will cause a temperature rise of the upper
row of inverters, resulting in the overheat/overload errors of the upper row of inverters. Therefore, it is
recommended to take measures such as installing a insulation plate in between as the following the figure:
AT500
隔热导流板
AT500
Figure 2.1 Inverter Installation Diagram
Note: Please install an insulation plate according to the figure above when installing two inverters
vertically next to each other.
Attention Matters for Heat Dissipation of Mechanically Mounting:
1) The inverter should be installed vertically for heat dissipation but cannot be put upside down.
Installing the inverters side by side is highly recommended for installing a number of them in one
cabinet. Please refer to figure 3-1 when installing the insulation plate
2) Follow Figure3.1 to ensure the dissipation space for the inverters. The heat dissipation of other
machines in the cabinet should be considered as well.
3) The mounting bracket must be flame retardant material.
4) Installing the radiator outside the cabinet is recommended if there are metal dusts at the installation
location. Please make sure the sealed cabinet space is as large as possible.
Insulation Plate
AT550
AT550

AT550 Series Inverter Manual Chapter 2 Mechanical Installation
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2.3 Dismantling of the Cover Plate
挂钩
1.左右对称向内侧用力
压挂钩使挂钩松脱
2.将盖板往上旋转
Figure 2.2 Remove the Cover Plate (Plastic Case)
抓紧盖板下端并
往上旋转抽出
1.用螺丝刀卸下4颗
面板上的螺钉
Figure 2.3 Remove the Cover Plate (Metallic Case)
1. Press inward to disconnect the
hook from the hook slot.
2. Lift the cover to open
the inverter.
Hook
1. Loosen the screws.
2. Lift the cover to open the
inverter.

Chapter 3 Electrical Installation AT550 Series Inverter Manual
- 18 -
Chapter 3 Electrical Installation
3.1 Electrical Installation
Figure 3.1 Peripheral Electrical Devices
●Do not install capacitors or surge suppressor on the output side of the inverter ,which will lead to a
breakdown or cause damage to the capacitor the surge suppressor.
●Input/Output (Major Loop) of the inverter contains harmonics, which may interfere with the communication
devices connected to the inverter. Therefore, anti-interference filters are recommended to install in order to
minimize the interference.
●Please refer to the selection manual of peripheral equipment for more details of peripheral devices and
options.
Three-phase AC power supply
Moulded Case Circuit Breaker
(MCCB) or earth leakage circuit
breaker
Electromagnetic contactor
To guarantee safety, use an electromagnetic contactor.
Do not use it to start or stop the inverter because such
operation reduces the service life of the inverter
Select a proper breaker to resist large in-rush current
that flows into the inverter at power-on
Use within the allowable power supply specification
of the inverter
Ground
Noise filter on input side
Reduce the
electromagnetic
interference on
the input side
AC input reactor
Suppress the
high order
harmonic to
improve the
power factor
Motor
Braking resistor
Braking unit
Reliably ground the motor and the
inverter to prevent electric shock
AC output
reactor
Ground
AT550

AT550 Series Inverter Manual Chapter 3 Electrical Installation
- 19 -
3.2 Description of Peripheral Electrical Devices
Items
Function Descriptions
MCCB
Disconnect the power supply when over current occurs on downstream
devices
Residual Current
Circuit Breaker
(RCCB)
Since the output of the inverter is high-frequency pulse voltage,
high-frequency leakage occurs sometimes; When installing an RCCB
on the input side, it is recommended to choose the special-use RCCB.
It is suggested to choose the model “B” for RCCB, and the leakage
current is set to 300mA.
Contactor
Start and stop the inverter.
Avoid starting and stopping the inverter frequently by switching the
contactor on and off (less than twice per minute) nor use it to directly
start the inverter.
EMC
Input Filter
• Reduce the external conduction and radiation interference of the
inverter.
• Decrease the conducting interference flowing from the power
terminals to the inverter and improve the anti-interference capability
of the inverter.
AC Input
Reactor
• Improve the power factor of the input side;
• Eliminate the higher harmonics generation on the input side
effectively and prevent other devices from being damaged due to
distortion of the voltage waveform.
• Eliminate the imbalance among the power phases that causes the
imbalance of input current.
DC
Reactor
• Improve the power factor of the input side.
• Improve the efficiency and thermal stability of the inverter.
• Eliminate the impact of higher harmonics of the inverter input side
and reduce the external radiation and interference.
AC Output
Reactor
The output side of the inverter generally has much higher harmonics.
When the motor is far from the inverter, there is distributed
capacitance in the circuit and certain harmonics may cause resonance
in the circuit, bringing the following two effects:
• Impair the motor insulation performance and damage the motor on
the long run.
• Generate large leakage current and cause frequent protection of
tripping on the inverter. If the distance between the inverter and the
motor is greater than 100 m, an AC output reactor is recommended.
Table 3.1 Description of Peripheral Electrical Devices

Chapter 3 Electrical Installation AT550 Series Inverter Manual
- 20 -
3.3 Peripheral Electrical Components Selection Guidance
Converter model
MCCB
(A)
Contactor
(A)
Power Input
Cable
(mm2)
Power Output
Cable
(mm2)
Control Circuit
Wirings (mm2)
AT550-S2-0R4GB
10
9
0.75
0.75
0.5
AT550-S2-0R7GB
16
12
0.75
0.75
0.5
AT550-S2-1R5GB
25
18
1.5
1.5
0.5
AT550-S2-2R2GB
32
25
2.5
2.5
0.5
AT550-T3-0R7G/1R5PB
6
9
0.75
0.75
0.5
AT550-T3-1R5G/2R2PB
10
9
0.75
0.75
0.5
AT550-T3-2R2G/4R0PB
10
9
0.75
0.75
0.5
AT550-T3-4R0G/5R5PB
16
12
1.5
1.5
0.5
AT550-T3-5R5G/7R5PB
20
18
2.5
2.5
0.75
AT550-T3-7R5G/011PB
32
25
4.0
4.0
0.75
AT550-T3-011G/015PB
40
32
4.0
4.0
0.75
AT550-T3-015G/018PB
50
38
6.0
6.0
0.75
AT550-T3-018G/022PB
50
40
10
10
1.0
AT550-T3-022G/030PB
63
50
10
10
1.0
AT550-T3-030G/037P
100
65
16
16
1.0
AT550-T3-037G/045P
100
80
25
25
1.0
AT550-T3-045G/055P
125
95
35
35
1.0
AT550-T3-055G/075P
160
115
50
50
1.0
AT550-T3-075G/090P
225
170
70
70
1.0
AT550-T3-090G/110P
250
205
95
95
1.0
AT550-T3-110G/132P
315
245
120
120
1.0
AT550-T3-132G/160P
350
300
120
120
1.0
AT550-T3-160G/185P
400
300
150
150
1.0
AT550-T3-200G/220P
500
410
185
185
1.0
AT550-T3-220G/250P
630
475
2*120
2*120
1.0
AT550-T3-250G/280P
630
475
2*120
2*120
1.0
AT550-T3-280G/315P
700
620
2*120
2*120
1.0
AT550-T3-315G /355P
800
620
2*150
2*150
1.0
AT550-T3-355G /400P
1000
800
2*185
2*185
1.0
AT550-T3-400G /450P
1250
800
2*240
2*240
1.0
AT550-T3-450G
1250
1000
2*240
2*240
1.0
AT550-T3-500G
1600
1000
2*300
2*300
1.0
AT550-T3-560G
1600
1250
2*300
2*300
1.0
AT550-T3-630G
2000
1600
2*300
2*300
1.0
AT550-T3-710G
2500
2000
2*300
2*300
1.0
3.4 Selection of Braking Unit and Braking Resistor
Value selection of the Braking Resistor
The AC drive transfers regenerative energy generated during braking of motor to external
braking resistor.
According to the formula U* U/R = Pb:
• U: the braking voltage at system stable braking.
• U: value varies with the system. The 380 VAC power system usually selects 700 V braking
• Pb: braking power.
Power selection of the Braking Resistor
In theory, power of braking resistor is the same as braking power. But in consideration of de-rating, power of
braking resistor is calculated from the following formula:according to the formula :0.7 * Pr = Pb* D.