Inovance MD520 Series Installation instructions

‑1‑
Preface
Preface
About This Guide
The MD520 series AC drive is a general‑purpose high‑performance current vector
control AC drive. It is designed to control and regulate the speed and torque of three‑
phase AC asynchronous motors and permanent magnet synchronous motors. It can
be used to drive textile machines, paper making machines, wire drawing machines,
machine tools, packaging machines, food machines, fans, water pumps, and other
automated production equipment.
This guide describes the composition, technical specifications, components,
dimensions, options (including mounting accessories, cables, and peripheral
electrical devices), expansion cards, routine maintenance and repair, certifications,
and standards of the AC drive.
More Documents
Document Name Data No. Description
MD520 Series General‑
Purpose AC Drive Quick
Installation and
Commissioning Guide
19011712
This guide describes the installation, wiring,
commissioning, troubleshooting,
parameters, and fault codes of the AC drive.
MD520 Series General‑
Purpose AC Drive Hardware
Guide
19011713
This guide describes the composition,
technical specifications, components,
dimensions, options (including installation
accessories, cables, and peripheral
electrical components), and expansion
cards of the MD520 series AC drive, routine
maintenance and repair, certifications, and
standards of the AC drive.
MD520 Series General‑
Purpose AC Drive
Installation Guide
19011714
This guide describes the installation
dimensions, space design, specific
installation steps, wiring requirements,
routing requirements, option installation
requirements, and troubleshooting of
common EMC‑related problems.
MD520 Series General‑
Purpose AC Drive
Commissioning Guide
19011715
This guide describes the commissioning
tools, commissioning flows, and specific
commissioning steps, as well as
troubleshooting, fault codes, and
parameters related to the AC drive.
MD520 Series General‑
Purpose AC Drive
Communication Guide
19011716
This guide describes the communication
mode, communication networking, and
communication configuration of the AC
drive.
MD520 Series General‑
Purpose AC Drive Function
Guide
19011717
This guide describes function applications,
communication, fault codes, and
parameters of the AC drive.

‑2‑
Preface
Revision History
Date Version Description
January 2022 A00 First release.
How to Obtain
This guide is not delivered with the product. You can obtain the PDF version by the
following method:
Log in to Inovance's website (), choose Support > Download, search by keyword,
and then download the PDF file.

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Preface.............................................................................. 1
Product Model List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fundamental Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1 Product Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.1 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2 Nameplate and Model Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2 Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2 Components of T1 to T6 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 Components of T7 to T9 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.4 Components of T10 to T12 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3 System Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1 System Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2 Electrical Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.3 Main Circuit Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.4 Control Circuit Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4 Dimension Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.1 Dimensions of T1 to T9 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.2 Dimensions of T10 to T12 Models (Without AC Output Reactor) . . . . . . . . . . . . . . . . . . 34
4.3 Dimensions of T10 to T12 Models (with AC Output Reactor). . . . . . . . . . . . . . . . . . . . . . 35
5 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.1 List of Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.2 Mounting Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.2.1 Through‑Hole Mounting Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.2.2 Bottom Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.2.3 Guide Rail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2.4 Installing the UVW Output Copper Busbar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.3 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.3.1 Main Circuit Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.3.2 Selection of Control Circuit Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
5.4 Peripheral Electrical Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
5.4.1 Fuse, Contactor, and Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
5.4.2 AC Input Reactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.4.3 EMC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
5.4.4 Simple Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Table of Contents

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5.4.5 Braking Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
5.4.6 AFE Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
5.4.7 Output Reactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
5.4.8 Magnetic Ring and Ferrite Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
5.5 Operating Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
6 Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
6.1 List of Expansion Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
6.2 Installing the Expansion Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
7 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
7.1 Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
7.2 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
8 Routine Maintenance and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
8.1 Routine Inspection Items. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
8.1.1 Daily Inspection Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
8.1.2 List of Periodic Inspection Items. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
8.2 Main Circuit Insulation Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
8.3 Replacing Quick‑Wear Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
8.3.1 Service Life of Quick‑Wear Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
8.3.2 Replacing the Cooling Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
8.3.3 Replacing the Filter Electrolytic Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
8.4 Storage and Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
9 Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
9.1 Compliance List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
9.2 CE Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
9.2.1 Introduction to CE Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
9.2.2 Requirement for Compliance with EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
9.2.3 Requirements for Compliance with the LVD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.3 UL or cUL Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.4 KCC Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Table of Contents

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Product Model List
Product Model List
The following table lists mapping between the product model and structure.
Table –1 Mapping between product model and structure
Structure Model (Three Phase 380–480 V) Model (Three Phase 200–240
V)
Model (Single Phase 200‑240
V)
T1 MD520‑4T0.4B(S)
MD520‑4T0.7B(S)
MD520‑4T1.1B(S)
MD520‑4T1.5B(S)
MD520‑4T2.2B(S)
MD520‑4T3.0B(S)
MD520‑2T0.4B(S)
MD520‑2T0.7B(S)
MD520‑2T1.1B(S)
MD520‑2T1.5B(S)
‑
T2 MD520‑4T3.7B(S)
MD520‑4T5.5B(S)
MD520‑2T2.2B(S)
MD520‑2T3.7B(S)
MD520‑2S0.4B(S)
MD520‑2S0.7B(S)
MD520‑2S1.5B(S)
MD520‑2S2.2B(S)
T3 MD520‑4T7.5B(S)
MD520‑4T11B(S)
MD520‑2T5.5B(S) ‑
T4 MD520‑4T15B(S) MD520‑2T7.5B(S) ‑
T5 MD520‑4T18.5(B)(S)(‑T)
MD520‑4T22(B)(S)(‑T)
MD520‑2T11(B)(S)(‑T) ‑
T6 MD520‑4T30(B)(S)
MD520‑4T37(B)(S)
MD520‑2T15(B)(S)
MD520‑2T18.5(B)(S)
‑
T7 MD520‑4T45(B)(S)
MD520‑4T55(B)(S)
MD520‑2T22(B)(S)
MD520‑2T30(B)(S)
‑
T8 MD520‑4T75(B)(S)
MD520‑4T90(S)
MD520‑4T110(S)
MD520‑2T37(B)(S)
MD520‑2T45(S)
MD520‑2T55(S)
‑
T9 MD520‑4T132(S)
MD520‑4T160(S)
MD520‑2T75(S) ‑
T10 MD520‑4T200(S)(‑L)
MD520‑4T220(S)(‑L)
MD520‑2T90(S)
MD520‑2T110(S)
‑
T11 MD520‑4T250(S)(‑L)
MD520‑4T280(S)(‑L)
MD520‑2T132(S) ‑
T12 MD520‑4T315(S)(‑L)
MD520‑4T355(S)(‑L)
MD520‑4T400(S)(‑L)
MD520‑2T160(S)
MD520‑2T200(S)
‑
Note:
●(B): with the braking unit
●(S): with the safe torque off (STO) function
●(‑T): with the DC reactor
●(‑L): with the AC output reactor

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Fundamental Safety Instructions
Fundamental Safety Instructions
Safety Precautions
1. This chapter presents essential safety instructions for a proper use of the
equipment. Before operating the equipment, read through the guide and
comprehend all the safety instructions. Failure to comply with the safety
instructions may result in death, severe personal injuries, or equipment damage.
2. "CAUTION", "WARNING", and "DANGER" items in the guide only indicate some of
the precautions that need to be followed; they just supplement the safety
precautions.
3. Use this equipment according to the designated environment requirements.
Damage caused by improper use is not covered by warranty.
4. Inovance shall take no responsibility for any personal injuries or property damage
caused by improper use.
Safety Levels and Definitions
Indicates that failure to comply with the notice will result in death
or severe personal injuries.
Indicates that failure to comply with the notice may result in death
or severe personal injuries.
Indicates that failure to comply with the notice may result in minor
or moderate personal injuries or equipment damage.
General Safety Instructions
●Drawings in the guide are sometimes shown without covers or protective guards.
Remember to install the covers or protective guards as specified first, and then
perform operations in accordance with the instructions.
●The drawings in the guide are shown for illustration only and may be different
from the product you purchased.
Unpacking
●Do not install the equipment if you find damage, rust, or signs of use on the equipment
or accessories upon unpacking.
●Do not install the equipment if you find water seepage or missing or damaged
components upon unpacking.
●Do not install the equipment if you find the packing list does not conform to the
equipment you received.

‑7‑
Fundamental Safety Instructions
●Check whether the packing is intact and whether there is damage, water seepage,
dampness, and deformation before unpacking.
●Unpack the package by following the unpacking sequence. Do not strike the package
violently.
●Check whether there is damage, rust, or injuries on the surface of the equipment and
equipment accessories before unpacking.
●Check whether the package contents are consistent with the packing list before
unpacking.
Storage and Transportation
●Large‑scale or heavy equipment must be transported by qualified professionals using
specialized hoisting equipment. Failure to comply may result in personal injuries or
equipment damage.
●Before hoisting the equipment, ensure the equipment components such as the front
cover and terminal blocks are secured firmly with screws. Loosely‑connected
components may fall off and result in personal injuries or equipment damage.
●Never stand or stay below the equipment when the equipment is being hoisted by the
hoisting equipment.
●When hoisting the equipment with a steel rope, ensure the equipment is hoisted at a
constant speed without suffering from vibration or shock. Do not turn the equipment
over or let the equipment stay hanging in the air. Failure to comply may result in
personal injuries or equipment damage.
●Handle the equipment with care during transportation and mind your steps to prevent
personal injuries or equipment damage.
●When carrying the equipment with bare hands, hold the equipment casing firmly with
care to prevent parts from falling. Failure to comply may result in personal injuries.
●Store and transport the equipment based on the storage and transportation
requirements. Failure to comply will result in equipment damage.
●Avoid storing or transporting the equipment in environments with water splash, rain,
direct sunlight, strong electric field, strong magnetic field, and strong vibration.
●Avoid storing the equipment for more than three months. Long‑term storage requires
stricter protection and necessary inspections.
●Pack the equipment strictly before transportation. Use a sealed box for long‑distance
transportation.
●Never transport the equipment with other equipment or materials that may harm or
have negative impacts on this equipment.
Installation
●The equipment must be operated only by professionals with electrical knowledge.

‑8‑
Fundamental Safety Instructions
●Read through the guide and safety instructions before installation.
●Do not install this equipment in places with strong electric or magnetic fields.
●Before installation, check that the mechanical strength of the installation site can bear
the weight of the equipment. Failure to comply will result in mechanical hazards.
●Do not wear loose clothes or accessories during installation. Failure to comply may
result in an electric shock.
●When installing the equipment in a closed environment (such as a cabinet or casing),
use a cooling device (such as a fan or air conditioner) to cool the environment down to
the required temperature. Failure to comply may result in equipment over‑temperature
or a fire.
●Do not retrofit the equipment.
●Do not fiddle with the bolts used to fix equipment components or the bolts marked in
red.
●When the equipment is installed in a cabinet or final assembly, a fireproof enclosure
providing both electrical and mechanical protections must be provided. The IP rating
must meet IEC standards and local laws and regulations.
●Before installing devices with strong electromagnetic interference, such as a
transformer, install a shielding device for the equipment to prevent malfunction.
●Install the equipment onto an incombustible object such as a metal. Keep the
equipment away from combustible objects. Failure to comply will result in a fire.
●Cover the top of the equipment with a piece of cloth or paper during installation. This is
to prevent unwanted objects such as metal chippings, oil, and water from falling into the
equipment and causing faults. After installation, remove the cloth or paper on the top of
the equipment to prevent over‑temperature caused by poor ventilation due to blocked
ventilation holes.
●Resonance may occur when the equipment operating at a constant speed executes
variable speed operations. In this case, install the vibration‑proof rubber under the
motor frame or use the vibration suppression function to reduce resonance.
Wiring
●Equipment installation, wiring, maintenance, inspection, or parts replacement must be
performed only by professionals.
●Before wiring, cut off all the power supplies of the equipment, and wait for at least the
time designated on the equipment warning label before further operations because
residual voltage still exists after power‑off. After waiting for the designated time,
measure the DC voltage in the main circuit to ensure the DC voltage is within the safe
voltage range. Failure to comply will result in an electric shock.
●Do not perform wiring, remove the equipment cover, or touch the circuit board with
power ON. Failure to comply will result in an electric shock.
●Check that the equipment is grounded properly. Failure to comply will result in an
electric shock.

‑9‑
Fundamental Safety Instructions
●Do not connect the input power supply to the output end of the equipment. Failure to
comply will result in equipment damage or even a fire.
●When connecting a drive to the motor, check that the phase sequences of the drive and
motor terminals are consistent to prevent reverse motor rotation.
●Cables used for wiring must meet cross sectional area and shielding requirements. The
shield of the cable must be reliably grounded at one end.
●Fix the terminal screws with the tightening torque specified in the user guide. Improper
tightening torque may overheat or damage the connecting part, resulting in a fire.
●After wiring is done, check that all cables are connected properly and no screws,
washers or exposed cables are left inside the equipment. Failure to comply may result in
an electric shock or equipment damage.
●During wiring, follow the proper electrostatic discharge (ESD) procedure, and wear an
antistatic wrist strap. Failure to comply will damage the equipment or the internal
circuits of the equipment.
●Use shielded twisted pairs for the control circuit. Connect the shield to the grounding
terminal of the equipment for grounding purpose. Failure to comply will result in
equipment malfunction.
Power-on
●Before power‑on, check that the equipment is installed properly with reliable wiring and
the motor can be restarted.
●Check that the power supply meets equipment requirements before power‑on to
prevent equipment damage or a fire.
●After power‑on, do not open the cabinet door or protective cover of the equipment,
touch any terminal, or disassemble any unit or component of the equipment. Failure to
comply will result in an electric shock.
●Perform a trial run after wiring and parameter setting to ensure the equipment operates
safely. Failure to comply may result in personal injuries or equipment damage.
●Before power‑on, check that the rated voltage of the equipment is consistent with that
of the power supply. Failure to comply may result in a fire.
●Before power‑on, check that no one is near the equipment, motor, or machine. Failure
to comply may result in death or personal injuries.
Operation
●The equipment must be operated only by professionals. Failure to comply will result in
death or personal injuries.
●Do not touch any connecting terminals or disassemble any unit or component of the
equipment during operation. Failure to comply will result in an electric shock.

‑10‑
Fundamental Safety Instructions
●Do not touch the equipment casing, fan, or resistor with bare hands to feel the
temperature. Failure to comply may result in personal injuries.
●Prevent metal or other objects from falling into the equipment during operation. Failure
to comply may result in a fire or equipment damage.
Maintenance
●Equipment installation, wiring, maintenance, inspection, or parts replacement must be
performed only by professionals.
●Do not maintain the equipment with power ON. Failure to comply will result in an
electric shock.
●Before maintenance, cut off all the power supplies of the equipment and wait for at least
the time designated on the equipment warning label.
●In case of a permanent magnet motor, do not touch the motor terminals immediately
after power‑off because the motor terminals will generate induced voltage during
rotation even after the equipment power supply is off. Failure to comply will result in an
electric shock.
●Perform routine and periodic inspection and maintenance on the equipment according
to maintenance requirements and keep a maintenance record.
Repair
●Equipment installation, wiring, maintenance, inspection, or parts replacement must be
performed only by professionals.
●Do not repair the equipment with power ON. Failure to comply will result in an electric
shock.
●Before inspection and repair, cut off all the power supplies of the equipment and wait
for at least the time designated on the equipment warning label.
●When the fuse is blown or the circuit breaker or earth leakage current breaker (ELCB)
trips, wait for at least the time designated on the equipment warning label before
power‑on or further operations. Failure to comply may result in death, personal injuries
or equipment damage.
●When the equipment is faulty or damaged, the troubleshooting and repair work must be
performed by professionals that follow the repair instructions, with repair records kept
properly.
●Replace quick‑wear parts of the equipment according to the replacement instructions.
●Do not use damaged equipment. Failure to comply may result in death, personal
injuries, or severe equipment damage.
●After the equipment is replaced, check the wiring and set parameters again.

‑11‑
Fundamental Safety Instructions
Disposal
●Dispose of retired equipment in accordance with local regulations and standards.
Failure to comply may result in property damage, personal injuries, or even death.
●Recycle retired equipment by observing industry waste disposal standards to avoid
environmental pollution.
Safety Labels
For safe equipment operation and maintenance, comply with the safety labels on the
equipment. Do not damage or remove the safety labels. See the following table for
descriptions of the safety labels.
Safety Label Description
●Read through the safety instructions before operating the equipment.
Failure to comply may result in death, personal injuries, or equipment
damage.
●Do not touch the terminals or remove the cover with power ON or
within 10 min after power‑off. Failure to comply will result in an
electric shock.

Product Information
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1 Product Information
1.1 Characteristics
The MD520 series AC drive is designed to be a general‑purpose high‑performance
drive featuring rich functions, convenient operations, and aesthetic appearance.
Leveraging the current vector control technology, it precisely controls and regulates
the speed and torque of three‑phase AC asynchronous motors and permanent
magnet synchronous motors. The MD520 is suitable for various industries, such as
cable, machine tool, petrochemical, and natural gas.
Figure 1‑1 Product appearance
The MD520 highlights the following:
●Drives the three‑phase AC asynchronous motor and permanent magnet
synchronous motor.
●Enhances drive performance to enable synchronous and asynchronous motors to
deliver 150% torque output at zero speed without an encoder, simplifying the
drive and control process.
●Addresses technical‑ and performance‑related problems of equipment in
industries such as cables, machine tools, metal products, petrochemicals, natural
gas, lifting, pulping and paper making, textile, printing and dyeing, and ceramics.
●Supports the VVC algorithm to simplify and stabilize the synchronous motor,
especially at high speed.
●Inherits functions of the MD500‑PLUS, MD500, MD500E, MD290, and MD330 and be
compatible with MD500‑PLUS options, including PG cards, communication cards,
I/O extension cards, and brackets.

Product Information
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1.2 Nameplate and Model Number
Figure 1‑2 Nameplate and designation rule
Note
●For three‑phase 380 V to 480 V AC drives, reactors are not available for T1 to T4
models, while DC reactors are optional for T5 models and standard for T6 models
and above.
●For three‑phase 380 V to 480 V AC drives, braking units are standard for T1 to T4
models and optional for T5 to T8 models.

Components
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2 Components
2.1 Overview
The AC drive is structured in either of the following types:
●Plastic structure for T1 to T6 models
●Sheet metal structure for T7 to T12 models
2.2 Components of T1 to T6 Models
Figure 2‑1 Components of T1 to T4 models

Components
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Figure 2‑2 Components of T5 to T6 models

Components
‑16‑
2.3 Components of T7 to T9 Models
Figure 2‑3 Components of T7 to T9 models
Note
The quantity and layout of cooling fans vary with models.
●T7 models have one cooling fan at the top.
●T8 models have two cooling fans at the top.
●T9 models have two cooling fans at the bottom.

Components
‑17‑
2.4 Components of T10 to T12 Models
Figure 2‑4 Components of T10 to T12 models (without AC output reactor)

Components
‑18‑
Figure 2‑5 Components of T10 to T12 models (with AC output reactor)

System Structure
‑19‑
3 System Structure
3.1 System Connection Diagram
When the AC drive is used to control asynchronous motors, you must install a variety
of electrical devices on the input and output sides of the AC drive to ensure system
safety and stability. The following figure shows the system connection diagram.
Figure 3‑1 System connection diagram