OMRON 3G3AX-RBU User Guide

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Cat. No. I563-E1-01

USER’S MANUAL

3G3AX-RBU

Regenerative Braking Unit

Introduction

Thank you for choosing the Regenerative Braking Unit 3G3AX-RBU. This User's Manual (hereinafter called “this manual”) describes the installation/wiring of the 3G3AX-RBU model, as well as troubleshooting and inspection methods.

zThis manual should be delivered to the actual end user of the product. zAfter reading this manual, keep it handy for future reference. zThis manual describes the specifications and functions of the product as well as the relations

between them. You should assume that anything not described in this manual is not possible with the product.

zIntended readers

This manual is intended for: Those with knowledge of electrical systems (qualified electrical engineers or the equivalent), and also in charge of:

• Introducing the control equipment

• Designing the control system

• Installing and/or connecting the control equipment

• Field management

Introduction

Read and Understand This Manual

Please read and understand this manual before using the product. Please consult your OMRON representative if you have any questions or comments.

Warranty and Limitations of Liability

WARRANTY

OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if specified) from date of sale by OMRON.

OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.

LIMITATIONS OF LIABILITY

OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY.

In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.

IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE PRODUCTS UNLESS OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.

Read and Understand This Manual

Application Considerations

SUITABILITY FOR USE

OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's application or use of the products.

At the customer's request, OMRON will provide applicable third party certification documents identifying ratings and limitations of use that apply to the products. This information by itself is not sufficient for a complete determination of the suitability of the products in combination with the end product, machine, system, or other application or use.

The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible uses of the products, nor is it intended to imply that the uses listed may be suitable for the products:

• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this manual.

• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles, safety equipment, and installations subject to separate industry or government regulations.

• Systems, machines, and equipment that could present a risk to life or property.

Please know and observe all prohibitions of use applicable to the products.

NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

PROGRAMMABLE PRODUCTS

OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof.

Read and Understand This Manual

Disclaimers

CHANGE IN SPECIFICATIONS

Product specifications and accessories may be changed at any time based on improvements and other reasons.

It is our practice to change model numbers when published ratings or features are changed, or when significant construction changes are made. However, some specifications of the products may be changed without any notice. When in doubt, special model numbers may be assigned to fix or establish key specifications for your application on your request. Please consult with your OMRON representative at any time to confirm actual specifications of purchased products.

DIMENSIONS AND WEIGHTS

Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.

PERFORMANCE DATA

Performance data given in this manual is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of OMRON's test conditions, and the users must correlate it to actual application requirements. Actual performance is subject to the OMRON Warranty and Limitations of Liability.

ERRORS AND OMISSIONS

The information in this manual has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical, typographical, or proofreading errors, or omissions.

Safety Precautions

Indications and Meanings of Safety Information

In this user’s manual, the following precautions and signal words are used to provide information to ensure the safe use of the Regenerative Braking Unit 3G3AX-RBU. The information provided here is vital to safety. Strictly observe the precautions provided.

Meanings of Signal Words

Indicates an imminently hazardous situation which, if not

WARNING

CAUTION

avoided, is likely to result in serious injury or may result in death. Additionally there may be severe property damage.

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury, or in property damage.

Alert Symbols in This Document

Turn off the power supply and implement wiring correctly. Not doing so may result in a serious injury due to an electric shock.

Wiring work must be carried out only by qualified personnel. Not doing so may result in a serious injury due to an electric shock.

Be sure to ground the unit. Not doing so may result in a serious injury due to an electric shock or fire.

Do not remove the front cover during the power supply and 10 minutes after the power shutoff. Doing so may result in a serious injury due to an electric shock.

Do not operate the switches with wet hands. Doing so may result in a serious injury due to an electric shock.

Do not touch the inside of the Regenerative Braking Unit or terminals, and do not check a signal, wire, put on or take off the connectors while the power is being supplied. Doing so may result in a serious injury due to an electric shock or fire.

WARNING

Do not remove the front cover during the power supply. Doing so may result in a serious injury due to an electric shock. Be sure to put on the front cover before turning on the input power.

Turn off the input power of the Inverter and wait for more than 10 minutes before changing wiring or operating the DIP switch. Not doing so may result in a serious injury due to an electric shock.

Safety Precautions

Place covers on the openings or take other precautions to make sure that no metal objects such as cutting bits or lead wire scraps go inside when installing and wiring.

Install a stop motion device to ensure safety. Not doing so might result in a minor injury.

Be sure to use a specified type of Braking Resistor/Regenerative Braking Unit. In case of a Braking Resistor, install a thermal relay that monitors the temperature of the Resistor. Not doing so might result in a moderate burn due to the heat generated in the Braking Resistor/ Regenerative Braking Unit. Configure a sequence that enables the Inverter power to turn off when unusual overheating is detected in the Braking Resistor/Regenerative Braking Unit.

Do not connect Resistors to the DC terminals (P, N) directly. Doing so might result in a small-scale fire, heat generation or damage to the unit.

CAUTION

Do not touch the fins, Braking Resistors, which become too hot during the power supply and for some time after the power shutoff. Doing so may result in a burn.

The models of 3G3AX-RBU23/-RBU24/-RBU42/-RBU43 do not have terminals for the alarm input (R1, R2). Configure a sequence that enables the Inverter power to turn off when unusual overheating is detected.

The 3G3AX-RBC Braking Resistor does not have a built-in thermal fuse. Be sure to use the alarm contact terminals (AL1, AL2) of the Resistor and configure a sequence that enables the Inverter power to turn off when unusual overheating is detected. Not doing so might result in a small-scale fire, heat generation or damage to the unit.

Do not dismantle, repair or modify the product. Doing so may result in an injury.

Installation and Wiring

Turn off the power supply and implement wiring correctly. Not doing so may result in a serious injury due to an electric shock.

Wiring work must be carried out only by qualified personnel. Not doing so may result in a serious injury due to an electric shock.

Be sure to ground the unit. Not doing so may result in a serious injury due to an electric shock or fire.

Safety Precautions

WARNING

CAUTION

Place covers on the openings or take other precautions to make sure that no metal objects such as cutting bits or lead wire scraps go inside when installing and wiring.

Install a stop motion device to ensure safety. Not doing so might result in a minor injury.

Do not connect Resistors to the DC terminals (P, N) directly. Doing so might result in a small-scale fire, heat generation or damage to the unit.

Safety Precautions

Operation

Do not remove the front cover during the power supply and 10 minutes after the power shutoff. Doing so may result in a serious injury due to an electric shock.

Do not operate the switches with wet hands. Doing so may result in a serious injury due to an electric shock.

WARNING

CAUTION

Do not touch the fins, Braking Resistors, which become too hot during the power supply and for some time after the power shutoff. Doing so may result in a burn.

Maintenance and Inspection

Do not remove the front cover during the power supply. Doing so may result in a serious injury due to an electric shock. Be sure to put on the front cover before turning on the input power.

Turn off the input power of the Inverter and wait for more than 10 minutes before changing wiring or operating the DIP switch. Not doing so may result in a serious injury due to an electric shock.

Do not touch the fins, Braking Resistors, which become too hot during the power supply and for some time after the power shutoff. Doing so may result in a burn.

Safety Precautions

WARNING

CAUTION

Do not dismantle, repair or modify the product. Doing so may result in an injury.

Precautions for Safe Use

Installation and Storage

Do not store or use the product in the following places.

• Locations subject to direct sunlight.

• Locations subject to ambient temperature exceeding the specifications.

• Locations subject to relative humidity exceeding the specifications.

• Locations subject to condensation due to severe temperature fluctuations.

• Locations subject to corrosive or flammable gases.

• Locations subject to exposure to combustibles.

• Locations subject to dust (especially iron dust) or salt.

• Locations subject to exposure to water, oil, or chemicals.

• Locations subject to shock or vibration.

Transportation, Installation, and Wiring

Observe the following instructions during transportation, installation, and wiring.

• Do not drop or apply a strong impact on the product. Doing so may result in damaged parts or malfunction.

• Do not hold by the front cover, but hold by the fins during transportation.

• The specified wire size or larger one must be used for the power lines.

Model

(3G3AX-)

RBU21 17 Ω min. 3.5 mm2 min.

RBU22 17 Ω min. 3.5mm

RBU23

RBU24

RBU41 34 Ω min. 3.5 mm

RBU42

RBU43

Connectable

resistance

8 Ω min. 5.5 mm

5 to 7.9 Ω 8 mm

4 to 4.9 Ω 14 mm

4 Ω min. 14 mm

3 to 3.9 Ω 22 mm

2 to 2.9 Ω 38 mm

17 Ω min. 3.5 mm

13 to 16.9 Ω 5.5 mm

10 to 12.9 Ω 8 mm

10 Ω min. 8 mm

7.5 to 9.9 Ω 14 mm

6 to 7.4 Ω 22 mm

P, RB, N

connection wires

min.

SL1, SL2, MA1, MA2

connection wires

0.75 mm

min. 5.5 mm2 min.

Ground wire

Note 1. For wires connecting to the P, RB and N terminals use an MLFC wire (flame retardant

Polyflex wire, dielectric strength of 600 V).

Note 2. If the wiring length between the Regenerative Braking Unit and Braking Resistor exceeds

10 m, use the wire size larger than the specified one.

A wire of more than 10 m to 25 m : One rank higher wire size

A wire of more than 25 m to 50 m : Two ranks higher wire size For the 3G3AX-RBU42 model, keep the wiring length between the Regenerative Braking Unit and Braking Resistor within 5 m.

Maintenance and Inspection

Be sure to confirm safety before conducting maintenance, inspection or parts replacement.

Precautions for Safe Use

Precautions for Correct Use

Installation

Mount the product on the vertical wall. The material of the wall has to be nonflammable such as a metal plate, and do not place flammable materials nearby.

3G3AX-RBU21/RBU22/RBU41/RBU42

10 cm min.

5 cm min.5 cm min.

10 cm min.

3G3AX-RBU23/RBU24/RBU43

5 cm min.5 cm min.

10 cm min.

5 cm min.5 cm min.

Note. The product cannot be mounted horizontally, but vertically only.

Rated Voltage

Confirm that the rated voltage of the product is the same as that of the Inverter to be used.

10 cm min.

Product Disposal

Comply with the local ordinance and regulations when disposing of the product.

Warning Labels

Warning labels are located on the product as shown in the following illustration. Be sure to follow the instructions.

Precautions for Correct Use

Warning Description

Checking Before Unpacking

Checking the Product

On delivery, be sure to check that the delivered product is the Regenerative Braking Unit 3G3AX-RBU model that you ordered. Should you find any problems with the product, immediately contact your nearest local sales representative or OMRON sales office.

Checking the Nameplate

Regenerative Braking Unit

model name

Voltage specifications

Checking the Model

3G3AX− RBU21

Checking the Accessories

Note that this manual is the only accessory included with the Regenerative Braking Unit 3G3AX-RBU model. Mounting screws and other necessary parts must be provided by the user.

Serial number

Maximum applicable motor capacity

24200-V class

400-V class

Regenerative Braking Unit

Revision History

A manual revision code appears as a suffix to the catalog number located at the lower left of the front and back covers.

Revision History

Cat.No.

Revision

code

01 April 2008 First printing

Revision date Changes and revision pages

I563-E1-01

Revision cod

About This Manual

This User's Manual is compiled chapter by chapter for user's convenience as follows: Understanding the following configuration ensures more effective use of the product.

Chapter Overview

Chapter 1 Design

Chapter 2 Functions Describes the DIP switch settings.

Chapter 3

Chapter 4

Chapter 5 Specifications Describes the product specifications and dimensions.

Maintenance Operations

Inspection and Maintenance

Describes installation and wiring procedures, terminal names and other information required for design.

Describes the analysis of possible trouble causes as well as troubleshooting methods.

Describes items for periodic inspection and/or maintenance for the product.

Introduction.............................................................................................. 1

Read and Understand This Manual.........................................................2

Safety Precautions ..................................................................................5

Precautions for Safe Use......................................................................... 10

Precautions for Correct Use ....................................................................12

Checking Before Unpacking ....................................................................14

Revision History....................................................................................... 15

About This Manual...................................................................................16

Chapter 1 Design

1-1 Wiring....................................................................................................... 1-1

1-2 Terminals ................................................................................................. 1-3

1-3 Removing the Built-in Resistor ................................................................1-6

1-4 Connection............................................................................................... 1-7

Chapter 2 Functions

2-1 DIP Switch Setting ................................................................................... 2-1

Chapter 3 Maintenance Operations

3-1 Precautions before Operation.................................................................. 3-1

3-2 When the Alarm Contact is Activated ...................................................... 3-2

3-3 When an Inverter Overvoltage Trip Occurs ............................................. 3-3

Chapter 4 Inspection and Maintenance

4-1 Inspection and Maintenance.................................................................... 4-1

4-2 Daily Inspection and Periodic Inspection .................................................4-2

4-3 Megger Test.............................................................................................4-4

4-4 Checking the Main Element..................................................................... 4-5

4-5 Capacitor Life Curve ................................................................................ 4-6

Chapter 5 Specifications

5-1 Standard Specification List ...................................................................... 5-1

5-2 Dimensional Drawing...............................................................................5-5

Contents

Chapter 1

Design

1-1 Wiring................................................................ 1-1

1-2 Terminals .......................................................... 1-3

1-3 Removing the Built-in Resistor....................... 1-6

1-4 Connection ....................................................... 1-7

1-1 Wiring

1Design

Design

1-1 Wiring

For connections of the Regenerative Braking Unit, Inverter and Braking Resistor (P, RB, and N terminals), use cables with the following length:

Model

(3G3AX-)

RBU21 5 m max. 5 m max.

RBU22 5 m max. 5 m max.

RBU23 4 m max. 50 m max.

RBU24

RBU41 5 m max. 5 m max.

RBU42 4 m max. 5 m max.

RBU43 4 m max. 50 m max.

The wiring must be routed at the shortest distance. Be sure not to coil up any surplus cables. Doing so may cause a fault in the equipment. The cable connected to the P and N terminals for wiring between the Regenerative Braking Unit and the Inverter, as well as the cable connected to the P and RB terminals for wiring between the Regenerative Braking Unit and the Braking Resistor must be bundled with a tie band, so that these cables are not placed at a distance.

Between Regenerative Braking Unit and

Inverter

Braking resistance: 4 Ω min. 4 m max.

Less than 4 Ω 3 m max.

Between Regenerative Braking Unit and

Braking Resistor

50 m max.

Correct example :

Incorrect example :

In order to prevent the Braking Register in the Regenerative Braking Unit from burning due to overheating, be sure to connect the alarm contacts (AL1 and AL2) and provide a circuit to turn off the primary power supply for the Inverter.

When several Regenerative Braking Units are connected in parallel, the length of the signal cables (MA1, MA2, SL1, SL2) between individual Regenerative Braking Units must be 5 m or less, and the cable size must be 0.75 mm cable.

Inverter

Main circuit cable

Regenerative

Braking Unit

Regenerative

Braking Unit

or more. Be sure to separate the signal cables from the main circuit

Signal cable

10 cm min.

Braking

Resistor

Braking

Resistor

1-1

1-1 Wiring

When multiple resistors are used in combination, a voltage rise during switching is increased due to the internal inductive components of the resistor. In this case, increase the cable size, or twist the cable. For the Braking Resistor, use a non-inductive resistor. Do not use six or more resistors in combination.

For connections on the PCB terminal block, be sure to use crimp terminals with insulation coating.

To use the optional Braking Resistor, select the model with combined resistance higher than the specified connectable resistance. If a resistor whose resistance is less than the connectable resistance is used, it may result in a fault of the Regenerative Braking Unit. Use thorough caution in regards to the resistance. When using these Braking Resistors, be sure to remove the built-in resistor. (3G3AX-RBU21/RBU22/-RBU41 only)

Model

(3G3AX-)

RBU21 17 Ω min.

RBU22 17 Ω min.

RBU23 4 Ω min.

RBU24 2 Ω min.

RBU41 34 Ω min.

RBU42 10 Ω min.

Connectable resistance

Design

RBU43 6 Ω min.

1-2

1-2 Terminals

Design

1-2 Terminals

Terminal Position and Arrangement

The terminal arrangement on the Regenerative Braking Unit is shown below.

3G3AX-RBU21/-RBU22/-RBU41

Main circuit terminals (screw size:M4) Tightening torque: 1.2 to 1.3 N⋅m

NRB P P

Control circuit terminals (screw size:M3) Tightening torque: 0.6 to 0.9 N⋅m

SL1 SL2

Alarm terminals (screw size:M3) Tightening torque: 0.5 to 0.6 N⋅m

AL1 AL2 R1 R2

MA1 MA2

3G3AX-RBU42

1-3

Main circuit terminals (screw size:M5) Tightening torque: 3.4 to 3.7 N⋅m

NRB

Control circuit terminals (screw size:M3) Tightening torque: 0.6 to 0.9 N⋅m

SL1 SL2 MA1

MA2 AL1 AL2

1-2 Terminals

3G3AX-RBU23/-RBU43

3G3AX-RBU24

Main circuit terminals (screw size:M8) Tightening torque: 12 to 13.5 N⋅m

NRB

Control circuit terminals (screw size:M3) Tightening torque: 0.6 to 0.9 N⋅m

SL1 SL2 MA1 MA2

Alarm terminals (screw size:M3) Tightening torque: 0.6 to 0.9 N⋅m

AL2 AL1

Main circuit terminals (screw size:M10) Tightening torque: 25 to 28 N⋅m

NRB

Design

Control circuit terminals (screw size:M3) Tightening torque: 0.6 to 0.9 N⋅m

SL1 SL2 MA1 MA2

Alarm terminals (screw size:M3) Tightening torque: 0.5 to 0.6 N⋅m

AL2 AL1

1-4

1-2 Terminals

Terminal Description

Design

Terminal name

Main circuit terminal

Control circuit terminal

Alarm terminal

Terminal

symbol

N Connect to the N/− terminal of the Inverter.

Connect to the Braking Resistor.

P Connect to the P/+2 terminal of the Inverter.

SL1 SL2

MA1 MA2

AL1 AL2

R1 R2

With the default connection, this terminal is connected to the builtin resistor. (Only for the models 3G3AX-RBU21/-RBU22/-RBU41)

Connect to the Braking Resistor. With the default connection, this terminal is connected to the builtin resistor. (Only for the models 3G3AX-RBU21/-RBU22/-RBU41)

Connect to the MA1 and MA2 terminals of a master unit when used as slave unit terminals in parallel operation.

Connect to the SL1 and SL2 terminals of a slave unit when used as master unit terminals in parallel operation.

The alarm output terminals for the Regenerative Braking Unit. Provide a circuit to turn off the primary power supply for the Inverter when the temperature relay of the built-in resistor or optional Braking Resistor is activated.

Connect to the AL1, AL2 (1, 2) terminals of the Braking Resistor when the optional Braking Resistor is used. Short-circuit between the AL1 and AL2 terminals when the optional Braking Resistor is not used. (Only for the models 3G3AX-RBU21/-RBU22/-RBU41)

Description

1-5

1-3 Removing the Built-in Resistor

To remove the built-in resistor, follow the procedure described below (3G3AX-RB21/-RBU22/RBU41 only).

1. Disconnect the lead wires connected from the built-in resistor to the P and RB terminals on the PCB, and to the R1 and R2 terminals on the fin.

PCB

AL1

AL2

Fin

Design

Disconnect all four cables.

Built-in resistor

2. Remove the built-in resistor from the bottom of the unit.

3. Reconnect the wiring between the AL1 and R1 terminals and between the AL2 and R2 terminals on the fin.

1-6

1-4 Connection

Design

1-4 Connection

3G3AX-RBU21/-RBU22 Connection Example

When the built-in resistor is used

The following is an example of connections using the built-in resistor. Up to five units can be connected in parallel. For DIP switch settings, refer to "2-1 DIP Switch Setting"(page 2-1).

MC1

MC2

BSS

Inverter

R/L1

S/L2

T/L3

U/T1

V/T2

W/T3

P/+2

N/-

Motor

SL1SL2 AL1AL2

P P N

MA1MA2

3-phase

200 V

MC2

MCB

MC1

3G3AX-RBU21

/-RBU22

Master

MC1

MC2

(*1)

1-7

Alarm terminal internal connections

SL1SL2 AL1 AL2

AL1 AL2

Built-in resistance temperature relay

P P

3G3AX-RBU21

/-RBU22

Slave

MA1MA2

SL1 SL2 AL1 AL2

P P

3G3AX-RBU21

/-RBU22

Slave

MA1MA2

*1. To select RY, check the MC coil and RY contact specifications.

1-4 Connection

When the optional Braking Resistor 3G3AX-RBA/-RBB/-RBC is used

The following is an example of connections using the Braking Resistor 3G3AX-RBA/-RBB/-RBC. Up to five units can be connected in parallel. For parallel connection, use Braking Resistors with the same resistance. Be sure to remove the built-in resistor from the bottom of the Regenerative Braking Unit. For DIP switch settings, refer to "2-1 DIP Switch Setting"(page 2-1).

MC1

3-phase

200 V

MC2

BSS

MC2

MCB

MC1

R/L1

S/L2

T/L3

Inverter

U/T1

V/T2

W/T3

P/+2

N/-

Motor

SL1 SL2 AL1 AL2

P P

3G3AX-RBU21

MA1MA2

/-RBU22

Master

MC1

MC2

3G3AX-RBA

/-RBB/-RBC

1(AL1)

2(AL2)

Design

(*1)

Alarm terminal internal connections

AL1 AL2

Built-in resistance temperature relay

Temperature relay

*1. To select RY, check the MC coil and RY contact specifications.

•To use the Braking Resistor (3G3AX-RBA/-RBB/-RBC), be sure to remove the built-in resistor. If the Braking Resistor (3G3AX-RBA/-RBB/-RBC) is used with the built-in resistor connected, it may cause the built-in resistor to burn due to overheating, or result in an overheating detection failure when the Braking Resistor temperature relay is activated.

•To prevent overheating, be sure to connect the alarm contacts 1 (AL1) and 2 (AL2) of the Braking Resistor.

3G3AX-RBA /-RBB/-RBC

1 (AL1)

2 (AL2)

SL1 SL2 AL1 AL2

P P

3G3AX-RBU21

/-RBU22

Slave

MA1MA2

SL1 SL2 AL1 AL2

P P

3G3AX-RBU21

/-RBU22

Slave

MA1MA2

3G3AX-RBA

/-RBB/-RBC

1(AL1)

2(AL2)

3G3AX-RBA

/-RBB/-RBC

1(AL1)

2(AL2)

1-8

1-4 Connection

Design

3G3AX-RBU41 Connection example

When the built-in resistor is used

The following is an example of connections using the built-in resistor. Up to five units can be connected in parallel. For DIP switch settings, refer to "2-1 DIP Switch Setting"(page 2-1).

MC1

MC2

200 V 50/60 Hz 220 V 60 Hz Operation power supply

MCB

400 V

3-phase

MC1

MC2

R/L1

S/L2

T/L3

Inverter

U/T1

V/T2

W/T3

P/+2

N/-

BSS

Motor

SL1 SL2 AL1 AL2

P P

3G3AX-RBU41

MA1MA2

Master

MC1

MC2

(*1)

Alarm terminal internal connections

AL1 AL2

Built-in resistance temperature relay

SL1 SL2 AL1 AL2

P P

3G3AX-RBU41

P P N

Slave

MA1MA2

SL1 SL2 AL1 AL2

3G3AX-RBU41

Slave

MA1MA2

*1. To select RY, check the MC coil and RY contact specifications.

1-9

1-4 Connection

When the optional Braking Resistor 3G3AX-RBA/-RBB/-RBC is used

MC1

MC2

(*1)

1(AL1)

2(AL2)

1(AL1)

2(AL2)

200 V 50/60 Hz 220 V 60 Hz Operation power supply

MCB

3-phase

400 V

MC1

MC2

MC1

R/L1

S/L2

T/L3

MC2

Inverter

U/T1

W/T3

P/+2

V/T2

N/-

BSS

Motor

SL1 SL2 AL1 AL2

P P

3G3AX-RBU41

MA1MA2

Master

Design

Alarm terminal internal connections

AL1 AL2

Built-in resistance temperature relay

Temperature relay

*1. To select RY, check the MC coil and RY contact specifications.

3G3AX-RBA /-RBB/-RBC

1(AL1)

2(AL2)

SL1 SL2 AL1 AL2

P P

3G3AX-RBU41

P P N

Slave

MA1MA2

SL1 SL2 AL1 AL2

3G3AX-RBU41

Slave

MA1MA2

3G3AX-RBA/-RBB/-RBC

Two resistors connected in series

1(AL1)

2(AL2)

1(AL1)

2(AL2)

1(AL1)

2(AL2)

1(AL1)

2(AL2)

3G3AX-RBA/-RBB/-RBC

Two resistors connected in series

3G3AX-RBA/-RBB/-RBC

Two resistors connected in series

1-10

Design

1-4 Connection

•To use the Braking Resistor (3G3AX-RBA/-RBB/-RBC) for 3G3AX-RBU41, be sure to connect two resistors of the same model in series. If the 3G3AX-RBU41 is operated with a single resistor, the Braking Resistor may have a fault.

•To prevent overheating, be sure to connect the alarm contacts 1 (AL1) and 2 (AL2) of the Braking Resistor.

1-11

1-4 Connection

3G3AX-RBU23/-RBU24 Connection Example

When the optional Braking Resistor 3G3AX-RBA/-RBB/-RBC is used

The following is an example of connections using the Braking Resistor 3G3AX-RBA/-RBB/-RBC. Up to two units can be connected in parallel. For parallel connection, use Braking Resistors with the same resistance. For DIP switch settings, refer to "2-1 DIP Switch Setting"(page 2-1).

MC1

MC2

/-RBU24

Master

MC1

MC2

3G3AX-RBA

/-RBB/-RBC

1(AL1)

2(AL2)

3-phase

200 V

BSS

MC2

MCB

MC1

Inverter

R/L1

S/L2

T/L3

U/T1

V/T2

W/T3

P/+2

N/-

Motor

SL1 SL2 AL1 AL2

P P

3G3AX-RBU23

MA1MA2

Design

(*1)

SL1 SL2 AL1 AL2

P P

3G3AX-RBU23

/-RBU24

Slave

MA1MA2

*1. To select RY, check the MC coil and RY contact specifications.

•To prevent overheating, be sure to connect the alarm contacts 1 (AL1) and 2 (AL2) of the Braking Resistor.

•The models of 3G3AX-RBU23/-RBU24 do not have terminals for the alarm input (R1, R2). Configure a sequence that enables the Inverter power to turn off when unusual overheating is detected.

3G3AX-RBA

/-RBB/-RBC

1(AL1)

2(AL2)

1-12

1-4 Connection

Design

3G3AX-RBU42/-RBU43 Connection Example

When the optional Braking Resistor 3G3AX-RBA/-RBB/-RBC is used

MC1

200 V 50/60 Hz 220 V 60 Hz Operation power supply

MCB

3-phase

400 V

MC1

MC2

R/L1

S/L2

T/L3

MC2

Inverter

U/T1

V/T2

W/T3

P/+2

N/-

BSS

Motor

SL1 SL2 AL1 AL2

P P

3G3AX-RBU42

MA1MA2

/-RBU43

Master

MC1

MC2

3G3AX-RBA

/-RBB/-RBC

1(AL1)

2(AL2)

(*1)

SL1 SL2 AL1 AL2

P P

3G3AX-RBU42

/-RBU43

Slave

MA1MA2

•A voltage of 800 V DC (max.) is applied to the Braking Resistor. Check the rated dielectric strength of the resistor to be connected.

•To use the optional Braking Resistor (3G3AX-RBA/-RBB/-RBC), be sure to connect two resistors of the same model in series. If the 3G3AX-RBU42 or -RBU43 is operated with a single resistor, the Braking Resistor may have a fault.

•To prevent overheating, be sure to connect the alarm contacts 1 (AL1) and 2 (AL2) of the Braking Resistor.

•The models of 3G3AX-RBU42/-RBU43 do not have terminals for the alarm input (R1, R2). Configure a sequence that enables the Inverter power to turn off when unusual overheating is detected.

*1. To select RY, check the MC coil and RY contact specifications.

3G3AX-RBA

/-RBB/-RBC

1(AL1)

2(AL2)

1-13

Chapter 2

Functions

2-1 DIP Switch Setting ........................................... 2-1

2-1 DIP Switch Setting

2Functions

2-1 DIP Switch Setting

Operating voltage level setting (SW1, SW2)

Functions

Parallel operation settings (SW3, SW4)

Set up operating voltage level and parallel operation with the DIP switches.

Note: Be sure to turn off the power supply before setting the DIP switches.

The operating voltage of the Regenerative Braking Unit can be set at 3 levels: “Standard” (default setting), “−5 %” and “−10 %”, by the DIP switch settings. This function is useful in preventing an overvoltage trip by lowering the operating voltage of the Regenerative Braking Unit when an overvoltage trip occurs due to the receiving voltage, deceleration time or other factor. Depending on the receiving voltage, however, the Regenerative Braking Unit will operate continuously even by just turning on the Inverter power supply. When you change the DIP switch settings, use thorough caution in regards to the receiving voltage.

Receiving voltage × √2 + 20 V < Operating voltage

Interlocking operation can be performed by two units (master and slave units) in parallel connection via the signal lines (MA1, MA2, SL1, SL2) connection between the units and the DIP switch setting. When a unit is set as the slave using the DIP switches, the operating voltage of the slave unit depends on the master unit settings. The DIP switch settings are as follows:

Note: The DIP switches are located at the upper left of the PCB in the Regenerative Braking Unit.

The switch numbers are indicated on the switch body.

Setting functions

Master unit Operating voltage level: Standard

Master unit Operating voltage level:

−5 %

Master unit Operating voltage level:

−10 %

Slave unit

(X: Either ON or OFF is acceptable.)

DIP switch setting

OFF

OFF2ON3ON

1ON2ON3ON4

1X2

OFF3ON

Note

OFF

Default setting

Operating voltage of the slave unit depends on the master unit settings.

2-1

Chapter 3

Maintenance Operations

3-1 Precautions before Operation......................... 3-1

3-2 When the Alarm Contact is Activated ............ 3-2

3-3 When an Inverter Overvoltage Trip Occurs... 3-3

3-1 Precautions before Operation

3Maintenance Operations

3-1 Precautions before Operation

Before operation, check the following items:

• There is no incorrect wiring. Incorrect wiring may result in damage or malfunction of the Regenerative Braking Unit.

• Check for grounding of any terminal other than the ground terminal. Improper grounding may result in damage or malfunction of the Regenerative Braking Unit.

• Check for any short-circuits caused by a wire scrap or crimp terminal left in the unit after wiring work. A short circuit may result in damage or malfunction of the Regenerative Braking Unit.

• There is no short circuit or ground fault. A short circuit or ground fault may result in damage or malfunction of the Regenerative Braking Unit.

Maintenance Operations

3-1

3-2 When the Alarm Contact is Activated

In principle, the alarm contacts of the Regenerative Braking Unit are activated when the Braking Resistor is overheated by excessive regenerative energy or frequent braking. As a countermeasure, review the capacity of the Braking Resistor, model and number of Regenerative Braking Units, as well as Inverter deceleration time. Incorrect wiring and improper receiving voltage can be also considered as a cause of an alarm. Use the flowchart to diagnose the problem:

Alarm contact is activated.

Is the main element (IGBT) defective? (*1)

Is the resistance higher than "connectable resistance" selected?

YES

Regenerative Braking Unit is defective. Replace or repair the unit.

Maintenance Operations

YES

Are the units in parallel operation?

Is the operation LED indicator lit in any other status than Inverter deceleration (during Inverter acceleration, or in standby status)?

Is the main circuit terminals correctly wired?

Review the resistor selection.

YES

During operation, are the operation LED indicators of all units lit?

YES

Does either the master or slave unit have a wire breakage?

YES

Is the Inverter's receiving voltage outside ±10 % of the rated voltage?

Is the control circuit terminals correctly wired? (For single operation, this terminal need not be connected.)

YES

Check the wiring and DIP switch settings are correct.

YES

Replace the resistor. Review resistor selection.

YES

Correct the voltage.

Be sure to wire correctly and securely.

*1. For the IGBT check procedure, refer to "4-4 Checking the Main Element"(Page 4-5).

The Regenerative Braking Unit is defective. Replace or repair the unit.

3-2

3-3 When an Inverter Overvoltage Trip Occurs

In principle, an Inverter overvoltage trip occurs when the Inverter cannot completely absorb a voltage rise due to excessive regenerative energy. As a countermeasure, review the resistance of the Braking Resistor, model and number of Regenerative Braking Units, as well as Inverter deceleration time. Wire breakage in the Breaking Resistor, incorrect wiring, and/or improper DIP switch settings can be also considered as a cause of an In-

verter overvoltage trip. Use the flowchart to diagnose the problem:

Overvoltage trip occurs.

During Inverter deceleration, is the operation LED indicator lit?

Maintenance Operations

Are the DIP switches set to slave?

Set the DIP switches to slave.

YES

The Braking Resistor model selection is improper. Review resistor selection, or extend the inverter deceleration time. (There may be a wire breakage in the Braking Resistor.)

Is the operation LED indicator on the master unit (or the unit in single operation) unlit?

YES

Is wiring between the P and N terminals, as well as the control circuit terminals connection correct?

YES

The Regenerative Braking Unit is defective. Replace or repair the unit.

YES

Are the DIP switches set to master?

YES

Be sure to wire correctly and securely.

Set the DIP switches to master.

NONO

3-3

Chapter 4

Inspection and Maintenance

4-1 Inspection and Maintenance........................... 4-1

4-2 Daily Inspection and Periodic Inspection...... 4-2

4-3 Megger Test ...................................................... 4-4

4-4 Checking the Main Element ............................ 4-5

4-5 Capacitor Life Curve ........................................ 4-6

4-1 Inspection and Maintenance

4Inspection and Maintenanc e

4-1 Inspection and Maintenance

Daily Inspection

Basically, check the following during operation.

1) There are no errors in the installation environment.

2) There are no errors in the cooling system.

3) There are no abnormal vibrations or sounds.

Cleaning

4) There are no abnormal overheat or discoloration.

5) There are no abnormal odors.

Always keep the Regenerative Braking Unit clean for operation. Lightly remove any dirt with a soft cloth moistened with a neutral detergent.

Note: Do not use such solutions as acetone, benzene, toluene, or alcohol for cleaning. Doing so

may cause the Regenerative Braking Unit surface to dissolve or its coating to come off.

Periodic Inspection

Check the parts that cannot be checked without stopping operation, as well as those that require periodic inspection.

1) Check that there are no errors in the cooling system (Clean the air filter).

2) Check that all parts that need tightening are secure (Screws and bolts may become loose because

of vibration or temperature change).

Inspection and Maintenance

3) Check that there is no corrosion or damage to the conductors and/or insulators.

4) Measurement of insulation resistance

5) Check and replace the capacitor.

4-1

4-2 Daily Inspection and Periodic Inspection

Inspection

Daily

period

Inspection method Criteria Meter

year

Inspec-

tion part

Inspec-

tion item

Inspection point

General

Main circuit

Ambient environment

Entire device

General

Check ambient temperature, as well as humidity and dust levels.

Check that there are no abnormal vibrations or sounds.

Megger test (between main circuit terminal and ground terminal)

Check that any parts which may need tightening are secure.

Check that no part has indications of overheating.

{

Refer to "Installation"(Page 12).

Visual or acoustic inspection

Disconnect the wirings of the main and the control circuit terminals, use a megger to measure the resistance

{

between the ground terminal and the short-circuited parts of main circuit terminals P, RB, and N.

Tighten securely.

Visual inspection

Ambient temperature

−10 °C to 50 °C, no freezing Ambient humidity 90 % max., no condensation.

No faults

5 M Ω min. Refer to "4-3 Megger Test".

No faults

Thermometer, Hygrometer, Recorder

500 V DC megger

Inspection and Maintenance

Connection conductor and wire

Terminal block

Check that there is no distortion with the conductor.

Check that there is no tearing in the wire coverings.

Check that there is no damage.

{

Visual inspection No faults

{

Visual inspection No faults

{

4-2

4-2 Daily Inspection and Periodic Inspection

Inspection

Daily

{

period

Inspection method Criteria Meter

year

Visual inspection. Cement resistor, wire-wound resistor, etc.

Disconnect one end of the cable, and measure the

{

resistance using a tester.

Simulate the protection circuit

{

output

No faults

Error must be within ±10% of the nominal resistance.

Error is found in the sequence.

Tester, Digital multimeter

Inspec-

tion part

Main circuit

Control circuit Protection circuit

Inspec-

tion item

Resistor

Operation check

Inspection point

There are no crack or discoloration.

Check for any wire breakage

Check that there are no errors in protection and display circuits through sequence protection operation.

Check that there are no abnormal

General

Components

Inspection and Maintenance

Smoothing capacitor on the PCB

*1.

odors, discoloration, or significant rusting.

Check that there is no liquid leakage.

Check that the safety valve has not come out and that there are no bulges.

The life of the capacitor depends on ambient temperatures. Refer to "4-5 Capacitor Life Curve"(Page 4-6) for the replacement reference.

•Do not conduct a withstand voltage test on any part of the Regenerative Braking Unit. The Regenerative Braking Unit uses semiconductors in the main circuit. If the unit undergoes a withstand voltage test, it may cause semiconductor deterioration.

{

Visual inspection No faults

{

Visual inspection

No faults Standard replacement period: 5 years (*1)

4-3

4-3 Megger Test

For a megger test of the external circuit, be sure to disconnect all the terminals of the Regenerative Braking Unit, so as not to apply the test voltage to the Regenerative Braking Unit. Use a high resistance tester for a power distribution test of the control circuit. Do not use a megger or buzzer. Conduct a Regenerative Braking Unit megger test only to the main circuit, not to the control circuit. Use a 500 V DC megger for a megger test. Gradually increase the applied voltage, and reduce it to 0 V. To conduct a megger test for the main circuit, short-circuit the P, RB and N terminals with a wire.

Regenerative Braking Unit

4-3 Megger Test

500 V DC megger

Ground terminal

Applied voltage Applied voltage

Time Time

0.1 s min. 0.1 s min.

Note: Do not connect the power cable.

Inspection and Maintenance

4-4

4-4 Checking the Main Element

The quality of the main element can be checked using a tester.

Preparation

Make preparations for the check by following the procedure below.

1. Disconnect the cables (N, RB, P and P terminals), and the built-in resistor cable (RB and P terminals).

Checking method

2. Prepare a tester. (Usable range is 1 Ω measurement resistance.)

The quality can be judged by measuring the conduction state of the N, RB and P terminals on the Regenerative Braking Unit terminal block (main circuit terminals) while alternating the tester polarity.

Inspection and Maintenance

• First, measure the voltage between the P and N terminals in the DC voltage range. Then, make

sure that there is no residual voltage before performing the check.

• A nearly infinite value is shown in a no-conduction state. The value shown ranges from a few to a

few dozen Ω in a conduction state. If the measurement result for each item is as listed below, the quality is judged as being acceptable.

IGBT

(flywheel diode)

IGBT

(main element)

Tester polarity

+ (red) − (black)

RB N Conduction

N RB No conduction

Measurement results

4-5

P RB Conduction

RB P No conduction

4-5 Capacitor Life Curve

mbient temperature (°C)

12-hour operation/day

4-5 Capacitor Life Curve

-10 1

Note 1: Ambient temperature refers to the surrounding (atmospheric) temperature of the

Regenerative Braking Unit, or the temperature inside if it’s encased or installed in an enclosure.

Note 2: The smoothing capacitor, which will waste because of the internal chemical reaction,

should normally be replaced once every 5 years. If the ambient temperature is high, however, frequent operation of the Regenerative Braking Unit will cause its service life to be significantly shortened due to capacitor deterioration.

245678910

24-hour operation/day

Capacitor life (year)

Inspection and Maintenance

4-6

4-5 Capacitor Life Curve

Inspection and Maintenance

4-7

Chapter 5

Specifications

5-1 Standard Specification List............................. 5-1

5-2 Dimensional Drawing....................................... 5-5

5-1 Standard Specification List

5Specifications

5-1 Standard Specification List

Models with a Built-in Resistor (3G3AX-RBU21/-RBU22/-RBU41)

Voltage class 3-phase 200 V class 3-phase 400 V class

Model (3G3AX-) RBU21 RBU22 RBU41

Connectable resistance 17 Ω min. 17 Ω min. 34 Ω min.

Operating voltage ON/OFF

(−5 % or −10 % setting available)

Operation indication LED ON (Lit)

Maximum number of units in parallel operation

ON: 362.5 ± 5 V,

OFF: 355 ± 5 V

5 units

ON: 725 ± 5 V,

OFF: 710 ± 5 V (−5 % or −10 %

setting available)

Built-in resistance

Allowable consecutive ON time

Allowable operation cycle

Specifications

Built-in resistor

Power consumption

Built-in resistance overheat protection

Protective functions

Ambient temperature

Ambient storage temperature

Humidity 20 % to 90 % (with no condensation)

Vibration 5.9 m/s

Operating environment

Location At a maximum altitude of 1000m; indoors (without corrosive gases or dust)

120 W 180 Ω 120 W 20 Ω

10s max. 0.5s max. 10s max.

Cycle 1/10

(10s ON/90s OFF)

Instantaneous: 0.73 kW

Short-time rating: 120 W

Built-in relay specifications

• The temperature relay operates if the built-in resistor reaches approx. 200 °C or more, and recovers at approx. 170 °C or less.

• Built-in thermal fuse (recovery impossible)

• Rating of contact 250 V AC 200 mA (R load)

12 V DC 500 mA(R load) 42 V DC 200 mA(R load)

• Minimum load 1 mA

−20 °C to 65 °C (short-time temperature during transport)

Cycle 1/80

(0.5s ON/40s OFF)

Instantaneous: 6.6 kW

Short-time rating: 120 W

−10 °C to 50 °C

(0.6G) 10 to 55 Hz

120 W 180 Ω

x 2 in series

Cycle 1/10

(10s ON/90s OFF)

Instantaneous: 1.46 kW

Short-time rating: 240 W

Paint color Munsell 5Y7/1 (cooling fan: aluminum ground color)

*1. To use the Braking Resistor (3G3AX-RAB/-RBB/-RBC) for the 400-V class Regenerative

Braking Unit, be sure to remove the built-in resistor, and connect two resistors of the same model in series. If the 400-V class Regenerative Braking Unit is operated with a single Braking Resistor, the Braking Resistor may be damaged.

*2. Set the DIP switches.

5-1

5-1 Standard Specification List

*3. The built-in resistor has a thermal fuse.

If the alarm terminal is not connected, the fuse may blow out in order to prevent the resistor from burning due to overheating. If the fuse blows out, the built-in resistor must be replaced.

Specifications

5-2

5-1 Standard Specification List

Models without a Built-in Resistor (3G3AX-RBU23/-RBU24/-RBU42/RBU43)

Voltage class 3-phase 200-V class 3-phase 400-V class

Model (3G3AX-) RBU23 RBU24 RBU42

Continuous operation

6 Ω min. 4 Ω min. 24 Ω min. 12 Ω min.

RBU43

Short-time operation/ Allowable operation cycle / Allowable continuous ON time

Specifications

Connectable resistance

Operating voltage ON/OFF

Operation indication LED ON (Lit)

Maximum number of units in parallel operation

Built-in power module overheat protection

Protective functions

Ambient temperature

Ambient storage temperature

4 Ω min.

Cycle 1/5

(2 min ON/

8 min OFF)

2 min

ON: 362.5 ± 5 V, OFF: 355 ± 5 V

(−5 % or −10 % setting available)

Built-in relay specifications

• The temperature relay operates if the cooling fin reaches approx. 100°C or more.

• Rating of contact 240 V AC 3 A (R load)

• Minimum load 5 V DC 50 mA (R load)

−20 °C to 65 °C (short-time temperature during transport)

2 Ω min.

Cycle 1/5

(2 min ON/

8 min OFF)

2 min

2 units

36 V DC 2 A(R load)

−10 °C to 50 °C

10 Ω min.

Cycle 1/10

(10 s ON/

90 s OFF)

10 s

ON: 725 ± 5 V, OFF: 710 ± 5 V

(−5 % or −10 % setting available)

6 Ω min.

Cycle 1/5

(2 min ON/

8 min OFF)

2 min

Humidity 20 % to 90 % (with no condensation)

Vibration 4.9 m/s

Location At a maximum altitude of 1000m; indoors (without corrosive gases or dust)

Operating environment

Paint color Munsell 5Y7/1 (cooling fan: aluminum ground color)

(0.5G) 10 to 55 Hz

*1. To use the Braking Resistor (3G3AX-RAB/-RBB/-RBC) for the 400-V class Regenerative

Braking Unit, be sure to connect two resistors of the same model in series. If the 400-V class Regenerative Braking Unit is operated with a single Braking Resistor, the Braking Resistor may be damaged.

*2. Set the DIP switches.

5-3

5-1 Standard Specification List

Specifications of Braking Resistors (3G3AX-RBA/-RBB/-RBC)

Model

Resistance (Ω) 180 100 50 35 180 100 50 35 50 35 17

Capacity (W) 120 200 300 400 400 600 1200

Allowable braking frequency (%ED)

Allowable continuous braking time(s)

1201 1202 1203 1204 2001 2002 3001 4001 4001 6001

5 2.5 1.5 1.0 10 7.5 7.5 7 10

20 12 5 3 30 20 10

3G3AX-RBA 3G3AX-RBB 3G3AX-RBC

12001

Specifications

5-4

5-2 Dimensional Drawing

3G3AX-RBU21/-RBU22/-RBU41

Specifications

3G3AX-RBU23

2-φ5

208

218

Ground terminal Screw size : M5

145

100

217

237 258

258

4-φ8

16045

250

Ground terminal Screw size : M5

151

109

5-5

3G3AX-RBU24

5-2 Dimensional Drawing

234

254

275

4-φ8

20050

300

Ground terminal Screw size : M5

171

101

127

Specifications

3G3AX-RBU42

2-φ5

5208

218

Ground terminal Screw size : M5

145

100

5-6

5-2 Dimensional Drawing

3G3AX-RBU43

217

237 258

258

4-φ8

250

16045

Ground terminal Screw size : M5

151

109

Specifications

5-7

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15. Indemnities their employees from and against all liabilities, losses, claims, costs and expenses (including attorney's fees and expenses) related to any claim, investigation, litigation or proceeding (whether or not Omron is a party) which arises or is alleged to arise from Buyer's acts or omissions under these Terms or in any way with respect to the Products. Without limiting the foregoing, Buyer (at its own expense) shall indemnify and hold harmless Omron and defend or settle any action brought against such Companies to the extent based on a claim that any Product made to Buyer specifications infringed intellectual property rights of another party.

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. Buyer shall indemnify and hold harmless Omron Companies and

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. (a) Waiver. No failure or delay by Omron in exercising any right

” means “including without limitation”; and “Omron Compa-

or contact your Omron representative for pub-

. OMRON COMPANIES SHALL NOT BE LIABLE

Any intellectual property in the Products is the exclu-

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These Terms are governed by the

. These Terms constitute the entire agreement between

. Buyer shall have no right to set off any amounts

. Omron’s sole obli-

. If any provi-

. As used

Certain Precautions on Specifications and Use

1. Suitability of Use. Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine, system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases but the following is a non-exhaustive list of applications for which particular attention must be given: (i) Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this document. (ii) Use in consumer products or any use in significant quantities. (iii) Energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles, safety equipment, and installations subject to separate industry or government regulations. (iv) Systems, machines and equipment that could present a risk to life or property. Please know and observe all prohibitions of use applicable to this Product. NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO

ADDRESS THE RISKS, AND THAT THE OMRON’S PRODUCT IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

2. Programmable Products. user’s programming of a programmable Product, or any consequence thereof.

3. Performance Data and other materials is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate it to actual application requirements. Actual perfor mance is subject to the Omron’s Warranty and Limitations of Liability.

4. Change in Specifications changed at any time based on improvements and other reasons. It is our practice to change part numbers when published ratings or features are changed, or when significant construction changes are made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at any time to confirm actual specifications of purchased Product.

5. Errors and Omissions. checked and is believed to be accurate; however, no responsibility is assumed for clerical, typographical or proofreading errors or omissions.

Omron Companies shall not be responsible for the

. Data presented in Omron Company websites, catalogs

. Product specifications and accessories may be

Information presented by Omron Companies has been

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I563-E1-01

OMRON 3G3AX-RBU User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Read and Understand This Manual

Warranty and Limitations of Liability

Application Considerations

Disclaimers

Safety Precautions

Precautions for Safe Use

Precautions for Correct Use

Checking Before Unpacking

Revision History

About This Manual

Contents

1-1 Wiring

1-2 Terminals

Terminal Position and Arrangement

Terminal Description

1-3 Removing the Built-in Resistor

1-4 Connection

3G3AX-RBU21/-RBU22 Connection Example

3G3AX-RBU41 Connection example

3G3AX-RBU23/-RBU24 Connection Example

3G3AX-RBU42/-RBU43 Connection Example

2-1 DIP Switch Setting

Operating voltage level setting (SW1, SW2)

Parallel operation settings (SW3, SW4)

3-1 Precautions before Operation

3-2 When the Alarm Contact is Activated

3-3 When an Inverter Overvoltage Trip Occurs

4-1 Inspection and Maintenance

Daily Inspection

Cleaning

Periodic Inspection

4-2 Daily Inspection and Periodic Inspection

4-3 Megger Test

4-4 Checking the Main Element

Preparation

Checking method

4-5 Capacitor Life Curve

5-1 Standard Specification List

Models with a Built-in Resistor (3G3AX-RBU21/-RBU22/-RBU41)

5-2 Dimensional Drawing

3G3AX-RBU21/-RBU22/-RBU41

3G3AX-RBU23

3G3AX-RBU24

3G3AX-RBU42

3G3AX-RBU43