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Proper use and handling of the product will ensure proper product performance, will length product life, and may prevent possible accidents. Please read this manual thoroughly and handle and operate the product with care. Table of Contents Chapter 1. Items to be Checked when Unpacking Should you find any problems with the product, immediately contact your nearest local sales representative.

Chapter 1 Getting Started If an inspection or some other task is to be performed, always wait at least one minute from the time all indicators on the front panel go off. Note that this warning is applicable whenever you perform any task after turning the main circuit off. Therefore, constant numbers can be confirmed easily. D Minimum Constant Setting Items Constant setting items have been minimized to enable even first-time users to set constants easily.

D Separate Input and Output Terminal Blocks Power input terminals are located in the upper section, while motor output terminals are in the lower section. Chapter 2 Overview H Digital Operator Data display section Monitor item indicators In-service item indicators green indicators Display These items can be monitored or set even section during operation. Stopped item indicators red indicators These items can be set only when the Inverter is stopped. Alternatively, install it in a totally enclosed panel that is completely shielded from suspended dust.

Chapter 3 Design Note 1. For the 3-wire sequence, refer to the wiring on page Line voltage drop V is calculated as follows: Chapter 3 Design D Installing an AC Reactor If the Inverter is connected to a large-capacity power transformer kW or more or the phase advance capacitor is switched, an excessive peak current may flow through the input power circuit, causing the converter unit to break down. To prevent this, install an optional AC reactor on the input side of the Inverter.

Other controllers Note Use a special-purpose noise filter for Inverters.

If voltage is applied to the output terminals, the internal mechanism of the Inverter will be damaged. D Never Short or Ground the Output Terminals Caution If the output terminals are touched with bare hands or the output wires come into contact with the Inverter casing, an electric shock or grounding will occur. Chapter 3 Design Induction Noise: Electromagnetic induction generates noise on the signal line, causing the controller to malfunction. Electromagnetic waves from the Inverter and cables cause the broadcasting radio receiver to make noise.

D How to Prevent Induction Noise As described above, a noise filter can be used to prevent induction noise from being generated on the output side. Chapter 3 Design D Cable Length between Inverter and Motor If the cable between the Inverter and the motor is long, the high-frequency leakage cur- rent will increase, causing the Inverter output current to increase as well.


This may affect peripheral devices. Chapter 3 Design Wiring Control Circuit Terminals The control signal line must be 50 m or less and must be separated from the power line. If frequency references are input externally, use a twisted- pair shielded line. Chapter 3 Design D Wires to be Used Always use twisted-pair shielded wires to prevent malfunctions due to noise. Wire type Wire size Wire to be used Single wire 0.


Chapter 4 Preparing for Operation Preparation Procedure 1. Install the Inverter according to installation conditions. Refer to page Check that all the installation conditions are met. Connect the Inverter to power supply and peripheral devices. Refer to page Select peripheral devices that meet the specifications, and wire them correctly. Chapter 4 Preparing for Operation 6. Perform a no-load test run and an actual loading test run to check that the motor and peripheral devices operate normally.

Refer to page Check the direction of motor rotation and check that the limit switches operate nor- mally. Chapter 4 Preparing for Operation H Function of Each Component D Display Sections Data display section Reference frequency values, output frequency values, output current values, constant settings, and error codes are displayed. Monitor item indicators When this indicator is lit, an output frequency value Hz is displayed in the data display section.

During operation, only the items in the in-service item indicators section can be monitored and the constants for these items can be set. When the Inverter is stopped, all items can be monitored and the constant for each item can be set. Chapter 4 Preparing for Operation H Monitor Display The 3G3EV allows the user to monitor the reference frequency, output fre- quency, output current, and the direction of rotation.

The constants for basic operations are allocated to dedicated indicators, so the user need not refer to the constant nos. The constants allocated to dedicated indicators can be also set by lighting the PRGM indicator. Changing the value of constant no. Chapter 4 Preparing for Operation Note 3. Displaying the constant no. Chapter 4 Preparing for Operation Note 2. The DIP switch is located inside the Inverter.

Use this switch to change the set- ting when frequency references are to be input in terms of amperage 4 to 20 mA. Value Description Forward rotation Chapter 4 Preparing for Operation Note MA is turned on when the difference between the reference frequency and the output frequency falls within 2 Hz. Chapter 4 Preparing for Operation Operation after Recovery from Power Interruption Setting range 0, 1, 2 Factory setting 0 This constant is used to select the processing to be performed after recovery from an instantaneous power interruption.

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Value Description Discontinues operation. Continues operation only if power interruption is within 0. Warning automatically recovered error is not recorded.

Error code Description Error category Chapter 4 Preparing for Operation Test Run After wiring is complete, perform a test run of the Inverter as follows.

First, start the motor through the Digital Operator without connecting the motor to the mechanical system. Next, connect the motor to the mechanical sys- tem and perform a test run. The RUN and ALARM indicators on the front panel indicate the current Inverter sta- tus, and the data display section also displays information about an error that has occurred. The data display section also flashes. When warning status arises, no error code is output. Eliminating the cause recovers the system automatically.


In this event, Inverter output is shut off, and the motor coasts to a stop. Check the cause of the error, take the necessary action, and perform fault reset or turn the power off, then on.

The DC voltage of the main circuit dropped below the specified level. Approximately V occurred. Howev- er, all indicators are not lit when a control circuit error occurs. If an Inverter error occurs, turn the power off, then on. Chapter 5 Operation Troubleshooting If the Inverter or motor does not operate properly when the system is started, constant settings or wiring may be incorrect. In this case, take the appropriate action as described below. If an error code is displayed, refer to Protective and Diagnostic Functions.

When the reference frequency is less than 1. Change the reference frequency to 1. If the 3-wire sequence input mode is selected as an external terminal function instead of the actual 2-wire sequence input mode, the motor will not run, in which case change the constant or change to the sequence input that matches the constant setting. Chapter 5 Operation To reverse the direction of rotation, switch the wires of two phases of U, V, and W as shown below. Surge arises when the motor inductive load is connected to the output side of the Inverter.

Normally, the maximum surge voltage is approximately three times the power voltage. Chapter 5 Operation S Install an input noise filter.

S Install an output noise filter. S Use metal box and piping. Chapter 5 Operation Under the wiring condition shown below, if the control output power supply is lower than 24 VDC or if it is set to OFF, current may flow in the direction shown by the arrows and may operate the Inverter input. In such a case, insert a diode in the A section shown below.

Before starting inspection, always turn the power off, then wait at least one minute after all indicators on the front panel go off. Touching terminals immediately after turning the power off may cause an electrical shock. Stops the system when voltage drops below approximately V In addition, cooling effects also decline in the low-speed range, resulting in an increase in the motor temperature.

When the motor is operated with this Inverter, motor vibration is almost the same as when op- erated with a commercial power supply. However, motor vibration may become greater in the following cases: Chapter 7 Appendix A D Gearmotor The speed range for continuous operation differs according to the lubrication method and motor manufacturer.

In particular, continuous operation of an oil-lubricated motor in the low speed range may result in burning. If the motor is to be operated at a speed high- er than 60 Hz, consult with the manufacturer.

Chapter 7 Appendix A 3. Removing the Digital Operator S Insert a finger in the recessed section below the Digital Operator, then lift the under- neath of the Digital Operator. S When the connector comes off, grip the lower edges of the Digital Operator, and slide it down until it comes off.

Amperage input DIP switch 5.