4–2

Introduction

Introduction

Operations and Monitoring

The previous material in Chapter 3 gave a reference listing of all the programmable functions of the inverter. We suggest that you first scan through the listing of inverter functions to gain a general familiarity. This chapter will build on that knowledge in the following ways:

1.Related functions – Some parameters interact with or depend on the settings in other functions. This chapter lists “required settings” for a programmable function to serve as a cross-reference and an aid in showing how functions interact.

2.Intelligent terminals – Some functions rely on an input signal from control logic terminals or generate output signals in other cases.

3.Electrical interfaces – This chapter shows how to make connections between the inverter and other electrical devices.

4.Auto-tuning– The SJ300 inverter has the ability to run a calibration procedure in which it takes measurements of the motor’s electrical characteristics. This chapter shows how to run the auto-tuning procedure to help the inverter run the motor more smoothly and efficiently.

5.PID Loop Operation – The SJ300 has a built-in PID loop that calculates the optimal inverter output frequency to control an external process. This chapter shows the parameters and input/output terminals associated with PID loop operation.

6.Multiple motors – A single SJ300 inverter may be used with two or more motors in some types of applications. This chapter shows the electrical connections and inverter parameters involved in multiple-motor applications.

 

 

 

The topics in this chapter can help you decide the features that are important to your applica-

 

 

 

tion, and how to use them. The basic installation covered in Chapter 2 concluded with the

 

 

 

powerup test and running the motor. Now, this chapter starts from that point and shows how to

 

 

 

make the inverter part of a larger control or automation system.

Cautions for

Before continuing, please read the following Caution messages.

Operating

 

Procedures

 

 

 

 

 

 

 

 

CAUTION: The heat sink fins will have a high temperature. Be careful not to touch them.

 

 

 

Otherwise, there is the danger of getting burned.

 

 

 

 

 

 

 

 

 

 

 

CAUTION: The operation of the inverter can be easily changed from low speed to high speed.

 

 

 

Be sure check the capability and limitations of the motor and machine before operating the

 

 

 

inverter. Otherwise, it may cause injury to personnel.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAUTION: If you operate a motor at a frequency higher than the inverter standard default

 

 

 

setting (50Hz/60Hz), be sure to check the motor and machine specifications with the respective

 

 

 

manufacturer. Only operate the motor at elevated frequencies after getting their approval.

 

 

 

 

 

 

Otherwise, there is the danger of equipment damage.