3–5

SJ300 Inverter

Operational Modes

The RUN and PGM LEDs tell just part of the story; Run Mode and Program Modes are independent modes, not opposite modes. In the state diagram to the right, Run alternates with Stop, and Program Mode alternates with Monitor Mode. This is a very important ability, for it shows that a technician can approach a running machine and change some parameters without shutting down the machine.

 

STOP

 

Run

RESET

Stop

 

 

 

RUN

FUNC.

Monitor Program

The occurrence of a fault during operation will cause the inverter to enter the Trip Mode as shown. An event such as an output overload will cause the inverter to exit the Run Mode and turn OFF its output to the motor. In the Trip Mode, any request

STOP

RESET

RunStop

RUN

to run the motor is ignored. You must clear the error by pressing the Stop/Reset switch. See

Fault

STOP

RESET

Run Mode Edits The inverter can be in Run Mode (inverter output is controlling motor) and still allow you to edit certain parameters. This is useful in applications that must run continuously, yet need some inverter parameter adjustment.

The parameter tables in this chapter have a column titled “Run Mode

 

 

Run

 

Edit.” An Ex mark ✘ means the parameter cannot be edited; a Check

 

mark ✔ means the parameter can be edited. You’ll notice in the table

Mode

 

example to the right the two adjacent marks: “✘ ✔”. The two marks

Edit

 

(that can also be “✘ ✘” or “✔ ✔”) correspond to these levels of access

Lo Hi

 

 

 

to editing:

✘ ✔

 

 

 

•Low-access level to Run Mode edits (indicated by left-mostmark)

•High-access level to Run Mode edits (indicated by right-mostmark)

The Software Lock Setting (parameter B031) determines the particular access level that is in effect during Run Mode and access in other conditions, as well. It is the responsibility of the user to choose a useful and safe software lock setting for the inverter operating conditions and personnel. Please refer to “Software Lock Mode” on page 3–36 for more information.

Parameters

Drive Configuring

Control Algorithms

The motor control program in the SJ300 inverter has several sinusoidal PWM switching algorithms. The intent is that you select the best algorithm for the motor characteristics in your application. Each algorithm generates the frequency output in a unique way. Once configured, the algorithm is the basis for other parameter settings as well (see “Torque Control Algorithms” on page 3–14). Therefore, choose the best algorithm early in your application design process.

Inverter Control Algorithms

V/f control, constant torque

V/f control,

variable torque

V/f control, free-

setting curve

Output

Sensorless vector

(SLV) control

SLV control, 0Hz domain

Vector control with sensor