3–5

L200 Inverter

Operational Modes

The RUN and PRG 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.

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 to run the motor is ignored. You must clear the error by pressing the Stop/Reset switch. See “Monitoring Trip Events, History, & Conditions” on page 6–5.

 

STOP

 

 

Run

RESET

 

Stop

 

RUN

 

 

 

FUNC.

Monitor Program

STOP

RESET

RunStop

RUN

STOP

FaultRESET

Trip Fault

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

 

 

 

 

Run

 

Mode Edit.” An Ex mark ✘ means the parameter cannot be

 

 

 

Mode

 

edited; a Check mark ✔ means the parameter can be edited.

 

 

 

Edit

 

The Software Lock Setting (parameter B031) determines when

 

 

 

 

 

 

✘

 

the Run Mode access permission is in effect and access

 

 

 

 

 

 

✔

 

permission 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 3–35 for more information.

 

 

 

Parameters Drive

Configuring

 

 

Control Algorithms

The motor control program in the L200 inverter has two sinusoidal PWM switching algorithms. The intent is that you select the best algorithm for the motor characteristics in your application. Both algorithms generate 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 3–17). Therefore, choose the best algorithm early in your application design process.

Inverter Control Algorithms

Variable freq. control,

constant torque

Output

Variable freq. control,

reduced torque