3–5

L2002 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.

 

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.

Run

An event such as an output overload will cause the

 

inverter to exit the Run Mode and turn OFF its

Fault

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

RESET

Stop

RUN

STOP

RESET

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.

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 table example to the right contains two adjacent marks

 

 

 

Lo Hi

 

“✘ ✔”. These two marks (that can also be“✘ ✘” or “✔ ✔”)

 

✘ ✔

 

correspond to low-access or high-access levels to Run Mode

 

 

 

 

 

edits (note Lo and Hi in column heading).

 

 

 

The Software Lock Setting (parameter B031) determines when Run Mode access 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 3–39.

Parameters Drive

Configuring

 

 

Control Algorithms

The motor control program in the L2002 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 3–18). 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