Electronic Potentiometer Application (E.p.) - WEG CFW700 Serie Manual Del Usuario

4.2.2 Electronic Potentiometer Application (E.P.)

The CFW700 has the Electronic Potentiometer (E.P.) function that allows the speed reference to
be adjusted via two digital inputs, one for accelerating and another for decelerating the motor.
With the inverter enabled and the DIx digital input set to "Function 1 of the Application
(Accelerate)" activated, the motor is accelerated according to the programmed acceleration
ramp up to the maximum speed. If only the DIx digital input set to "Function 2 of the Application
(Decelerate)" is active and the inverter is enabled, the motor speed is decreased according to
the programmed deceleration ramp up to minimum speed. If both inputs are active, the motor
will decelerate for safety reasons. With the inverter disabled, DIx digital inputs are ignored unless
both are active, which the speed reference is set to 0 rpm. The following figure illustrates this
condition.
Output
speed
DIx Increase
Reset
DIx Decrease
DIx - Run/Stop
Figure 4.5: Operation of the Electronic Potentiometer application (E.P.)
It is necessary to set P0221 or P0222 to 7 = SoftPLC for the operation of the electronic
potentiometer application.
Definitions:
The Function 1 of the Application at P0263 to P0270 represents the Accelerate command.
„
The Function 2 of the Application at P0263 to P0270 represents the Decelerate command.
„
The accelerate command is done by one of the digital inputs (DI1 to DI8). It is necessary to set
one of the DI's parameters (P0263 to P0270) to 20 = Function 1 of the Application.
If more than one digital input is set for this function, the logic operation will consider only the
command of the high priority level digital input, where: DI1>DI2>DI3>DI4>DI5>DI6>DI7>DI8. If
any of the digital inputs is set, the following alarm message will be displayed: "A0750: Set a DI for
Function 1 of the Application (Accelerate)" and the operation of the application will not be enabled.
Increase
Digital
inputs Decrease
Enabling
Minimum
speed
24 V
24 V
Keypad (HMI) and Basic Programming
Aceleration
Deceleration
Reset
&
open
24 V
open
Speed
reference
Time
Time
Time
Time
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