Wizards
Intelligent Operator Panel (IOP)
Operating Instructions, 08/2015, FW V1.6.1, A5E00110011B AF
29
The purpose of this application is to maintain a constant level of fluid in a pumping system
and reacting to maintain the pre-determined level even if fluid is being drawn from the
system.
The analog input is used to set the frequency setpoint.
The closed-loop application allows for the fluid in a tank to be directly monitored using the
PID control function.
At low output frequencies, the V/f characteristics give only a low output voltage. This means
that the output voltage can be too low in order to:
● Implement the magnetization of an induction motor
● to hold the load
● to equalize losses in the system
● to provide a breakaway, acceleration or braking torque.
The output voltage can be increased (boosted) in the Inverter using the boost function.
The Boost settings wizard guide the user through the correct setting of the boost function.
Fixed Closed Loop control is widely used in industrial applications to control a wide variety of
processes. A simple closed-loop control uses a feedback signal from the process (such as,
temperature, pressure and speed) and a desired value or setpoint. The control system
compares the two values and derives an error signal. The error signal is used to control the
Inverter and motor to reduce the error.
The error signal processing can be very complex because of the delays in the system. The
error signal is processed using a Proportional and Integral differential (PID) controller whose
parameters can be adjusted to optimize the performance and stability of the system.
The PID controller wizard guide the user through the PID setting-up process.
This wizard can be used for the typical material handling applications, such as conveyor
belts, roller conveyors and turn-tables.
The sensors are directly connected to the Inverter to allow their individual status to be sent to
the controlling PLC.
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