ST500 | Parameterisation example: External potentiometer, switch ON/OFF and change of direction

This example describes the operation of a three-phase motor with a Sourcetronic frequency inverter of the ST500 series. The speed (frequency) is to be controlled via an external potentiometer. The motor is to be started and the direction of rotation changed via two simple switches.

The connections required for this example:

The potentiometer (1 to 5 kΩ, 2 watts) is connected to the green control terminal strip. The potentiometer has three connections, the left one is connected to the +10V terminal, the middle one to terminal AI1 and the right one to terminal GND. Jumper J3 must remain in the factory setting position 2-3 (voltage measurement).

The first switch, which is to start the motor, is connected to terminals DI1 and COM. The second switch, which is to change the direction of rotation, is connected to terminals DI2 and COM. Since all COM have the same potential, they can also be connected to the switches so that only one terminal is occupied.

The parameterisation necessary for this example:

Set F0.03 to the value 2 (control source for main frequency on AI1).
If the value 2 cannot be set, it is already occupied by F0.04 (control source for additional frequency). In some inverter models, this is the factory setting, so F0.04 must first be changed to a different value before F0.03 can be changed to 2.

Set F0.11 to the value 4 (control of the frequency inverter via the control panel and the control terminals is possible).

Set F1.10 to value 1 (terminal mode to two-wire control 2).

Back to the frequency inverter ST500 questions.