How do I get anti-ragging on an existing Star Delta starter?
The Deragger II® is simple to integrate into any existing starter sections. In this entry we will be demonstrating the integration of the Deragger II® into Star/Delta starters. This will demonstrate how you can get anti-ragging the easy way. Our slimline device (45mm) is perfect when space is a premium and with its patented clean technology, is the perfect solution for this type of problem.
The device takes a run signal to start. This is taken from the A1-A2 coil of the existing main contactor. Remove the wires from the existing contactor and put them in the common and Input 1 on the Deragger II®. A volt free contact from the reset push button is wired into Input 3.
The Deragger II®’s patented anti-ragging technology relies on a reversing contactor to assist with the cleaning operation of three phase pumps. For retro fit purposes we recommend fitting a forward and reverse contactor. These are placed upstream of the 3 existing contactors. We recommend Schneider contactors due to the slim profile.
The contactors are connected as shown below:
Use the N/O contacts of the forward and reverse contactors in parallel to energise the existing line contactor. This ensures the correct timing of the star/delta change over is maintained.
Next the overload is removed and the existing fault wires (N/O, N/C) are wire into output 3 and 4 of the Deragger II®. This is how to interface the unit with the panel’s trip circuitry and any telemetry that may be present.
The unit is now installed and ready to commission.
