Sequential Motor Control Circuit Using Delta – DVP-14SS PLC

How to Run Three Phase Motors in Sequence Using DVP-14SS PLC?

In industrial automation and applications, it is common to have multiple three-phase electric motors that need to be controlled in a sequential manner. The Delta DVP-14SS PLC (Programmable Logic Controller) offers a reliable and efficient solution for implementing automatic sequential motor control circuits. In this article, we will explore how to run three-phase motors in sequence automatically using the Delta DVP-14SS PLC.

Circuit of Sequential Motor Control

To control three-phase motors in sequence automatically, we need a control circuit that can handle multiple motor outputs and provide the necessary timing and coordination. The Delta DVP-14SS PLC is well-suited for this task, offering multiple digital output channels and advanced programming capabilities.

Hardware & Components Required

To implement the automatic sequential motor control circuit, the following hardware components are required:

• Delta DVP-14SS PLC unit (or DVP-SS2 Series)
• 3-phase motors
• Contactors
• MCBs and MCCBs
• Auxiliary relays (if needed)
• AC (3-Phase, 415V, & 1-Phase, 230V 1-Phase) & 24V DC Supply
• Start and Stop pushbuttons

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Circuit Diagrams

The circuit diagram for the automatic sequential motor control circuit using the Delta DVP-14SS PLC is as follows:

Wiring & Power Diagram

Basic Diagram

Click image to enlarge

Wiring for Automatic Operation using Relays

Click image to enlarge

Control Diagrams

Ladder Logic Diagram

Here is an example ladder logic program that demonstrates automatic sequential motor control using the Delta DVP-14SS PLC:

Basic Operation

Advance Operation

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Programming the Delta DVP-14SS PLC for Sequential Operation of Motors

To program the Delta DVP-14SS PLC for automatic sequential motor control, we can use Delta’s programming software, such as WPLSoft (or ISPSoft). The following steps outline the programming process:

1. Connect the Delta DVP-14SS PLC unit to your computer using the appropriate communication cable.
2. Launch the WPLSoft programming software and create a new project.
3. Configure the PLC settings, such as the communication parameters and I/O configuration, to match your hardware setup.
4. Create a new ladder logic program in the project.
5. Begin by adding a network to read the input for motor sequence control. In this example, we will use input as X0, X1, X2 etc.
6. Add a coil in the network to control the output for three motors. Use output Y0, Y1 and Y2 etc for this purpose as shown in ladder diagrams.
7. Write the necessary ladder logic instructions to control the motor output based on the input condition. For automatic sequential control, you may utilize timers, counters, and logical instructions to implement the desired logic.
8. Repeat the above steps for each motor in the sequence, creating separate networks for each motor control output.
9. Once the ladder logic program is complete, compile it and check for any errors.
10. Download the program to the Delta DVP-14SS PLC unit.
11. Test the automatic sequential motor control circuit by powering up the PLC and observing the motor operation according to the programmed logic.

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