Consider a pump that runs when powered with 460V 3-phase AC. The pump has a loca

Question

Consider a pump that runs when powered with 460V 3-phase AC. The pump has a local disconnect with a set of auxiliary contacts. On the face of the local disconnect there is a three-position selector switch giving the operator the following operation modes:

1. Hand

2.Off

3. Auto

The definition of each mode is shown below:

Hand – Allows the operator to manually run the pump when needed.

Off – The pump will not run regards of mode.

Auto- The pump can be remotely started from the control room with a PLC computer-interface or a locally mounted push-button panel. Design the logic that provides all of the above functionality.

Explanation / Answer

For The pump to be operated 3 in three different modes I would like to use different LOGIC GATES.

HAND MODE:

OFF MODE:

AUTO MODE:

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