Conveyor Safety

In normal operation, fluid coupling transmits power from pump vane to turbine vane.
When the conveyor is running reverse in absence of hold back damaged/failed, both pump and turbine vane tries to transmit power from one to another.
In this condition, the total power handled by the fluid coupling becomes double than the designed power rating of the fluid coupling, which makes the fluid coupling to blast. So we have to avoid the above situation.

When the conveyor is running reverse in absence of hold back damaged/failed and though motor is in off condition, the speed sensor ( also known as Zero Speed Switch - ZSS ) may be picking up. In this case it should not allow the motor to get the start command. Accordingly the control wiring / PLC ( programmable logic control ) should be designed.

This will not allow the motor to get energized. By this way, we may not able to meet the functioning of hold back requirements.
But at least avoid such big break downs happening, since pump vane is not getting power. This will ensure that the power handled by fluid coupling will never exceed its rated capacity.

Please let me know if the above is feasible.