connect 6008 gnd to ac neutral?

Hello

I want to control an actuator that has a 3-wire interface: 24 V AC for power, 0-5 V DC for control and common.

For this, I have a voltage of 230 V to 24 V AC transformer and case NI USB-6008.

Now, first of all I'm not sure if I can simply connect the gnd 6008 (and other gnds DC of the system) to the neutral AC?

Second, it must be delivered to a customer, so I can't be sure if they connect the neutral AC and the correct line to 100%. What happens if they are reversed - and y at - it a way to protect the circuit, perhaps so that the system is not running if not connected properly?

Thank you, Jan

Jan,

The information provided is very useful.

The reason for my questions on the actuator is that I feared that the power to make the maneuver could result in some sort of interference on the side of the control.  This can sometimes happen with important relays and contactors for example. It shouldn't be a problem with your device.

On the third page of the transformer specification is a diagram that shows no link between primary and secondary windings.  That's what I called isolation.  An "isolation transformer" defined charactersitics about insulation between primary and secondary resistance and capacitive often additional shielding to minimize the coupling between the windings.  This degree of isolation is not necessary here.  With the transformer, you have 24V circuit is not connected to the power circuit.

I would say just a connection between the USB-6008 ground and connection to the Earth. Tensions on the measurement system which will prevent from becoming dangerous.  Using only a single connection to the Earth, without current loops carriers are created. If the power supply for laptop has a grounded outlet, check if it is connected to the USB mass. If so, that's the connection.  If not add a ground wire.

Lynn

Tags: NI Hardware

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