General - FULL WAVE / HALF WAVE RECTIFIED

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The

type of power supply used on a device affects the way power is

wired to the device.

A half-wave device has ground referenced power circuitry. This

means that all half-wave devices share a common ground.

The power circuitry of a full wave device is not ground

referenced. Full wave devices must use dedicated transformers.

Carefully identify the type of power supply used in a device, as

failing to do so can damage the device and the transformer.

 

Identifying the Type of Supply

It is essential to identify the type of power supply before wiring

power to a device. There are two types of power supplies: halfwave and full wave (full wave is also known as bridge rectified).

Identifying the type of power supply can prevent many

potential problems.

The type of power supply a device uses can be easily

determined by the labeling of the power port. If the power port

is labeled “24~ GND”, then the device uses a half-wave

rectifier. If the port is labeled “24~ 24~”, then the device uses

full wave rectification.

 

Half-Wave

A half-wave rectified signal draws current only from the positive

half of the AC signal. Because of this, devices that use halfwave rectification are ground referenced.

Half-wave devices can be wired from the same transformer,

providing that wire polarity is observed. Crossing wires between

panels can quickly damage both devices and transformers.

 

 

Full Wave

Also known as bridge rectified, a full wave rectified signal draws

current from both the positive and negative voltage cycles. Full

wave devices have floating power supplies and are not

referenced to ground.

Full wave devices cannot be wired to the same transformer to

which a half-wave device is connected. Wiring devices in this

manner will create a ground loop and will damage both the

device and the transformer.

Full wave devices must use a dedicated transformer. Do not

wire other devices to the same transformer. Doing so will

damage both the device and the transformer.

Do not ground the transformer of a full wave device.

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