R201 Automatic Voltage Regulator

About this part

An AVR senses the alternator's output voltage and adjusts the current in the exciter field many times a second to hold it at the set point. Without it, voltage swings with every change in load and can damage connected equipment.

Features

• 1 phase 240 VAC ± 10%,
• 380 V at 480 VAC ± 10% for three-phase 2-wire detection

When to replace it

• Output voltage that is too high, too low or unstable
• No output voltage although the engine runs normally
• Lights flickering or voltage dipping as loads switch on
• A burnt or damaged board after a lightning strike or short

Before you order

Set the voltage and stability adjustments with the generator off load first, then check the response with a load applied.

Match the number stamped on the part you are removing, or the number in your engine or alternator manual, before ordering. Part numbers are shown for reference so the right replacement can be identified.

Questions