What is the humming / buzzing noise coming from the ROTOR(+) during pinning?

Answer : This is perfectly normal and it is unlikely that there is a fault with the ROTOR(+). Please see the video below for an example of the noise during normal operation.

What causes it?

The noise heard is coming from what is called an ITV pressure regulator.

The tone changes as it increases and decreases the pinning pressure at the gripper head. The pressures are constantly changing depending on what the ROTOR(+) is doing. Pressures are set as a percentage (%) of full pressure.

As the ROTOR(+) moves around a default pressure of 40% is used. When it is pinning this pressure increases / decreases depending on the settings in the software. Once it has finished pinning it returns to 40% before moving again.   

If it is louder than noticed before it is possible that the sound-deadening sponge material used to hold it in place has relaxed a little and the regulator may be moving very slightly in its holder. It will be louder at the rear of the ROTOR(+) at the left-hand end (air supply input end). See the photo below for the ITV location.

How do I know if it is faulty?

• There is little / no pressure being applied to the plate.
• There is too much pressure being applied to the plate.
• Changes to the Pinning Pressure settings in Source and Target do not appear to be affecting the actual pinning pressure
• There is no light visible on the ITV unit. (See the photo above)
• The hardware crashes when the ROTOR is moving around.
  • This is quite easy to check. After initialising the ROTOR lift the front plastic screen. Place the palm of the hand under the gripper head and gently try to lift it a few millimetres. There should be resistance. If there is no resistance check the light on the ITV unit shown in the picture above.

For all of these faults please contact Singer Instruments for advice.

If you require more information please contact [e-mail] for assistance.