Normally, it is hard to turn the wheel or roller of the rotary attachment if it is energized. 

If it can be easily turned, then the attachment might be faulty or it is not energized, meaning its driver or power supply is malfunctioning.

Follow the steps below to check the status of the drive unit of the rotary attachment. If the drive unit proves normal, the problem lies with the rotary attachment perse and you might need to contact its dealer.  

To check the drive unit,

1. Remove the bottom plate to expose the drive unit for the rotary attachment.
2. Check whether the drive unit is energized, which is indicated by the lit green light (as shown)

If the light is lit,

1. Remove the motor plug from the drive unit.
2. Measure the conductivity between ports A+ and A-, and that between ports B+ and B-.

        Normally, A+ and A- are conductive, and so are B+ and B-, but NOT an A and a B port. 

If the drive unit has tested normal, then the problem lies with the rotary attachment and you might need to contact its dealer.  

If the rotary attachment cannot be easily turned, it is energized. Use the steps below to troubleshoot.

1. Enable the rotary attachment in your control software. 
2. Check if the rotary attachment is reacting.
3. If the rotary attachment is jittering, or jarring, remove the bottom panel to expose its drive unit. 
4. Check the status of the light in the drive unit.

• If it is glowing green, 

1. Remove the motor plug from the drive unit.
2. Measure the conductivity between ports A+ and A-, and that between ports B+ and B-.

        Normally, A+ and A- are conductive, and so are B+ and B-, but NOT an A and a B port. 

If the drive unit has tested normal, the problem lies with the rotary attachment per se and you might need to contact its dealer.  

• If it is glowing red,

1. Measure the voltage of the drive unit(as shown). The normal reading is 24V.
2. If the voltage reads different remove the power input plug of the drive unit.
3. Measure the voltage of the removed plug.

• If it reads 24V, the drive unit is faulty; replace it with a new, identical one. 
• If it still reads abnormal, the 24V power supply is faulty; replace the components involved.