Incorrect placement of the ferrite filter or incorrect ferrite filters can result in the control reading the Z-pulse as 2 or 3 different pulses or none. This causes the control to think the communication between the spindle encoder and processor has been lost, making the machine to alarm.
Top image show the correct installation of the ferrite filters on the vector drive:
One ferrite filter on the Black and White cables from the Regen terminals 1 and 2 with one large ferrite filter on the motor leads at terminals 9, 10 and 11. making sure ground in out side of the Ferrite filter.
Lower image show two examples of incorrect installation of ferrite filters;
image 1 : Large ferrite filter over motor leads at terminals 9, 10 and 11. with no ferrite filter on the regen cable at terminals 1 and 2
Image 2: No ferrite filter on the regen cable at terminals 1 and 2 and three small ferrite filters on the motor leads at terminals 9, 10 and 11.