[Nick345]

Hi，
A customers CNC router with 2 MA860H drivers(Leadshine Technology Co., Ltd.).
At First,All axis drive/move correctly, however when the Z and A (rotational) axis are connected (even when not in use)
there is a large amount of "noise" generated that affects the NPN type homing switches.
When these 2 units are switched off/disconnected from the supply the homing switches work correctly.
How is that happened?

[allen2080]

Hi Nick,

Can you show me wiring diagram of the whole CNC router?
NPN homeing switch should have an independent power supply. If it share a same power supply with the Leadshine MA860H or other drives. It wll be interfered.
Further more, if this problem still can not be handled. You can try to use a shield motor cable. And make sure the motor house grounding. NPN homing switch also need adopt shield signal cable.
Thanks.