ABB PFSK144 PFSK 144 Channel contact card

HOM connected to GND (normally-open switch). The home limit input is used during a homing move, which is initiated with the HOM command. After initiating the homing move, the controller waits for the home switch to close, indicating that the load has reached the “home” reference position. The active level (default is active low) can be changed with the HOMLVL command. You can also use an encoder’s Z channel pulse, in conjunction with the home switch, to determine the home position (this feature is enabled with the HOMZ1 command).

POS & NEG connected to GND (normally-closed switches). 

Mount each switch such that the load forces it to open before it reaches the physical travel limit (leave enough room for the load to stop). When the load opens the switch, the axis stops at the decel value set with the LHAD command. The motor will not be able to move in that same direction until you execute a move in the opposite direction and clear the limit by closing the switch (or you can disable the limits with the LHØ command, but this is recommended only if the motor is not coupled to the load). The active level (default is active low) can be changed with the LHLVL command.

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