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VIX IM MICROSTEPPER INDEXER DRIVE USER GUIDE
80
Homing Configuration Command
The command allows you to define the mechanical edge of the home switch at which you
wish home to be. The command also allows you a choice of home switch type, that is
normally closed or normally open, however if you change the switch type this does not
change the edge you are homing to. Remember the positive edge is the mechanical edge of
the home switch closest to the positive limit.
Other features of the HOME configuration command allow adjustment of the search speed
and direction, the acceleration or deceleration rate to be used and mode selection. When
setting the deceleration rate you must ensure sufficient distance is left between the home
switch and any limit to make sure motion is brought to a halt after the home switch is
detected and before a limit is reached. If not, the system will be brought to an immediate
halt as soon as the limit is detected.
Mode Selection
Mode selection allows you the choice of how and where motion is brought to a stop within
the home switch operating range. The choices are:
• Mode 0 - the indexer will detect the first edge (positive or negative) and will then
decelerate to rest within the home switch operating range
• Mode 1 - will cause motion to stop at the mechanical edge of your choice (positive or
negative)
• Mode 2 – reserved
• Mode 3 – If an encoder with a Z channel is used then the controller will seek the Z
position after detecting the specified home switch edge.
• Mode 4 – If an encoder with a Z channel is used then the controller will seek the Z
position without the need for a home switch.
Mode 0 operation simply returns the motor to its home position at some point between the
negative edge and positive edge of the home switch. Apart from knowing which edge of the
switch was used the exact position within the home switch range is undefined. A more
precise home position can be obtained by using mode 1.
Mode 1 allows the home position to be defined as either the positive or negative edge of the
home switch. Note, although mode 1 fixes the home position at one of two edges the
precise position is still subject to the repeatability of the home switch itself. Practical
applications will exhibit variations in switch performance and consequently the home position
will still be subject to variation by a small number of motor steps.
Mode 2 Reserved.
Modes 3 & 4 for use with Z channel encoders.