Operations and Maintenance Manual Troubleshooting
Version 1.2 - June 2004 14 - 5
WORK AND SPIN CHUCK HOMING HARDWARE
The home (index) position for the work and spin chucks is only set when a "Home
All" function is performed in the Home Screen. The spin chuck uses home index
hardware (sensors) that will index the chuck in the same place in all cases. The work
chucks will check for a home index and use this for a reference, if the OPTIONAL
hardware is installed on the machine. If the hardware is not detected, the chuck will
be left in the same position as it entered the Home Screen and this will be used as the
home position.
A "Rotational Home" or "Spin Station Home" fault can be caused if the sensor is not
detected and any offset is requested (indicating that hardware is installed) or if there
was a problem positioning the servo to a requested position. Correct the problem and
do another "Home All" to clear the fault. The spin station must index and home
correctly to clear the fault. The work chucks, however can operate without the
hardware by disconnecting the sensor and setting the Machine Variables 10 and 11 to
0.0, as outlined above. On installation, the PC-DSP card must have been loaded with
the configuration that supports this function. Also, jumpers must be installed on the
PC-DSP card grounding the home input signals from the work and spin chucks.
If the hardware for home indexing is not installed, the Machine Variables LT Chuck
Home Offset (variable 10) and RT Chuck Home Offset (variable 11) should be set
to 0.0, which is the default value. Setting these variables to values other than 0.0
without the indexing hardware installed will result in a "Rotational Home" Fault.
Refer to the Work and Spin Chuck Home Index Calibration section in Chapter 12 –
Software Calibration for details.
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