Newport XPS Programmer's Manual page 692

XPS Unified
EDH0373En1023 — 01/18
Minus end of run glitch: Undesirable, momentary instability of the hardware minus end
of run signal, for instance can be generated by ripple or noise.
Plus end of run glitch: Undesirable, momentary instability of the hardware positive end
of run signal, for instance can be generated by ripple or noise.
Encoder quadrature error: Error generated when the signals of both encoder channels
simultaneously change. In normal operation, only one quadrature signal changes state at
a time. This error can occur due to an undesirable level change or a glitch as illustrated
below.
Encoder freq. and coherency error: Error generated when the frequency of the signals is
too high. The maximum frequency of the encoder input is 25MHz.
Hard interpolator encoder error: Error generated when the difference of the sine/cosine
encoder signals from a unity circle is too large (for instance when signals are phase
shifted or amplitude modified).
Hard interpolator quad. encoder error: Error generated when the signals of both
encoder channels of the hardware interpolated encoder output simultaneously change.
Same error as Encoder quadrature error except that the quadrature signals are those
converted from the sine/cosine signals of the hard interpolator. The hardware
interpolator is used only with AnalogInterpolated encoders to trigger the position
compare output and to gather positions during external data gathering.
First driver in fault: problem with the first driver.
Second driver in fault: problem with the second driver in case two drivers are connected
to one axis.
First driver powered on: First driver with motor ON after initialization.
Second driver powered on: Second driver with motor ON after initialization, in case two
drivers are connected to one axis.
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Programmer's Manual