Delta MMC120 - Manual (Page 125)

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If a new transducer count differs from the previous reading by more than 100 counts for
six consecutive milliseconds, the new value is assumed to be an error and this error bit is
set. When the Transducer Noise bit is set, the system response depends on the setting of
the AUTO STOP word. It causes a Hard Stop or a Soft Stop, depending on the setting of
AUTO STOP bit 10. This bit will stay on until a new command is given to the axis.
Bit 3 - Transducer Overflow
This bit is set when there has been no stop pulse from the transducer by the time the
counter has overflowed 18 bits (about 2 ms). When this bit is set, the system response
depends on the setting of the AUTO STOP word. It causes a Hard Stop or a Soft Stop,
depending on the setting of AUTO STOP bit 11. This bit will stay on until a new
command is given to the axis.
Bit 4 - Overdrive
This bit is set when the calculated drive output exceeds the 12-bit range of the D/A
converter. Usually this error indicates the system does not have enough power to drive
the axis at the requested SPEED . The module will truncate the drive to 12 bits (+10V or
–10V). It causes no action, a Soft Stop, or a Hard Stop, depending on the setting of
AUTO STOP bits 4 and 12. This bit will stay on until a new command is given to the
axis.
Bit 5 - Parameter Error
This bit is set when an initialization parameter or control parameter is out of bounds. In
some cases one parameter’s limit will depend on the value of another parameter, so
definite limits may not always be available. However, the motion controller does try to
replace the erroneous value with another that is within range, so the offending parameter
can be determined by comparing the parameter values before and after the error bit is set.
This error causes no action, a Soft Stop, or a Hard Stop, depending on the setting of
AUTO STOP bits 5 and 13. This bit will stay on until a new command is given to the
axis.
Because this error bit is used for many types of errors, the monitor program has the
ability to display the last several parameter errors in more detail. This list of errors is
compiled only while the monitor program is running, so it is recommended that the
monitor program be left running while configuring the system. The last parameter error
type for each axis is stored on the module and read-up when the module is connected to
the monitor program.
To display this list, select Parameter Error List from the Window menu. For control
firmware versions dated 19971016 or later, this list should include brief descriptions of
the last twenty parameter errors to occur on the motion controller. To receive help on a
particular error, in the error list, click on the error, and then click Help on Error.
Bit 6 - Position Overflow
This bit is set when the actual position has exceeded the range that can be displayed with