Delta MMC120 User Manual download pdf (Page 125)

125

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.

Bit4-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.

Bit6-PositionOverflow

This bit is set when the actual position has exceeded the range that can be displayed with

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 149 150

No comments

Delta MMC120 User Manual Page 125