Delta MMC120 User Manual download pdf (Page 74)

Parameter Errors

Target position moved outside limits

This parameter error indicates that the axis was about to move its Target Position outside

the extend or retract limit. The target position is truncated to the limit when this error

occurs. Commands that have a requested position outside the limits are caught

immediately by the “Attempt to go beyond extend limit”and“Attempttogobeyondthe

retract limit” parameter errors.

Therefore, the only way this error can occur is by lowering the deceleration rate in the

middle of a move enough so that the axis overshoots the commanded position and limit.

We could catch this error when the command is issued but do not because some

applications have an axis decelerate slowly for a period of time, but then issue another

command to stop it within the limits. These applications would be impossible if we

didn’t allow this deceleration even though, if uninterrupted, it would bring the axis

outside the limit.

NOTE: This error will not occur when the Actual Position goes outside the limits.

That is, you will be able to control position at either limit even though the

Actual Position may go outside the limits temporarily.

FLASHcontainednodataonstartup

This parameter error will appear on either the first or second axis on startup whenever

there is a problem loading the parameters or event steps from FLASH memory. If this

parameter occurs on axis 1, then profiles and parameters could not be loaded. If this

parameter occurs on axis 2, then event steps could not be loaded. Default will be used.

To store parameters in the FLASH, load the motion controller with all desired

configuration parameters, and issue a Update FLASH command. You must wait for the

ACK to toggle—indicating that the FLASH write is complete—before powering off the

module. If this parameter error appears, one of the following has occurred:

•The module is newly shipped. New modules have no data stored in the FLASH.

• The module was powered down while updating the FLASH. This results in an

invalid checksum being found for the data, so the FLASH is not usable on next

power-up.

• The FLASH itself has a problem with it. If you find that the FLASH consistently

does not store data, although the module is not being powered down while the

FLASH is being written to, contact the manufacturer for details on having the FLASH

replaced.

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Delta MMC120 User Manual Page 74