Delta MMC120 - Manual (Page 76)

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Extend limit must be greater than retract limit
This parameter error indicates that the EXTEND LIMIT was set to a position in which
the TRANSDUCER COUNTS would be less than or equal to those at the RETRACT
LIMIT position. Therefore, if the SCALE is positive, this error indicates that the
EXTEND LIMIT is less than the RETRACT LIMIT . Otherwise, this error indicates that
the EXTEND LIMIT is greater than the RETRACT LIMIT .
Dead band eliminator out of range
This parameter error indicates that the DEAD BAND ELIMINATOR parameter was set
to a value greater than ±2000. This maximum prevents a dead band of greater than 2
volts. If a valve still does not work to satisfaction with this large of a dead band, then the
valve is most like not appropriate for the job. Refer to Hydraulic System Problems for
details.
Invalid command received
This parameter error indicates that the COMMAND is invalid. Refer to that topic for a
list of valid commands.
Move would cause discontinuity
This parameter error is generated when the requested move fields would have generated a
discontinuity in the speed. This occurs if the axis is stopped, and the user specifies an
ACCELERATION distance of 0 on a move to another location. In order to carry out this
request, the motion controller would have to instantaneously increase the speed to the
maximum speed. This would generate a discontinuity, and therefore instead the move is
rejected and this parameter error is generated. To fix this problem:
• Verify that your control program is sending the command correctly.
• If you really want to accelerate instantaneously to the maximum speed, you can use a
very high ACCELERATION in Acceleration Modes 0 and 1, or a very low
ACCELERATION in Acceleration Modes 2 and 3.
The acceleration or deceleration ramp is too slow
When a new move command is sent to the motion controller, the motion controller must
calculate the distance that each of the ramps (acceleration and deceleration) will take. If
this calculation overflows, this parameter error is generated. The overflow occurs when
the calculated ramp would take longer than 65535 position units. This overflow can
occur even if the axis is moving a much shorter distance. There are two ways to fix this
problem:
• Increase the ACCELERATION and/or DECELERATION values.