Limits
This screen allows you view and modify the various drive limits.
| Button or Dialog Box | Description | Parameter |
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Current Limits |
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Positive Peak Current |
The maximum positive current allowed. |
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Negative Peak Current |
The maximum negative current allowed. |
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| Dynamic Break Peak Current | The maximum amplitude of the current for dynamic braking. | DRV.DBILIMIT |
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Velocity Limits |
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Positive Speed Limit |
The maximum speed allowed in the positive direction. |
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Negative Speed Limit |
The maximum speed allowed in the negative direction. |
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User Over Speed Limit |
The user set threshold velocity for an over speed fault. |
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| Overall Over Speed Limit | The overall over speed fault threshold. | VL.VFTHRESH |
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Position Limits |
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Maximum Position Error |
The maximum position error. If the position error PL.ERR is larger than PL.ERRFTHRESH, then the drive generates a fault |
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Position Limit 0 |
The minimum position the drive can reach before generating a negative software position fault. |
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Position Limit 1 |
The maximum position the drive can reach before generating a positive software position fault. |
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Acceleration Limits |
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Acceleration |
The acceleration ramp used to profile some types of motion. |
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Deceleration |
The deceleration ramp used to profile some types of motion. |
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Motor Limits |
Motor limits are set through the Motor Foldback Screen (see Foldback) |
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Limits
The limits screen covers most of the basic system limits, including current, velocity, and position.
- Current Limits: The current limits are set based on the drive ratings. You can change these limits to be lower then the default values for the drive, however, this may effect the expected performance of your application.
- Velocity Limits: The velocity limits are set based on the motor ratings. You can modify these settings above the ratings of the motor if the application requires some overhead, but be aware the motor has mechanical limitations and may be damaged if run above those limits. It is best to leave these at the default ratings for the motor selected.
- Position Limits: The position limits can be set based on your specific machine application requirements. The Maximum Position Error can be set to cause a fault when the position error exceeds the value you insert here. Each limit switch can be either the lower or the upper software limit switch register, depending on the value of SWLS.EN. If only one limit switch is enabled (SWLS.EN = 1 or 2), then SWLS.LIMIT0 is the lower limit, and SWLS.LIMIT1 is the upper limit. If both limit switches are enabled (SWLS.EN = 3), then whichever switch is set to a larger value is the upper limit switch. The other switch becomes the lower limit switch. As the motor reaches the lower limit, the motor will stop and display the warning n107. As the motor reaches the upper limit, the motor will stop and display the warning n108.
- Acceleration Limits: This field allows you to raise accelerations to give the system crisp moves. These limits default to a low value, so you may wish to change these after the mechanics and other sections of your system are defined.
