Greetings everyone, I am new to this community and new to PLC's in general. We are currently facing an issue with a servo drive that controls the movement of a cross travel beam. The problem arises when the servo motor abruptly stops in certain situations. It accelerates and decelerates smoothly in automatic mode, but stops suddenly when in jog mode or when the emergency stop button is activated or safety gates are opened mid-travel. Is there a way to resolve this issue and have the motor stop gradually in these scenarios? Any assistance on this matter would be greatly valued. Thank you, Walt.
When considering how to halt the jog command, it is important to ensure that the stop command in the program includes decceleration rates.
In order to stop the jog command effectively, it is important to consider the deceleration rates included in the stop command of the program. I will investigate this further.
When looking for instructions related to Motion Automation System (MAS), there is an option to adjust the Deceleration (Decel). By selecting "NO", the system will use the Decel value from the previous motion command (such as MAJ or MAM). Choosing "YES" means the system will utilize the deceleration specified in the MAS. It is important to note that the Decel can be measured in units per second squared, percentage, or time, so it is crucial to understand the units in order to determine whether the value should be increased or decreased. The way Emergency Stop (EStop) is handled depends on the specific configuration. If CIP Safety is used, it will vary depending on the drive being used (ERS3 or ERS4, for example) which have controlled motion stops like SS1. Alternatively, if a hardwired Safe Torque Off (STO) is used, there will be fewer options available.
Hi Walt, welcome to the community! The abrupt stop you're experiencing in jog mode or following an emergency stop command could be a direct safety measure. This is to ensure an instantaneous halt of operations when something goes wrong. However, if the sudden stop is causing a problem, you may want to look into adjustable ramp-down settings of your servo drive. Most drives have parameters allowing you to alter the deceleration rate during these states. If you adjust this, you might be able to attain a more gradual stop. Always remember though, safety first. Make sure a slower stop won't risk the safety of your operation. Check the drive manual or get in touch with the manufacturer's tech support if you're unsure how to make these changes.
Welcome to the community, Walt! Based on your explanation, it looks like your PLC program might have different logic for automatic vs manual (jog) modes, thus causing the abrupt stoppage. But it's also important to remember that a sudden stop when the safety gates are opened or the emergency stop button is activated is normal behavior meant to ensure operator safety. You might want to maintain this feature, as a gradual slow down in emergency scenarios might not be ideal. However, for the jog mode, I'd suggest checking the deceleration parameters in your servo drive setup. With some drives, you can set different acceleration or deceleration ramps based on operating mode. Best of luck with your troubleshooting!
Hey Walt, welcome to the community! It sounds like your issue might be related to the PLC programming around the different operating modes. The abrupt stop could be the servo drive receiving an immediate stop command during jog mode or when safety measures are triggered. You could look into modifying the PLC program so that it gradually decelerates the motor upon receiving these triggers, but bear in mind that for safety gates or emergency stop, it often requires an immediate disengagement as per safety standards. Always ensure your systems meet those safety requirements. Hope this gives you a starting point!
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Answer: Answer: The sudden stops in jog mode or when safety features are triggered mid-travel could be due to the servo drive's current configuration not allowing for gradual deceleration in those specific scenarios.
Answer: Answer: To resolve the problem of sudden stops, you may need to adjust the settings of the servo drive, such as configuring the deceleration profile or adjusting the emergency stop behavior to enable smoother deceleration.
Answer: Answer: Yes, in the Kinetix 5500 PLC system, you can typically modify parameters related to acceleration, deceleration, and emergency stop behavior to ensure the servo motor stops gradually in various scenarios. Consulting the system's documentation or contacting technical support for guidance on parameter adjustments would be beneficial.
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