I need help troubleshooting an issue where my VFD is not turning on the motor when controlled from the HMI. However, the motor runs when controlled directly from the VFD using parameter p0070, but the frequency is lower than the set value on the HMI. Any suggestions on how to resolve this problem would be greatly appreciated.
Haroon Aziz is seeking assistance with running a motor from an HMI but is encountering difficulties with the VFD not turning it on. When attempting to run the motor directly from the VFD using p0070, it does turn on but the frequency is lower than what was set in the HMI. Can anyone offer troubleshooting advice for this issue? Your input would be greatly appreciated.
Insufficient details are provided about the issue at hand. The absence of a P070 is noted, with only an R070 present which pertains to the bus voltage.
I apologize for the inconvenience. Despite indicating that I am operating the motor through an HMI, the motor does not actually turn on when activated from the HMI interface. The display shows that the motor is running, but in reality, it remains inactive. When I manually start the motor using R0070 through the VFD, it does start but at a frequency too low to move water from the tank to the reservoir efficiently. I am puzzled as to why the motor fails to start when initiated from the HMI.
It seems like there may be confusion regarding parameter r0070, which is a read-only status point of the drive and cannot be changed. It appears that the motor may not be receiving a reference from the HIM to run from the VFD. Can you provide details on the settings for P1000 and P700, as it is suspected that these may be the parameters you are attempting to adjust.
Robertmee pointed out that changing the r0070 parameter is not possible as it is designated as read-only. This parameter reflects the status of the drive and cannot be altered. It seems there may be confusion regarding how the motor is being operated from the VFD without providing a reference from the HIM. The values of P1000 and P700 are crucial in this situation, with suspicion leaning towards P700 as the parameter in question. Unfortunately, these values will be provided tomorrow as access to the VFD is currently unavailable. Thank you for the response.
It sounds like you may be experiencing a communication issue between your HMI and VFD. Check first to see if your HMI is properly parameterized to communicate with the VFD. Too, verify if the control word mapping in the VFD matches the HMI's configuration. If the frequency is lower than the set value on the HMI, it might be due to incorrect scaling or a mismatch in the units used on both devices. Lastly, inspect your cabling system for possible wear and tear or electrical noise, as these could disrupt signal transmission.
It sounds like the issue might be a communication error between your HMI and VFD. Try double-checking your Modbus or other communication settings in both the VFD and HMI to ensure they match. Sometimes, the problem might be as simple as a wrong slave address or mismatch in the baud rate. If the issue persists, you may need to review the programming logic in your HMI. Also, since the motor is running at a lower frequency, it would be worthwhile to verify whether the correct values have been entered in parameter p0070 for your particular motor. Don't forget to save any changes before you exit the setup.
It sounds like you're dealing with a communication or configuration issue between the HMI and the VFD. First, double-check your control settings on both devices to ensure they match, especially the communication parameters like baud rate and protocol. Also, look into whether the HMI is properly sending the start command and that there’s no alarm or fault condition active on the VFD that's preventing it from starting. Lastly, verify if there's any scaling or limits set in the HMI that might be affecting the frequency output. Good luck!
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Answer: 1. Why is my Siemens MicroMaster 440 VFD not turning on the motor when controlled from the HMI? - The issue could be related to a configuration error between the HMI and the VFD. Check the communication settings and ensure they are properly configured for seamless operation.
Answer: - This could indicate a discrepancy in the frequency settings between the HMI and the VFD. Verify the frequency settings on both devices and ensure they match to achieve the desired output.
Answer: - Start by checking the wiring connections, parameter settings, and communication setup between the HMI and the VFD. Ensure that all configurations are correct and consistent to troubleshoot and resolve the motor control problems effectively.
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