I am currently using a PowerFlex 753 connected through analog 4-20mA. However, there seems to be a discrepancy between the speed reference I input from the HMI and the actual speed output. I am utilizing Automation Direct productivity hardware for this setup. To calibrate the system, I adjust the HMI command from 0-100 to the required analog card range of 0-65535, with an output range of 4-20. A Fluke clamp-on 4-20mA meter confirms the correct current output for a specific speed, such as 12mA for a 50% command. Upon checking the PLC and the drive, Parameter 522 is set to zero and Parameter 520 is set to 60. Despite this, when I command 100%, I receive only 59.9%, resulting in a speed of 35Hz instead of 50Hz. It appears there may be a parameter issue within the drive configuration, possibly stemming from the previous intervention of an inexperienced electrician. Since I am currently without the necessary serial port connection, I am unable to fully investigate the issue. Although the blame has been wrongly placed on the PLC, I suspect the root cause lies within the drive settings. Any insights or advice on resolving this technical issue would be greatly appreciated.
What do P261 (Analog In 0 Hi) and P262 (Analog In 0 Lo) settings signify?
I discovered the addon IO card that had been tampered with by the general manager, resulting in the ma min being set to 0.
The voltage settings for native analog drives have been configured to operate at volts. Upon inspecting the site, I noticed the presence of an IO card.
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Answer: - The speed reference discrepancy could be related to the configuration settings within the drive, especially if Parameter 522 and Parameter 520 are not set correctly. It is essential to ensure the drive settings align with the required speed ranges.
Answer: - To calibrate the system, you need to adjust the HMI command range to match the analog card range, typically from 0-65535, with an output range of 4-20mA. Using a current meter can help confirm the correct current output for specific speed commands.
Answer: - The discrepancy in speed output could be due to incorrect parameter settings in the drive configuration. It is crucial to review and adjust parameters like Parameter 522 and Parameter 520 to ensure accurate speed control.
Answer: - If you lack a serial port connection for detailed investigation, you may need to focus on checking and adjusting the drive settings accessible through the HMI or any available diagnostic tools.
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