Hello everyone! I am facing a task where I need to set a specific speed on a VFD Danfoss Aquadrive FC-202 in case it loses communication via Ethernet with the PLC. This will ensure that the VFD follows a Preset reference instead of the reference from the PLC. There are certain parameters that can achieve this, but they are not ideal as they would utilize the maximum RPM defined for the motor: 803 Control Timeout Time, 804 Control Timeout Function (Max. speed), and 805 End-of-Timeout Function (Resume set-up). It would be preferable to utilize the following parameters: 304 Reference Function (External/Preset) and 310.0 Preset Reference at 1000. Through smart logic, I can select a Preset when communication is lost, but I still need to enable the Preset instead of using an External reference. The only method I have found to enable the Preset is by using digital inputs such as Terminal 18 Digital Input at 510 (Preset reference on). However, I am looking for alternative ways to enable the Preset without relying on a digital input. Is there any other solution to achieve this? Your insights are appreciated! Thank you.
Do you have any helpful advice or suggestions?
I have a query about Danfoss VLTs. As a newcomer to using FC-280s for position control, which are connected to a CompactLogix, I rely on PCDs for all control operations. Should I consider transitioning VLT control from the PLC to local control in the event of communication failure?
ceilingwalker inquired about setting up Danfoss VLT FC-280's for position control, networked with a CompactLogix PLC. The question pertained to maintaining local control via push buttons in case of communication loss. One of the solutions proposed was using two setups and configuring parameters 5.xx or utilizing Smart Logic. The preference was for Smart Logic. The goal remains for the VFD to continue to follow a defined reference even in the event of communication loss.
Revnus mentioned the importance of local control through push buttons in case of communication loss, a key aspect that has already been successfully addressed. There are two options available: configuring parameters 5.xx in one setup, or utilizing Smart Logic. The preference is to use Smart Logic. However, there is still a need for the VFD to adhere to a specific reference in case of communication failure. I have been exploring ways to transfer configuration parameters from the PLC to the VLT without relying on MCT-10 or the LCP. Is it possible to customize the PCDs, or are they pre-assigned in the firmware? Your insights on this matter would be greatly appreciated. Thank you.
I was looking for a method to transfer configuration parameters from the PLC to the VLT without relying on MCT-10 or the LCP. Is it possible to customize PCDs, or are they pre-assigned in the firmware? Thank you for your assistance. Yes, it is indeed possible to customize some parameters in the PLC. Take a look at parameter 1221 for a list of parameters that can be written from the PLC.
I think you might have overlooked the process of utilizing the automatic mains failure function (AMF). This function can force the drive to switch over to a preset speed once it detects a communication loss. You can program specific actions and reaction times, effectively ensuring that your drive doesn't just go into max speed mode. Alternatively, have you considered a failsafe network protocol like ProfiSafe or a control cycle watchdog timer? Depending on your setup, these could provide another layer of security without the need for hardwired digital inputs.
I see what you're trying to achieve and it indeed presents quite a challenge. Although you're avoiding using a digital input, have you considered using a network message function? The Aquadrive FC-202 supports a function known as Network Message (Parameter 953), which can be used to control settings on the drive. Provided your drive is on a network, and you have control of messages being sent; this function theoretically could be used to switch between external and preset references. It indeed adds a layer of complexity but could be an alternative not requiring the use of Terminal 18. Feasibility may depend on system infrastructure, so think of it as a starting point. It's highly suggested to reach out to the Danfoss technical support team, who may provide specific insights or alternatives within the parameters of their equipment.
Hey! It sounds like you're tackling a pretty intricate setup. One idea could be to leverage the VFDâs programmable logic capabilities. If your VFD allows you to write logic functions, you might be able to configure it to switch to the preset reference when a loss of communication signal is detected. Another option might be looking into the "Control Mode" settings where you can define fallback behaviors, which could help in your situation too. Check the manual for any flexible parameters that allow you to set a fallback condition based on internal events rather than external inputs. Good luck!
Hey! It sounds like you're on the right track with your logic setup using the VFD. Have you considered utilizing the VFD's built-in fault handling features? You might be able to configure a secondary control mode through the parameters which allows the VFD to default to your desired preset speed without needing to rely on a digital input. Another option could be to look into using the parameter 301 (Reference Source) to switch over to your preset upon detecting a fault in communication, although it may require some testing to see how it behaves in your specific setup. Good luck, and I hope you find a solution that works for you!
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Answer: - Currently, the most common method to enable the Preset reference on the VFD is by using digital inputs such as Terminal 18 Digital Input at 510 (Preset reference on). However, there might be alternative solutions available to achieve this without relying on a digital input.
Answer: - Parameters such as 304 Reference Function (External/Preset) and 310.0 Preset Reference at 1000 can be used to select a Preset reference when communication is lost. Alternatively, parameters like 803 Control Timeout Time, 804 Control Timeout Function (Max. speed), and 805 End-of-Timeout Function (Resume set-up) can also be considered, but they might utilize the maximum RPM defined for the motor.
Answer: - Yes, by properly setting the parameters related to reference functions and Preset references, you can configure the VFD to follow a Preset reference when communication is lost with the PLC. Additional logic may be required to ensure seamless operation in such scenarios.
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