Joe Vierzba
Member
I have a system that has 4 Powerflex 525 VFD's 0.5HP, 480VAC, Version 2.002 Firmware. Using Ethernet IP to communicate to the drives from a 1769-L24ER-QB1B controller (V21 Firmware)
2 of the VFDs are being used to run conveyors, they do not do anything special, they have ADC configured, and I have no problems with them.
However, the other 2 PF525's are being used for positioning (Step-Logic) which requires that I write messages to the drive which allow me to change the motion profiles based on product recipes, etc. I am aware that writing too many messages to the drive can destroy the EEPROM, so I have taken the following steps: 1) Made sure that the messages that are being written only happen when a parameter has been changed. 2) Set the value of parameter C121 to '1' Ram Only so that messages that are written should not affect the EEPROM. Because this parameter is set to '1' - I do NOT have ADC turned on for these two drives.
The problem I am having is that intermittently (with greater frequency), the drives lose their parameters (IP Address and all) and go back to out-of-the-box default values when power is cycled on them (Showing an F100 Fault). This happens to both drives. The solution is to remove the Ethernet connection enter the IP address parameters, cycle power, enter all of the necessary parameters again, change C121 back to '1' and then reconnect Ethernet. This keeps the drives running until power is lost again.
I spoke to Rockwell Tech Support and they could not give me any answers and have replaced the two VFD's under warranty, but the problem started again right away with the new drives. I strongly feel that this has something to do with the messaging to this drive, but I can't find anything wrong. I am considering changing to a 1769-L24ERM controller so that I can replace these drives with Powerflex 755 drives that can handle CIP motion without using them in an unorthodox way.
Any ideas would be most helpful
2 of the VFDs are being used to run conveyors, they do not do anything special, they have ADC configured, and I have no problems with them.
However, the other 2 PF525's are being used for positioning (Step-Logic) which requires that I write messages to the drive which allow me to change the motion profiles based on product recipes, etc. I am aware that writing too many messages to the drive can destroy the EEPROM, so I have taken the following steps: 1) Made sure that the messages that are being written only happen when a parameter has been changed. 2) Set the value of parameter C121 to '1' Ram Only so that messages that are written should not affect the EEPROM. Because this parameter is set to '1' - I do NOT have ADC turned on for these two drives.
The problem I am having is that intermittently (with greater frequency), the drives lose their parameters (IP Address and all) and go back to out-of-the-box default values when power is cycled on them (Showing an F100 Fault). This happens to both drives. The solution is to remove the Ethernet connection enter the IP address parameters, cycle power, enter all of the necessary parameters again, change C121 back to '1' and then reconnect Ethernet. This keeps the drives running until power is lost again.
I spoke to Rockwell Tech Support and they could not give me any answers and have replaced the two VFD's under warranty, but the problem started again right away with the new drives. I strongly feel that this has something to do with the messaging to this drive, but I can't find anything wrong. I am considering changing to a 1769-L24ERM controller so that I can replace these drives with Powerflex 755 drives that can handle CIP motion without using them in an unorthodox way.
Any ideas would be most helpful