9/4/2015 3:31 PM | |
Posts: 25 Rating: (1) |
Hi Friends, As I'm new with the Masterdrives and I do have some questions. In an installation with 7 MasterDrives in total, there are 3+1 drives activated (showing o009 at the PMU) for handling some windings, the other 3 are stopped for operation (showing o008 at the PMU), The drives are controlled with a S7-414-2DP. The drives are DC-powered drives, the DC is rectified. In the PLC-software the Drives are controlled started. But the program is stopped when the check for DC-Link (DC-power without error) is performed, it is checking the state of bit11 in the StatusWord of the drives. For service they asked me to investigate the reason why the winches couldn't be used anymore. Starting with the hardware and software of the PLC I didn't find trouble. Then I asked the operator what happened when the problem occured. The customer told me the powersupply was changes from one to another source while one of the drives was just running. After this power-switching event, the drives are not longer working. With this knowledge I started to read some documentation for the masterdrives at site, there was no internet available. In the documentation and comments in the PLC-software I found the information about bit11 in the status-word (Stoerung Unterspannung). And in a VAT-table I found these bit active for all 3+1 drives, the other 3 drives till now not checked. So the power after the rectifier has probably dropped below the level for detecting the 'Low Voltage'. In the documentation is written that this status is stored in memory and available after the power is restored. The status of the drives is not showing any error/warning in the display. In the documentation of the drives there is mentioned to check the value for a lot of parameters. But I can't select the requested parameters - they are not in the list. Probably because the ProfiBus is in charge for controlling the drive, isn't it? Measuring the DC-voltage at the rail resulted in approx. 613V (just measured, not logged for longer time) Now I'm back 'home' and I read here in the forum the drive can show with r006(?) the voltage of the DC-power. I didn't check this parameter, so I don't know this value. Switching off the power-supply for this Cabinet and switching it back on did not solve the problem. First time switching of the mainswitch with the drives enabled (o009 at the PMU) and second time with the drives disabled and switched of (PLC-program). My questions:
As said, I'm new with MasterDrives. Willing to learn I hope someone can support me... Regards, Willie In the attachment some screendumps of PLC-SW and data form the drives in a vat-table. AttachmentLowVoltage.zip (146 Downloads) |
9/7/2015 9:58 AM | |
Posts: 25 Rating: (1) |
Kicking Problem is unique? Nobody has had this experience or any information where to find the solution? |
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