PLC Pie Guy
Member
Hey folks.
I'm doing a small conveyor job right now with a series of small motors and 1 H.P. 525 drives.
I have never had an issue using line / load reactors before but something isn't just right here.
I'm using the reactor 1321-3R2-B for line and load on all of my drives. This number I got from the AB catalog, web part number configuration tool. I have 3 different motor amperages. .80 , 1.15 , and 1.4 . This is the part number I got for all of these motor amperages. SEW Motors.... However, I'm not sure the motors are the issue.
The problem presents itself like this. Start the drive, connected to the motor, if its not at least set to 20HZ, the output frequency doesn't match the command frequency and the at reference is false. Lets say I tell the drive to start at 5 or 6 HZ just to bump for rotation.... The drive will be flickering a frequency usually around 12 or 13, its changing really fast.. then it will climb, fall , anything but run steady. If I tell the drive to run at 30 or 60 HZ, anything higher than 20, it runs fine, at reference and all is good. Until, stop is pressed. I notice that if RAMP is set as my stop mode, the drive will ramp down to the flickerey 12 13 HZ and never stop until its faults with a STALL fault. If the stop mode is set to COAST, all is well, the drive stops without a hitch.
So, I was thinking it was a motor problem, until I noticed that the load reactor was blistering hot, line reactor cool as a cucumber. Then I opened the disconnect and told the PLC that it was closed so I could start the drive. Now, no motor, just drive, reactor and VFD cable to the disconnect, about 150'. Same thing. No stall fault but the command and output frequency don't jive.
Next I bypass the load reactor and all is well. As I would expect it to be.
Motor can ramp, at reference is set and not faulting.
I have not auto tuned yet as I was thinking there is a problem with the motors at first. I'm wondering if I need to auto tune with the reactor before I even start the motor?? Usually I get the direction and make sure the motor will run before I do the auto tune as I'm used to being asked to use old motors before new ones. (as is the case here, really bad condition motors!) Often I will find the bad ones once connected to the frequency drives and end up trying a few before one works. Then I auto tune. Unless its a project with new motors, then Ill do it right off the hop.
This is the only thing I can think of that could cause this kind of issue. Ill be trying again today at the site but I wanted to see if any opinion exists on this before hand.
Is there any special parameters you guys set up for use with Line / Load reactors. The parameter settings here are as basic as it gets and I'm not doing anything different than I normally would.
Any insight on this would be great. Hopefully somebody has seen this before
Thanks
I'm doing a small conveyor job right now with a series of small motors and 1 H.P. 525 drives.
I have never had an issue using line / load reactors before but something isn't just right here.
I'm using the reactor 1321-3R2-B for line and load on all of my drives. This number I got from the AB catalog, web part number configuration tool. I have 3 different motor amperages. .80 , 1.15 , and 1.4 . This is the part number I got for all of these motor amperages. SEW Motors.... However, I'm not sure the motors are the issue.
The problem presents itself like this. Start the drive, connected to the motor, if its not at least set to 20HZ, the output frequency doesn't match the command frequency and the at reference is false. Lets say I tell the drive to start at 5 or 6 HZ just to bump for rotation.... The drive will be flickering a frequency usually around 12 or 13, its changing really fast.. then it will climb, fall , anything but run steady. If I tell the drive to run at 30 or 60 HZ, anything higher than 20, it runs fine, at reference and all is good. Until, stop is pressed. I notice that if RAMP is set as my stop mode, the drive will ramp down to the flickerey 12 13 HZ and never stop until its faults with a STALL fault. If the stop mode is set to COAST, all is well, the drive stops without a hitch.
So, I was thinking it was a motor problem, until I noticed that the load reactor was blistering hot, line reactor cool as a cucumber. Then I opened the disconnect and told the PLC that it was closed so I could start the drive. Now, no motor, just drive, reactor and VFD cable to the disconnect, about 150'. Same thing. No stall fault but the command and output frequency don't jive.
Next I bypass the load reactor and all is well. As I would expect it to be.
Motor can ramp, at reference is set and not faulting.
I have not auto tuned yet as I was thinking there is a problem with the motors at first. I'm wondering if I need to auto tune with the reactor before I even start the motor?? Usually I get the direction and make sure the motor will run before I do the auto tune as I'm used to being asked to use old motors before new ones. (as is the case here, really bad condition motors!) Often I will find the bad ones once connected to the frequency drives and end up trying a few before one works. Then I auto tune. Unless its a project with new motors, then Ill do it right off the hop.
This is the only thing I can think of that could cause this kind of issue. Ill be trying again today at the site but I wanted to see if any opinion exists on this before hand.
Is there any special parameters you guys set up for use with Line / Load reactors. The parameter settings here are as basic as it gets and I'm not doing anything different than I normally would.
Any insight on this would be great. Hopefully somebody has seen this before
Thanks