skiier
Electrical
- Nov 12, 2003
- 140
Have recurring faults from AB 1336 impact drives.
The faults are occurring on two diferent machines.
One machine has 2 drives and the other has 3.
These machines are enviromental test cells which mostly test automotive parts.
The loads on the drives are very light usually but the test durations average probably 50 to 200hrs per test.
These machines are about 15 yrs old but have only recently begun to have problems with faults.
The drives are also set to ramp from one speed to another whenever a speed change occurs.
Some general info;
The faults tend tocome randomly and have no set pattern or fault type. For example; I have recorded from the drives (via the HMI interface) an "overload", "overvoltage", and "HW fault".
The load is very light on these drives and "overhauling" is not a problem I do not think?
Both machines arw connected to the same distribution bus.
I think , and help me out on this point if anyone can , the combination of age and a noisy distribution bus is tending to cause individual drive DC bus voltage swings and hence faults.
Capacitors only last so long and I am thinking that maybe this could be the problem.
Now I know there can be a million questions regarding more info about this post but pls be reasonable and do not split hairs over the most trivial details. I wish to hear from people who have experience with three phase voltage problems and particularly those who have reviewed with multiple drives.
These machines are well maintained. The motors and bearings and belts are routinely checked.
The faults are occuring on five impact 1336 drives that are running and ramping simultaneously and they are connected to the same 600v three phase bus.
Also this equipment is located in a plant that has a lot of industrial machinery and a very large main service. Equipment such as other large vfds, welders, and other inductive loads are all part of the noise in this system and every year it seems more and more noisy equipment is added to the plant.
Like I stated before could the combination of 600v distribution bus voltage swings and noise cause faults with older drives?
Anyone?
The faults are occurring on two diferent machines.
One machine has 2 drives and the other has 3.
These machines are enviromental test cells which mostly test automotive parts.
The loads on the drives are very light usually but the test durations average probably 50 to 200hrs per test.
These machines are about 15 yrs old but have only recently begun to have problems with faults.
The drives are also set to ramp from one speed to another whenever a speed change occurs.
Some general info;
The faults tend tocome randomly and have no set pattern or fault type. For example; I have recorded from the drives (via the HMI interface) an "overload", "overvoltage", and "HW fault".
The load is very light on these drives and "overhauling" is not a problem I do not think?
Both machines arw connected to the same distribution bus.
I think , and help me out on this point if anyone can , the combination of age and a noisy distribution bus is tending to cause individual drive DC bus voltage swings and hence faults.
Capacitors only last so long and I am thinking that maybe this could be the problem.
Now I know there can be a million questions regarding more info about this post but pls be reasonable and do not split hairs over the most trivial details. I wish to hear from people who have experience with three phase voltage problems and particularly those who have reviewed with multiple drives.
These machines are well maintained. The motors and bearings and belts are routinely checked.
The faults are occuring on five impact 1336 drives that are running and ramping simultaneously and they are connected to the same 600v three phase bus.
Also this equipment is located in a plant that has a lot of industrial machinery and a very large main service. Equipment such as other large vfds, welders, and other inductive loads are all part of the noise in this system and every year it seems more and more noisy equipment is added to the plant.
Like I stated before could the combination of 600v distribution bus voltage swings and noise cause faults with older drives?
Anyone?