In fact, F30005 and we are familiar with the kind of instantaneous overcurrent alarm is completely different things. It is more like the drive is complaining to you: "I have been running for too long, and if I carry on like this, I will heat up.” That's why so many systems work fine during the day, but then suddenly throw an F30005 at you in the afternoon when they're at their highest output, or after a few hours of continuous operation.
F30005 doesn't look at how strong the current is, it looks at how much you've sweated.
The definition of F30005 in Siemens system is: Power Unit: Overload I²t error, to put it bluntly, it is the power module in the belly of the drive, the heat load has exceeded the boundary of its ability to withstand. Many people see this alarm, immediately go to turn over the current readings, found that the current is quite normal, turned his head and began to suspect that there is a problem with the parameters, the motor is not right, or the drive is not lying about the military situation.
In fact, the biggest misunderstanding is here: F30005 is not at all staring at the "moment how high the current”, but "the past period of time, how much heat you have saved”. I²t protection is to do this job, it is calculated in the time of the current accumulation. It counts the accumulation of current over time.
Why does it say I'm overloaded when I'm running normally?
Let's say there are two units. The first one occasionally rushes and instantly eats 150% of the rated current, but it only lasts for two seconds; the second one has been running at 110% of the rated current, and has been working silently for half an hour. In reality, more likely to trigger the F30005, favoring the latter. Because the internal heat of the drive is a process of saving chicken feathers to get together duster, the current is a little bit higher, the time dragged a little bit, the heat will accumulate more and more quickly.
Siemens drive is to take I ² t this model to calculate the thermal load, I is the current, t is the time, it is constantly counting in the background: your current is now adding how much heat pressure to the power module. When this value slowly touched the upper limit, the system simply active pull the gate, in order to protect the inside of the IGBT and power devices.
That's why you will always hear customers say so: "This device has been running for three hours before jumping the alarm”, "a rush to the afternoon when the goods love this problem”, "reset and can hold a while! ". These phenomena are exactly the same as the temperament of I²t overload protection.
A lot of F30005, in fact, is the mechanical part of the sneaky overtime work
We repair machines in the field, always encountered such a drama: the customer bites the dead drive is bad, but when we take the meter a card current, only to find that the drive has been at full load up and down hard to support. And then along the way to check, the root is mostly in the mechanical. For example, the reducer inside the grinding, bad bearings, coupling eccentricity, silk rod committed jam, conveying line resistance. These problems will not come up to give you a break, but it will let the motor for a long time to carry a much heavier than normal burden in the run.
Simple example: the original drive only needs to be out of fifty percent of the force, now because of bearing injuries, have to kick to more than seventy percent to turn. Equipment can still move, the operator does not feel any obvious abnormalities, but the drive itself has a number in mind, it has been extra heat. Over time, F30005 naturally emerged. So when it comes to this alarm, our routine operation is to first feel the mechanical end of the situation, rather than boredom to dismantle the drive.
Some industries are inherently susceptible to F30005
Not all equipment is prone to this alarm. According to the laws we have repaired over the years, the kind of long-term low-speed high-torque boring dry equipment, especially easy to get hit. For example, extruders, mixers, lifting equipment, heavy conveyor belts, crushers and so on.
They have one thing in common: they do not turn fast, but have been eating force. A lot of people think that low speed sure load is light, in fact, the opposite is true, to maintain low speed and high torque, the drive often have to continue to output quite high current. A long time, the thermal load on the pile up. So in these industries, the probability of hitting the F30005 is much higher than conventional servo applications.
Heat dissipation is not good, is equivalent to cover the blanket to let the drive fever!
Although the F30005 is not essentially a temperature alarm, but the heat dissipation conditions are good, directly related to whether it will not move out to brush the sense of existence. You pull open some of the electrical cabinet, the fan has long stopped, the heatsink on a thick layer of ash, the filter blocked dead, the temperature inside the cabinet are running to 50 degrees. In this environment, even if the load has not changed, the drive is more likely to touch the threshold of thermal protection.
A customer's packaging line, a summer afternoon on time to pop F30005, the beginning of everyone to the load on the pondering, and later found that the reason is too simple: the temperature of the plant came up, the top of the cabinet cooling fan early bad no one knows. Replaced a new fan, F30005 has never come back. So when troubleshooting, be sure to walk through the cooling path first.
Driver selected small, every day small horse-drawn carts
This situation is generally out of the equipment remodeling. The original equipment load light, after the production capacity up, speed up, processing volume increased, and even replaced the larger motor, but the drive is still the original specifications. The result is that the drive is often posted full load run, over time, even if there is no fault itself, F30005 will be frequent door.
This is typical of a drive that has been forced to work under extreme conditions for a long time. If you find that the average current has been very high, the thermal load parameter is always above 80% floating, the equipment every day to report one or two alarms, then you have to seriously weigh up, now this piece of SINAMICS power module, whether it has been unable to frame the actual working conditions.
There is a parameter called r0036, which allows you to hear in advance the drive in the gasp!
A lot of maintenance brothers troubleshooting F30005, eyes just focus on the current. In fact, SINAMICS has a very useful diagnostic parameter, r0036, which shows the current thermal load of the power unit. You can directly interpret this number as the "fatigue level” of the drive. If it's been lying at close to 100 percent for a long time, it's only a matter of time before F30005 comes calling.
By watching the trend of r0036, you can often spot a problem before it trips, rather than having to wait until it stops completely. For continuous production lines, this parameter is much more useful than just looking at the current.
The F30005 alarm can't always be disliked with the reset button!
This alarm is supposed to protect the driver. If it pops up again and again, and you reset it every time as if it were nothing, the first to suffer are usually the IGBT module, power semiconductor devices, bus capacitors, and the entire heat dissipation system. Over time, the repair cost will be far more than the cost of the load you went to deal with the problem earlier.
So don't think of F30005 as a common reminder that can be dismissed out of hand. The fact that the driver is protesting indicates that there must be some hidden problems in the system.
With a little more effort, F30005 will be less of a pain in the ass.
From the idea of long-term maintenance, rather than waiting for the alarm to repair, it is better to keep an eye on the state of the equipment early. Regularly look at the trend of the motor current, pay more attention to the reducer and bearing movement, so that the cooling fan and filter to keep clean, by the way glance at the power module heat load parameters. Do not let the equipment for years and years under the full load of bored hard, start and stop frequently the machine is also appropriate to optimize the beat time.
It's not a big deal to do these things, but it's often better than waiting for something to go wrong and then replacing the driver.
Finally
A Siemens SINAMICS drive reporting F30005 does not necessarily mean that the drive is bad. It's more like telling you that my I²t thermal model has sensed that it is in a prolonged state of overload. This overload may be a continuous high load in the run, mechanical resistance becomes large, low-speed high torque in the boring, poor heat dissipation, or even when the drive selection on the small.
For CNC machine tools, automated production lines, packaging equipment, heavy conveyor belts, these years of continuous rotation of the system, as soon as possible to F30005 behind the real culprits to find out, not only can be less than a few stops, but also to extend the life of the Siemens drive and the whole machine equipment in real terms. If you do all the routine checks of the alarm is still there, then the power module, IGBT status and drive the internal circuit will have to find people like
Songwei CNC such a professional and then to the depth of the check, lest the small problems finally dragged into the sky repair bill.
