This is one of the most typical features of the F30002. A lot of customers say the same thing: the machine is running normally, nothing, acceleration is fine, full speed is fine, but just in the deceleration of the moment, the alarm light is on. This is related to the
Siemens servo motor. When the motor is running with the load, it is eating electricity. But once the equipment began to decelerate, the situation is reversed - the motor from the electricity into the power generation. Mechanical inertia carries it around, and it in turn pumps power into the drive. This part of the regeneration out of the power if it is too late to consume, it will be in the DC bus more and more, bus voltage followed by miso to rise, and so up over the protection value, F30002 on the face of the smash.
So like CNC machine tool spindles, centrifuges, winding equipment, heavy-duty conveyor lines, large robots, these inertia guys, the probability of bumping into this alarm is particularly high.
Deceleration time is set too fierce, braking resistors are too late to breathe!
Many field engineers check half a day of hardware, and finally found that it is a parameter matter. Let's say, a spindle from three thousand revolutions to zero, you let it brake in a second, the huge mechanical energy in the blink of an eye all back to the drive, bus voltage instantly soared up, there is no time to digest. At this time, even if the drive is good, the motor is good, the braking resistor is also good, the report F30002 or as reported. So we encountered this fault, the first habit is to look at the timing of the alarm. If a deceleration, a press emergency stop will be out, then try to decelerate the appropriate time to stretch a little longer. A lot of equipment is just adjusting the ramp parameter, without even changing a screw.
The brake resistor is damaged, and the regenerative power has no place to go, but is held in the busbar.
The importance of the braking resistor can be easily overlooked in equipment that starts and stops frequently. The power recovered from the drive has to go somewhere, and the braking resistor is responsible for doing just that - dissipating the excess power into heat. If the braking resistor open circuit, the resistance value is not correct, or the braking unit does not work, the regeneration of electricity will have no place to go, only all piled up in the DC bus.
The scene can often come across this scene: drive report F30002, you take a meter to measure the input voltage, normal; parameters are also checked, no problem; and finally looked down, the braking resistor terminals are burned black. Change one up, the alarm is immediately gone. Therefore, when checking F30002, the braking resistor is definitely the key object of care, don't skip it.
The supply voltage itself is high, the bottom of the bus is high, and then a patch will exceed the standard.
This is not as common as the first two, but it is worth paying attention to. Some factory transformer taps are set incorrectly, the grid voltage is high for a long time, the power supply is unstable with generators, or the compensation system is faulty, which may cause the drive inlet voltage to exceed the specified value. Bus voltage is originally AC rectified, the higher your inlet voltage, the higher the bottom of the bus voltage. If the bottom of itself is almost touching the upper limit, decelerate a little bit of feedback back to a little bit of electricity, easily break through the protection threshold.
So it's best to take a multimeter or a power quality analyzer and hit all three voltages, L1-L2, L2-L3, and L1-L3, to see if they are balanced and not out of spec.
Reporting F30002 just after tuning the equipment, maybe the wires have been interrupted
There is another situation that is particularly likely to occur after a new installation, remodeling, or replacement of the drive. Previously run a good device, change the block driver or re-tuned once, F30002 on the frequent emergence of the head. At this time, do not rush to suspect that the hardware is bad, first check the parameters and wiring - especially those with the VSM voltage detection module system. If L1, L2, L3 phase sequence is reversed, or voltage detection line is not connected to the right, the driver may misjudge the bus state, give you a false alarm. It looks like the driver is out of order, but in fact, the wires are not connected properly.
Ruling out the peripherals, it's the drive itself!
Of course, it is also true that some of the drive itself is really bad, especially those who have been used for a number of years SINAMICS old machine. We repair common: DC bus detection circuit floats, bus sampling is not normal, IGBT module leakage, power board failure, voltage feedback loop abnormalities, capacitor aging leads to detection distortion. This type of problem is difficult to rely on the scene that the multimeter is difficult to determine, generally have to run on the professional
Siemens test bench full load to catch out. If the input voltage is normal, the braking system is normal, and the parameters are reasonable, F30002 is still frequent, then you really need to consider sending the power module for detailed investigation.
Don't confuse F30002 with F30003.
Many customers put these two alarms together. F30002 is DC bus voltage too high and F30003 is DC bus voltage too low. One is eating up, one is not full. Although both are bus faults, troubleshooting the road can be far from it. If you use the undervoltage trick on the overvoltage, then half a day's investigation is also a waste of time.
