This article we will talk about:
Siemens 840D spindle overheating in the end why it happens? How to troubleshoot? How to repair? Don't wait for a big problem to regret.
Why the Spindle Is Hot, The Whole Machine Problems?
Once the spindle temperature comes up, the impact is not just the motor:
* Processing accuracy will fall, thermal expansion and contraction caused by deformation and jitter.
* The equipment is prone to frequent alarms, and even cut off processing in the middle of the process.
* Bearing and motor life will be shortened significantly.
* In severe cases, it may cause drive overload or burnout.
Although Siemens 840D system is stable and durable, but if the cooling system has problems, or the parameters are not set reasonably, as usual, something will happen.
How Does the 840D Spindle System Actually Work?
Generally with 840D system spindle, behind usually have these key parts:
* Spindle motor (high speed, high precision).
* SINAMICS S120 drive module.
* Temperature sensors (e.g. PT100).
* Cooling system (both air-cooled and water-cooled).
You can simply understand: the drive controls the spindle's operating status, while monitoring the temperature through the sensor, once the temperature is abnormal, the system will alarm or shutdown. As long as one of these pieces fall off the chain, it may lead to overheating.
Why Does the Spindle Overheat?
In reality, the few reasons customers encounter the most are these:
* The fan is broken or the vent is blocked: this is the most common, too much dust, oil and dirt directly block the heat dissipation.
* Problems with the water cooling system: the water pump does not work, no water in the tank, the water pipe leaks.
* Bearing wear or lubrication dry: turn up resistance becomes bigger, heat faster.
* The load is too heavy, acceleration and deceleration is too fierce: the parameters in the program are set too aggressively.
* Temperature sensor is bad: no alarm does not mean it is not hot, sometimes it is not measured at all.
* The environment temperature is too high: for example, there is no air conditioner in the computer room in summer, or the ventilation is not good.
What Should I Check if It's Really Overheating?
You can do some basic troubleshooting on your own first, without having to call maintenance right off the bat:
Step 1: See if the cooling is broken first
** Is the fan spinning? Is it a pile of dust?
* Water-cooled look at the water pump, power supply, and if the coolant is flowing.
Step 2: on the system to see the real-time data
* Open the 840D interface to see if there is any abnormality in the motor temperature, load and current.
* Into the drive alarm record to see if there is F6000, F6031 and other fault codes.
Step 3: Check the motor body
* Touch the burnt flavor, listen to the bearings ringing.
* Infrared temperature gun or thermal imaging camera to see if there is a local hot spot.
Step 4: Look at the parameter set up reasonable or not
* Acceleration and deceleration time is too short or not.
* Current limit is too high or not.
* Thermal protection is open or not.
Problems Found, How to Repair?
The problem should be treated according to the symptoms, do not blindly replace the parts:
- Cooling problems: change the fan, unclog the air duct, replenish water, change the water pump.
- Bearing problems: obvious shaking or noise, it is recommended to dismantle the motor and replace the bearings.
- Drive setup problems: adjust the parameters, such as acceleration and deceleration time, current protection threshold, open the thermal protection option.
- Sensor problems: the temperature value jumps abnormally, has been stuck unchanged, to change the thermistor or PT100 probe.
- External environment problems: add an exhaust fan to the machine tool, or installed in an area with air conditioning operation.
What Kind of Situation Is It Recommended to Seek Professional Maintenance?
If you still can't get it right after checking it yourself, or if it alarms frequently or overheats repeatedly, then don't tough it out:
* After several repairs, it still overheats.
* SINAMICS driver keeps reporting errors.
* The motor has leakage or bad insulation.
* Not sure if the drive parameters are set correctly.
In these cases, we suggest you contact us Songwei, we have a specialized Siemens 840D test bench, which can simulate the state of on-site processing to check the problem, find out the real faults inside the spindle and drive, and reach the original performance standard after repair.
How to Avoid Overheating in the Future?
Here are a few empirical practices that are practical and simple:
* Clean the dust and wipe the fan every month, and the cooling lines are also passed through regularly.
* Record spindle temperature and load trend once a week.
* Long time no power on the system, before powering up the motor insulation measurement.
* Set up the temperature alarm and over-temperature automatic shutdown.
* Have a professional do a maintenance check regularly every six months or a year.
Write in the End
Siemens 840D control spindle overheating, to say big, to say small - deal with early, just clear the air ducts to change a fan; delayed for too long, you may burn the spindle, stop production, miss the big event. If you can check it by yourself, or if you can't do it, give it to us,
Songwei, we provide a full set of testing, repairing and refurbishing services for Siemens control system, motor, drive, etc. We can also test the new spare parts for you in advance, and make sure that they can work properly before shipment.
