SPINDLE INFO


 Dear customers, first of all we want to thank you for choosing our products. There are some important points that we want to remind you in order to take care before you start operating your motor.
• Before making the electrical connections please read the technical label on the spindle carefully. Firstly decide the type of the connection – star or delta – then make the suitable connection. ( for only 6 wires models ) If your spindle is 3 wires you can connect the inverter (AC motor driver) unit directly which is adjusted according to the voltage and the frequency values written on your motor. ( Detailed technical information about the inverter parameter settings is going to be given below ) If your spindle is a 6 wires model with the voltage value of 220/380 written on its technical label, you may need to change the connection into star or delta type according to the suitable value of your inverter’s output power. If your speed inverter’s input is mono-phase the connection should be delta, if it is three-phase then the connection should be star. Exceptionally, there may be need of delta connection besides 380 voltage value for our rare models. In this case; you should use delta type connection as it is written on the motor’s technical label with the inverter which has three-phase input. Below you can see at Figure 1, the connection configuration for a spindle which has the technical value of 220/380 Voltage & 300 Hz on its technical label.

 


• After making the electric connections to your motor, you should adjust the parameter settings of your inverter in order to make it suitable for working with your motor. Although, the parameter settings of the inverters can differ according to their brand marks or models, in general the same logic is default for the most. For the AREL spindles, the maximum voltage (name plate voltage) should only be applied to the spindle only when it reaches to it is nominal (name plate) frequency. When the frequency applied is lower than the nominal frequency, the voltage applied should be decreased by direct ratio. When the frequency applied is higher than the nominal frequency, the maximum voltage (name plate voltage) should be used. This situation can be seen at Figure 2 below. If the nominal voltage of the motor is applied before it reaches to its nominal frequency (this is a very a frequently done error), the current of the spindle will get higher than its maximum current, and the windings can be damaged if the situation is not avoided by the inverter’s over current protection facility.

 



• Start to operate your spindle with a frequency lower than its nominal (for example; 25 Hz), after the necessary adjustments done for the inverter unit. And please check if the rotation direction is correct or not. Principally, the rotation direction is not very important for your spindle motor but it has to rotate at the direction of arrow in order to avoid the equipment like collet nut or milling cutter to be untightened during the process. If the rotation direction is not correct please stop the spindle and cut the connection between the inverter unit and the mains, change the location of any other 2 cables of the total 3 cables which you have connected on the motor before. By this way; your spindle will be able to change its rotation direction. You can do the same operation by the help of the inverter unit’s programming option. (The programming properties may differ according to the inverter unit’s brands.)

• Please check the ampere by the help of the indicators on the inverter unit or another ammeter with a low frequency after being sure that your spindle motor is rotating in the correct direction. The ampere value which you read should not be more than a half of the ampere value which is written on the technical label. If it is more than the ampere value which is written on the technical label, you have to stop operating the motor and check the parameter settings of the inverter unit.


• Please operate your spindle motor firstly at a lower Rpm before starting to work at your machining Rpm. By doing like this; you will help the oil inside the ball bearing to get warm and to spread inside of it. As a result, the life of the ball bearing will be longer. Especially it will be very harmful for the ceramic ball bearings if you operate these types of spindle motors at higher Rpm when the ball bearings are cold at the beginning. For this reason, it would be better if you operate your spindle motor at lower Rpm before working with your machinery at the early morning.

• Tools without balance, collision or impacts at your process will harm your spindle motor. So; you have to be selective while buying your tools and choose the ones which are suitable for your manufacture process. Set out the speed and feed rate of your machinery according to the advices of the tool manufacturer. The unnecessary high feed rate will cause the tool to move faster without cutting properly during the process and this will cause an additional problem as; radial overload for the ball bearings of the spindle motors. This situation will harm both of your tools and ball bearings. And also, working with rusty tool which is not sharp enough is harmful too.


• There is an important point which most of the machinery manufacturers forget: If the inverter unit which is connected to the spindle motor has stopped because of any malfunction, the control system must stop the all machinery automatically. Otherwise; the spindle motor will continue to move on the material as it is still cutting even if it is not operating at all. And this will cause a lot of mechanical problems.


• There is a very important point which has to be considered at our automatic tool changer models: There should not be tool change signal for any reason caused by the operator or by the machinery as conscious or unconscious while spindle is rotating. It will cause a big damage for your spindle and an important safety problem for the operator if there will be any try to change the tool while spindle is operating. If your spindle has a speed sensor, you should introduce the output signal of the sensor to your control system, in order to restrict tool changing while spindle is rotating. If your spindle does not have a speed sensor, the most practical way to avoid this unpleased situation is; to make the wires out of service which are related to the tool changer system while the spindle is operating on, by the help of the relay that you used for giving start signal to your inverter. By this way, you will be able to avoid any tool change possibility which can be caused by the operator’s abstraction or any program based error. If it is considered that; the spindle motor stops after a few seconds later then the stop signal’s coming to the inverter unit, it will be better to use a time relay in order to adjust the timing of the signal which is going to the tool changer wires for being able to be in charge after the stop signal.


Dear Customers,
We wanted to share some important technical points with you which we have gained as a result of our long term experience over years. We hope, these will help you and assist professionally during your manufacture process at any time you need. For any other technical questions, please do not hesitate to contact with our company.

Best Regards
Hakan ARCAĞ
Mechanical Engineer & Electronic Technician

 

 

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