The output signal of an incremental encoder is a square wave signal, which can be categorized into two types: one with a commutation signal and the other being a conventional incremental encoder. The ordinary incremental encoder features two-phase orthogonal square waves, including pulse output signals A and B, along with a zero-bit signal Z. An incremental encoder with a commutation signal includes not only these ABZ output signals but also an electronic commutation signal UVW, where the phases of UVW differ by 120 degrees from each other. The number of cycles per revolution for UVW corresponds to the number of poles on the motor rotor. Aligning the phase of the UVW electronic commutation signal with the incremental encoder with the commutation signal and the rotor pole phase, or the electrical angle phase, involves the following steps:
1. Use a DC power supply to apply a DC current, less than the rated current, to the DC winding of the motor, setting U in and V out to orient the motor shaft to its equilibrium position.
2. Use an oscilloscope to observe the U phase signal and Z signal of the encoder.
3. Adjust the relative position of the encoder shaft and the motor shaft.
4. While making adjustments, monitor the U-phase signal edge of the encoder and the Z signal until the Z signal stabilizes at a high level (assuming the default Z signal is low), and lock the encoder’s positional relationship with the motor.
5. Manually reverse the motor shaft back and forth. If the motor shaft freely returns to the equilibrium position each time and the Z signal remains stable at a high level, the alignment is successful.
After removing the DC power supply, further verification can be done as follows:
1. Use an oscilloscope to observe the U phase signal of the encoder and the UV back EMF waveform of the motor.
2. Rotate the motor shaft such that the rising edge of the U-phase signal of the encoder coincides with the zero-crossing point of the UV back EMF of the motor, and ensure the Z signal of the encoder also appears at this zero-crossing point.
This verification method can also serve as an alignment method.
It's important to note that at this point, the phase zero point of the U-phase signal of the incremental encoder aligns with the phase zero point of the motor UV back-EM potential. Since the U-electrode potential of the motor differs from the UV-line back-EM potential by 30 degrees, after this alignment, the phase zero point of the U-phase signal of the incremental encoder aligns with the -30-degree phase point of the opposite potential of the motor U. Consequently, the phase angle of the motor electrical angle matches the phase of the potential waveform of the U opposite. Thus, during this alignment, the phase zero of the U-phase signal of the device aligns with the -30 degree point of the electrical phase angle of the motor.
Some servo companies prefer to directly align the zero point of the encoder’s U-phase signal with the zero point of the motor’s electrical angle. To achieve this, follow these steps:
1. Connect three resistors of equal value to form a star configuration, then connect the three resistors to the UVW three-phase windings of the motor.
2. Use an oscilloscope to observe the midpoint of the U-phase input of the motor and the star-shaped resistor to approximate the U-potential waveform of the motor.
3. Adjust the relative position of the encoder shaft and the motor shaft, or the relative position of the encoder housing and the motor housing, depending on operational convenience.
4. While adjusting, monitor the rising edge of the U-phase signal of the encoder and the zero-crossing point of the opposite potential waveform of the motor U from low to high, ensuring they eventually coincide. Lock the relative position relationship between the encoder and the motor to complete the alignment.
Since ordinary incremental encoders lack UVW phase information and their Z signals only reflect one point within a circle, there is no direct phase alignment potential and it will not be discussed here.
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USB Charger Socket
Function description
The socket is ordinary converter,with
two output 5V2A power USB power supply at the same time,can be very
convenient in use electrical appliances and recharge the equipment at
the same time,such as digital products like Iphone Ipad,MP3,MP4 etc.The
charge apply to full range of international AC output,no-load power
consumption less than 0.3W,with short circuit,overload,over-voltage
protection,can be convenient for your life and save more energy
Timer Control Time Adgustment
1.Press the power switch 1 time,the 1HOUR LED will light on.The Timer into ON mode,USB and control socket output ON .
2.Continuously press the power switch
the LED light on,the Countdown mode and LED light on will cycle change
from 1HR,2HR,4HR,6HR,8HR,10HR.
3.Choose you need countdown time
mode,the mode LED will lighto on,start countdown until countdown time
finish,the control output and USB change to OFF
4.Then the countdown is start,The Time indicate LED will from high to low auto change until Countdown finish off.
Failure analysis:
1.check whether the power supply connection is good
2.check whether the USB cable is loosen
Warning Note:
1.Use indoor and dry location ONLY
2.The load max does not exceed 15A 3600W
3.This product does not convert voltage please do not miss use DO NOT exceed the maximum loading of 3600 Watts 15A
4.Always have earth connection for safety reason
5.If in doubt please consult with a qualified electrician
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