How to Emergency Zeroing and Alignment of Encoders, with Methods

The emergency zeroing method is simple and practical. However, the motor must be removed from the device and relied on to perform the commissioning. After the trial and then put back into the equipment again can be. In fact, after a large number of zeroing tests, each has an angle of less than 10 degrees of zero-speed static area, and 350 degrees of high-speed reversal area, if you are occasionally replacing an encoder, this practice is really too much trouble, here is a very simple emergency method can also be quickly fixed.

Remove the damaged encoder, install a new one and fix it to the shaft. And make the adjustable base suspended and free to rotate, reconnect the motor to the circuit, set the machine speed to zero, after powering up the machine normally and pressing the start switch there are several things that can happen.

1, is the motor high-speed reversal, this is due to the encoder and the actual zero position is too large a difference caused by, do not panic, you can turn the encoder through an angle until the motor can be stationary down.

2, is the motor in the zero-speed instruction in a stationary state (state), then you can carefully first anti-clockwise rotation of the encoder, pay attention to: must be slow, until the motor began to high-speed reversal, write down the position at the same time immediately adjusted back to the stationary area (zone). Here requires two hands at the same time, one hand for the rotation, the other hand to hold a good marker, remember that the action must be fast, but also not panic, completely unnecessary, this is a normal phenomenon. Then press clockwise to continue to rotate slowly until the appearance of another high-speed reversal, note down the position and immediately back to the stationary zone.

Through the above adjustments, you will find that the incremental type actually has a wide adjustable area, and the middle position in this area is the maximum torque output point, if a motor torque is insufficient or positive and negative direction of operation there is a direction of insufficient torque is often due to the weakening of the encoder's Z signal or the position of the position due to the center, that is, the zero position has been deviated from the zero position, general readjustment of the zero position can be.

For a new encoder this stationary region is relatively small, such as a significant increase in the internal circuit of the encoder is a problem, manifested in the lack of torque or a significant increase in heat. Measured with an ammeter, the no-load current increases significantly.

After finding the center position and wiping the position clean, just fix the encoder base with 502 adhesive directly to the corresponding place on the side of the motor. To be 502 dry and then coated with a layer of silicone rubber on the machine can be put into normal operation. Practice has proved that, under normal circumstances, the use of such treatment after a year is no problem.

From the above adjustments can be seen, because the encoder shaft and the motor shaft can be connected at any angle, so the encoder zero position and the mechanical position of the motor is only a relative position, only the encoder shaft and the motor shaft is fixed, then the encoder's actual zero position will be fixed, if the movable base position is determined, then the position of the column head dowel between the shafts will also be fixed.