Can the rotary encoder be replaced directly? Precautions for replacing the rotary encoder

The first step is to remove the motor back cover and the encoder back cover.

Step 2: Loosen the encoder mounting screws.

The third step is to rotate the motor rotor shaft so that the mark on the encoder rotor coincides with the mark on the encoder housing.

Step 4: Remove the encoder. Pay attention to use special screws to push it out during installation and removal to avoid damaging the encoder.

Step 5. Rotate the new encoder so that the two marks on the encoder coincide.

Step 6. Install the encoder in the reverse order of the above steps.

Notes on Rotary Encoder Replacement

1. During the installation of the encoder, ensure that the motor rotors are different, otherwise the relative position of the rotors will be lost. If the relative position is lost, the old motor needs to use an oscilloscope to adjust the installation position of the encoder, while the new motor can be adjusted according to the mark on the motor rotor shaft. When adjusting the installation position of the encoder, you can adjust it mechanically or adjust the drive parameter MD1016 to set an offset value, but this method can only be used on 840D.

2. When replacing the encoder, please note that after the encoder is installed with the fixing screws, be sure to loosen the top screw on the coupling to eliminate the jamming caused by assembly stress, and then tighten the top screw after it can be turned flexibly by hand.

3. Pay attention to the wiring sequence of the encoder. Reversing the wiring sequence may cause overcurrent faults.

Rotary encoder replacement principles

Rotary encoders are now developing rapidly in China. In the past, they relied on imported rotary encoders from abroad. Now our domestic encoders can smoothly replace foreign rotary encoder brands to greatly save costs and delivery time. In the process of replacing rotary encoders, we should pay attention to the following principles:

1. The principle and nature of rotary encoders are divided into incremental encoders, absolute single-turn encoders, absolute multi-turn encoders, and special type encoders. Most incremental encoders can now be replaced (for example, with GI60, HA78, etc.), and the difficulty is not great. Absolute single-turn encoders with less than 17 bits (17 bits) can also be replaced with GMS412, GAS60, and absolute multi-turn encoders with less than 28 bits can also be replaced (with GAX60 or GMX425). Generally, the labels of imported encoders will have numbers such as "-500", "-512", "-600", "-1000", "-1024", "-2048", etc. Most of them are incremental encoders, and the above numbers are the output pulse numbers; and the labels have "absolute" and "8", "10", "12", "13", "16", "bit", etc., most of them are single-turn encoders; and the labels have "absolute" and "multiturn", and words such as "1212", "1213", "24", "25", "26", etc., most of them are multi-turn absolute encoders; or in some European brands, the model with "S" is a single-turn encoder, and the model with "M" is a multi-turn encoder. (The model with "I" or the signal output with "A, B, Z" is an incremental encoder)

2. The installation matches the appearance. In terms of appearance, one is the flange installation form, which includes clamping flange, synchronous flange, shaft sleeve type, etc.; the second is the outer diameter size. Now the common ones are 58, 60, 65, 78, 90 (mm), etc., and replacements can be found. For example, among the imported encoder models, XXM58 (such as AVM58), (such as AC58), XXS58 (such as FVS58), XXI58 (such as AVI58), XXS60, XXM60, XX65 (such as CE65), XXX90, etc., most of them can be replaced by domestic products; the third is the shaft diameter, which is actually easy to do - the installation can be adjusted through the aperture of the coupling.

3. Signal output matching: Incremental encoders include OC (open collector), RS422 (linedriver, differential long line driver, TTL), push-pull (HTL, push-pull), etc., all of which can be replaced. Absolute encoders include parallel (Parallel, with many signal output lines), SSI serial (signal cables include clock+-, date+-), Canopen, Profibus-DP and other buses (signal cables include A, B, etc.), all of which have been replaced.

Universal signal output replacement: Encoder manufacturers can provide an intelligent signal output, outputting 4-20mA and RS485 signals at the same time. These two signals can find corresponding connection interfaces on almost all PLCs, instruments, and host computers, and the working range and resolution of the absolute encoder can be set as needed, single-turn or multi-turn. This encoder is designed for users who do not understand the output of imported encoders. It is more convenient to replace imported encoders. It does not need to follow the original encoder output form, but can be used directly according to actual applications.

4. The resolution is equivalent. The imported incremental encoders mentioned above generally have resolutions such as "-500", "-512", "-600", "-1000", "-1024", and "-2048". In particular, most European frequency converters use 1024 lines, which can generally be replaced.