Can the rotary encoder be directly replaced Notes for replacement of rotary encoder

Rotary encoder replacement steps

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

　　The second step, loosen the encoder mounting screws

　　 The third step is to rotate the motor rotor shaft to make the mark on the encoder rotor coincide with the mark on the encoder shell

　　 The fourth step, remove the encoder, pay attention to use special screws when loading and unloading, to avoid damage to the encoder

　　The fifth step, rotate the new encoder to make the two signs of the encoder coincide

　　 The sixth step, install the encoder in the reverse order above

Precautions for replacing the rotary encoder

　　 1. In the process of installing the encoder, ensure that the rotor of the motor is different, otherwise the relative position of the rotor 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, and the new motor can judge the installation position of the encoder according to the mark on the rotor shaft of the motor. Parameter MD1016 is used to set an offset value, but this method can only be used on 840D.

　　 2. When changing the encoder, pay attention to the fact that after the encoder is installed with the fixing screws, the top wire on the coupling must be loosened and the jamming caused by the assembly stress must be eliminated.

3.It is necessary to pay attention to the wiring sequence of the encoder. If it is reversed, it may run over-current fault.

Rotary encoder replacement principle

Rotary encoders are now developing rapidly in China. In the past, we relied on imported rotary encoders from abroad. Now our domestically produced encoders can smoothly replace foreign rotary encoder brands to greatly save costs and delivery time. The following principles should be observed during the replacement process:

　　 1. The principle nature of the rotary encoder is divided into incremental encoder, absolute single-turn encoder, absolute multi-turn encoder, and special type encoder. Now most of the incremental encoders can be replaced (for example, GI60, HA78, etc.), which is not difficult, and absolute single-turn encoders with 17 bits (17Bit) or less can also be replaced with GMS412, GAS60, absolute value Multi-turn encoders can also be replaced below 28 bits (replace with GAX60 or GMX425). Generally, imported encoders will have "-500", "-512", "-600", "-1000", "-1024", "-2048" and other numbers on the label, most of which are incremental encoders , The above numbers are the number of output pulses; and the labels with "absolute" and "8", "10", "12", "13", "16" and "bit" on the label are mostly single-turn encoders; There are "absolute", "multiturn", and "1212", "1213", "24", "25", "26" and other words, most of which are multi-turn absolute encoders; or in some European brands, there are " S" is a single-turn encoder, and "M" in the model is a multi-turn encoder. (The type with "I" or the signal output with "A, B, Z" is an incremental encoder)

2. The shape of the installation is matched. The first shape is the flange installation form, including clamping flange, synchronization flange, shaft sleeve type, etc.; the second is the outer diameter size, and now the common ones are 58, 60, 65, 78, 90 (mm), etc. can be replaced, such as 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 which can already be replaced by domestic products; the third is the shaft diameter, which is actually easy to handle-it can be adjusted and installed through the aperture of the coupling.

3. The output matching of the signal, the incremental value has OC (open collector), RS422 (linedriver, differential long-line drive, TTL), push-pull (HTL, push-pull), etc., can be replaced, and the absolute value Encoders have parallel (Parallel, signal output lines are many), SSI serial (signal cables have clock+-, date+-), Canopen, Profibus-DP and other buses (signal cables have A, B, etc.), have also been found Replaced.

Universal signal output replacement: The encoder manufacturer can provide an intelligent signal output, which can output 4-20mA and RS485 signals at the same time. These two signals can find the corresponding connection interface on almost all PLCs, meters, and upper computers. The working range and resolution of the value encoder, single-turn or multi-turn, can be set as required. This kind of encoder is more convenient to replace the imported encoder if the user does not know the output of the imported encoder. It does not need to follow the original encoder output form, but can be used directly according to the actual application.

4. The resolution is equivalent. The imported incremental encoders mentioned above generally have "-500", "-512", "-600", "-1000", "-1024", "-2048" and other resolutions. , Especially in Europe, most of the inverters use 1024 lines, which can generally be replaced.