Determining the 8KS order code

8KS motors are available in various sizes (8 or 8 and 9) depending on their construction. These different sizes are indicated by a number represented by (c) in the model number. The larger the number, the larger the flange dimensions and power rating for the respective motor.

8KS three-phase synchronous motors are available in four different lengths. These different lengths are indicated by a number represented by (d) in the model number.

Resolver

LTN resolvers are used in 8KS servo motors.

EnDat 2.1 encoder

EnDat is a standard developed by Johannes Heidenhain GmbH that incorporates the advantages of absolute and incremental position measurement while also offering a read/write parameter memory in the encoder. With absolute position measurement (the absolute position is sampled serially), a homing procedure for referencing is usually not required. Where necessary, a multi-turn encoder should be installed. To reduce costs, a single-turn encoder and a reference switch can also be used. In this case, a homing procedure must be carried out. The incremental process allows the short deceleration periods necessary for position measurement when using drives with highly dynamic characteristics. With the sinusoidal incremental signal and the fine resolution in the EnDat module, a very high positioning resolution is achieved in spite of the moderate signal frequencies used.

Different types of EnDat 2.1 encoders can be used depending on requirements:

EnDat 2.2 encoder – Safety-related position measurement systems

In machine and system manufacturing, the topic of safety is becoming more and more important. This is mirrored in legislation and stricter safety criteria in national and international standards. Most importantly, stricter requirements serve to protect personnel, but they also increasingly serve to protect property and the environment. The goal of functional safety is to minimize or eliminate dangerous situations that can occur in machines and systems either with or without operational errors. This is generally achieved by implementing redundant systems. Moving axes in safety-oriented applications require position information in order to be able to carry out their corresponding safety functions. Different system configurations can be implemented to get independent position values. One possibility is using two measuring instruments per axis. To keep costs down, the aim is often to create a solution with only one position measuring instrument. Until now, analog measuring instruments with sine/cosine signals were used for this purpose. The encoder manufacturer Heidenhain – as the first manufacturer with the purely serial EnDat 2.2 protocol for safety position measurement systems – offers a serial single-encoder solution in accordance with IEC 61 508 SIL2. All the advantages of serial data transfer – such as cost optimization, diagnostics possibilities, automatic commissioning and high-speed generation of position values – can now benefit safety applications as well.

100% inspection during production and additional measures during final testing ensure errors have not occurred related to shaft and coupling connections on rotary encoders when using motors with S encoders (in accordance with EN ISO 13849-2).

There are also a number of safety functions that are already possible with D encoders.

For information about the area of application and procedure for setting up the various safety functions, please refer to the SafeMOTION user's manual (MAACPMSAFEMC-ENG) in the Downloads section of the B&R website www.br-automation.com.

Technical data

EnDat 2.2 encoders can be used for functional safety in single-turn or multi-turn form, depending on requirements.

8KS three-phase synchronous motors can be delivered with different nominal speeds depending on the size and length.

The power connection for 8KS three-phase synchronous motors is generally made using terminal boxes. The position of the terminal box is "top" and the cable outlet is "right" (corresponds to 270°).

The motor version is automatically specified by the configurator and can be seen in the technical data.

A water-cooled 8KSJ three-phase synchronous motor with size92 is selected for the application. A multi-turn encoder with functional safety was chosen. The required speed is 2000 rpm. A brake is not required, the output shaft should have a keyway.

The code (ee) for the encoder system is S1.

The code (nnn) for a nominal speed of 2000 rpm is 020.

The option code (ff) for water-cooled 8KSJ motors is always "B". All 8KS motors are equipped with a terminal box (position on the top and cable channel outlet on the right, that corresponds to 270°). The no holding brake and shaft key options result in "1", so the option code is "B1"

No special options.

The model number for the required motor is 8KSJ92.S1020B100-0