Siemens SINAMICS S120 Function Manual page 403

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Example: Pulses per revolution with several zero positions

If the original encoder has several zero positions/marks per revolution (e.g. resolver with

several pole pairs), the correct zero mark must be selected via an additional condition.

Otherwise, there is no reproducible relationship between the position of the original encoder

and the zero mark position of the encoder emulation.

Step-up ratio with several zero positions per revolution

Configuring the function

The pulse numbers of the leading encoder (the signal source) are set using p4408 and p4418.

To synchronize the generated zero mark with the zero mark of the leading encoder, the pulse

number per encoder revolution of the encoder at the TM41 input (p4408) must always precisely

coincide with the pulse number per encoder revolution of the encoder interconnected at

connector input p4420.

The pulse numbers emulated by the TM41 are set using p0408 and p0418. If p4408 = 0 is set

then the values from p0408 and p0418 also apply for the output of the TM41.

Diagnostic options

Parameter r4419 shows the calculated position setpoint after the step-up/step-down. Using the

trace function of the Startdrive commissioning tool, you can check the step-up/step-down

function based on r4419.

Enabling the zero mark output of the TM41

For p4401.1 = 1, the zero mark from the leading encoder is also output from the TM41. For

p4401.1 = 0, TM41 outputs the zero pulse at the position at which the TM41 was located when

switching on.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Basic functions

8.25 Terminal Module 41