Tolerance Band Pulse Number" Monitoring - Siemens SINAMICS S120 Function Manual

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"Tolerance band pulse number" monitoring

The function extension "Tolerance band pulse number monitoring" monitors the number of

encoder pulses between two zero marks. An alarm is output if the number lies outside a

tolerance band that can be selected.

Commissioning the function

Carry out the following steps to start the function:

1. Set parameter p0437.2 = 1 to activate the monitoring.

2. Using parameters p4683 and p4684, set the upper and the lower limits of the tolerance

band. Within this tolerance band, the detected number of pulses is considered to be correct.

Further information on the procedure

● After each zero mark, it is again checked as to whether the number of pulses up to the next

zero mark lies within the tolerance band.

● Display of uncorrected encoder pulses

For p0437.7 = 1, the number of corrected pulse errors is displayed in r4688 with the correct

sign. Set p0437.7 = 0 in order to indicate the corrected pulse errors per zero mark distance

Drive functions

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

If the pulse number lies outside of the tolerance

band and the function "Pulse number correction

for faults" is parameterized via p0437.2 = 1, ...

If one of the limits has a value of 0, ...

If the tolerance band limit is not reached during a

drift after a revolution, ...

If the zero mark is exceeded; ...

8.21 Tolerant encoder monitoring

then alarm A3x422

is output for 5 seconds.

then alarm A3x4221) is deactivated.

an alarm is not output.

a new measurement is performed.

Basic functions