Speed Deviation Monitoring - Siemens SINAMICS G120D Operating Instructions Manual

Setting functions
8.7 Application-specific functions
8.7.8

Speed deviation monitoring

Speed deviation
Using this function, the inverter calculates and monitors the speed or velocity of a machine
component. The inverter analyzes an encoder signal, calculates a speed from the signal,
compares it to the motor speed and reports any excessive deviation between the encoder
signal and the motor speed.
Examples of how the function can be used:
● Gearbox monitoring for traction drives and hoisting gear
● Drive belt monitoring for fans and conveyor belts
● Blocking protection for conveyor belts
You require a transmitter for this function, e.g. a proximity switch. The inverter analyzes an
encoder signal at max. 32 kHz.
To use the function, you must connect the encoder to one of the digital inputs DI 1 or DI 2
and connect the relevant digital input with the function in the inverter.
Figure 8-27
The inverter determines the speed deviation from the calculated speed r0586 and the speed
list value r2169. p2181 determines the response of the inverter if the deviation is excessive.
Figure 8-28
174
Speed deviation monitoring
Time response of monitoring speed deviation
Converter with control units CU240D-2
Operating Instructions, 04/2014, FW V4.7, A5E34262100B AA