Siemens SINAMICS G120 Instructions d'exploitation télécharger pdf (Page 215)

Functions

7.9 Application-specific functions

Inverter with CU240B-2 and CU240E-2 Control Units

Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

213

7.9.6 Speed and load failure via digital input

With this function you can directly monitor not only the motor speed but also the speed of the

driven load. Examples include:

● Gearbox monitoring, e.g. in traction drives or hoisting gear

● Drive belt monitoring, e.g. in fans or conveyor belts

● Monitoring for blocked driven load

Speed or velocity monitoring functions

There are two ways of directly monitoring speed in your application:

1. Load failure monitoring: The inverter evaluates whether the sensor signal is present.

2. Speed deviation monitoring: The inverter calculates a speed from the signal of the

connected sensor and compares it with the internal motor control signal.

A sensor (e.g. a proximity switch) is required for speed monitoring. The inverter evaluates

the sensor signal via a digital input.

Load failure monitoring

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Figure 7-21 Load failure monitoring by means of a digital input

Table 7- 47 Setting load failure monitoring

Parameter Description

p2193 = 1 to 3 Load monitoring configuration (factory setting: 1)

0: Monitoring is disabled

1: Torque and load failure monitoring

2: Speed and load failure monitoring

3: Load failure monitoring

p2192 Load monitoring delay time (factory setting 10 s)

If, after the motor is switched on, the "LOW" signal is present on the associated

digital input for longer than this time, a load failure is assumed (F07936)

p3232 = 722.x Load monitoring failure detection (factory setting: 1)

Interconnect the load monitoring with a digital input of your choice.

For more information, see the List Manual (the parameter list and function diagram 8013).

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Siemens SINAMICS G120 Instructions d'exploitation Page 215