7.7.7
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
Speed monitoring requires a binary sensor (e.g. a BERO), the output signal from which is
evaluated as a pulse sequence by a digital input on the inverter.
Load failure monitoring
Figure 7-6
If you parameterize the function of a digital input for load failure monitoring (P070x = 50), you
automatically interconnect this input to signal evaluation via BICO technology.
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
connected sensor and compares it with the internal motor control signal.
Load failure monitoring by means of a digital input
Functions
7.7 Protection functions
183