Siemens SINAMICS G110M - System Protection; No-Load Monitoring, Blocking Protection, Stall Protection

Functions
8.9 Application-specific functions
SINAMICS G110M Operating Instructions
236 Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
8.9.7
System Protection
In many applications, monitoring the motor speed and torque provides information about the
plant or system status. By setting the appropriate responses in the case of faults, failures
and damage to the plant or system can be avoided.
Examples:
● For fans or conveyor belts, an excessively low torque can mean a broken drive belt.
● For pumps, an excessively low torque down to zero speed can mean an inadmissible
operating state.
● For extruders and mixers, excessively high torque can mean overload or a blocked
machine.
System protection functions
The inverter offers the following options of monitoring the motor load torque and speed:
● No-load monitoring
● Blocking protection
● Stall protection
● Load monitoring
No-load monitoring, blocking protection and stall protection require just a few settings.
However, the load monitoring is a function that offers a wide range of different setting options
– which in turn demands that you have good knowledge of the system.
8.9.7.1
No-load monitoring, blocking protection, stall protection
No-load monitoring
Principle of operation
If the motor current is below the value of p2179 for the time set in p2180, using bit 11 of
status word 1 for monitoring functions (r2197.11), the converter outputs the "Output load not
available" message.
Applications: Fans and conveyor belts
Settings
Parameters
Description
p2179
Output load detection current limit (
factory setting: 0 A)
p2179 = 0: No load detection deactivated
p2180
Output load detection delay time
(factory setting: 2000 ms)