Advanced commissioning
7.8 Application-specific functions
Converter with control units CU250D-2
250 Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
Stall protection
Principle of operation
If the value in r1746 exceeds the value of p1745 for the time set in p2178, using bits 7 of
status word 2, for monitoring functions (r2198.7) the converter outputs the "Motor stalled"
message.
Applications: General system protection
p1745
Motor model fault threshold value stall detection (
factory setting: 5 %)
If the motor stalls too early with this setting, then using the trace function you have
the option of determining a better value. To do this, set p1745 = 100.
p2178
(factory setting: 0.01 s)
The load monitoring comprises the following components:
● Load failure monitoring
● Monitoring for torque deviation
● Speed deviation monitoring
If the load monitoring detects load failure, then the converter always goes into a fault
condition and outputs fault F07936. For a torque and speed deviation, as response, you can
either set an alarm or a fault. Details are provided in the following descriptions.
Table 7- 30 Setting options for load monitoring
p2193
Load monitoring configuration
(factory setting: 1)
0: Monitoring deactivated
1: Torque and load failure monitoring
2: Speed and load failure monitoring
3: Load failure monitoring
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