Advanced commissioning
7.8 Application-specific functions
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
249
7.8.5.1
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)
Stall protection
Principle of operation
If the speed lies below the value of p2175 for the time set in p2177, and the converter is
operating at the current or torque limit, using bit 6 of status word 2 for monitoring functions
(r2198.6), the converter outputs the "Motor blocked” message.
The converter goes to the current or torque limit if the setpoint speed is significantly higher
than the actual speed.
Applications: Extruders and mixers
Settings
Parameters
Description
p2175
Motor blocked speed threshold (factory setting: 120 rpm)
p2175 = 0: Blocking protection deactivated
p2177
Motor blocked delay time (factory setting: 3 s)