Advanced commissioning
7.7 Application-specific functions
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
p2179
Output load detection current limit (
factory setting: 0 A)
p2179 = 0: No load detection deactivated
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
p2175
Motor blocked speed threshold (
factory setting: 120 rpm)
p2175 = 0: Blocking protection deactivated
Motor blocked delay time (factory setting: 3 s)
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.
Motor stalled delay time (factory setting: 0.01 s)
Converter with control units CU240D-2
194 Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB
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