Advanced commissioning
6.21 Monitoring the driven load
Converter with the control units CU240D-2
232
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
6.21.1
Breakdown protection
If the load of a standard induction motor exceeds the stall torque of the motor, the motor can
also stall during operation on the inverter. A stalled motor is stationary and does not develop
sufficient torque to accelerate the load.
If the "Motor model fault signal stall detection" r1746 for the time p2178 is present via the
"Motor model error threshold stall detection" p1745, the inverter signals "Motor stalled" and
fault F07902.
Parameter
Description
r1408
Current controller status word
r1408.12 = 1: Motor stalled
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.
r1746
Motor model fault signal stall detection [%]
p2178
Motor stalled delay time (factory setting: 0.01 s)
r2198
Status word monitoring 2
r2198.07 = 1: Motor stalled
6.21.2
No-load monitoring
In applications with fans, compressors or conveyor belts, an insufficient motor current
indicates that the power transmission from the motor to the load is interrupted.
If the motor current for the time p2180 lies below the current level p2179, the inverter signals
"output load not available" and alarm A07929.
Parameters
Description
r0068
Actual current value [A]
[0] = Unsmoothed
[1] = Smoothed with p0045
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)
r2197
Status word, monitoring functions 1
r2197.11 = 1: Output load not available
