Siemens CU240B-2 Operating Instructions

6.31.1 Stall 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
6.31.2 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
0
Q
Advanced commissioning
6.31 Monitoring the driven load
Converter with the CU230P-2 Control Units
334 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE

Siemens CU240B-2 Specifications

General

Brand	Siemens
Model	CU240B-2
Category	Inverter
Language	English