Siemens bt300 Operator's Manual page 77

Stall time limit (P3.9.13)
This time can be set between 1.0 and 120.0s.
This is the maximum time allowed for a stall stage. The stall time is counted by an internal up/down counter.
If the stall time counter value goes above this limit, the protection will cause a trip (see
Protection
'[P3.9.11]).
Under-load protection (P3.9.15 through P3.9.18)
The motor under-load protection ensures that there is load on the motor when the drive is running. If the motor
loses its load, there might be a problem in the process (for example, a broken belt or a dry pump).
Motor under-load protection can be adjusted by setting the under-load curve with Field Weakening Area Load
(P3.9.16) and Zero Frequency Load (P3.9.17). The under-load curve is a squared curve set between the zero
frequency and the field weakening point. The protection is not active below 5 Hz (the under-load time counter is
stopped).
Siemens Industry, Inc.
Building Technologies
Figure 20: Stall characteristics settings.
Figure 21: Stall time count.
Siemens BT300 HVAC Drive
Chapter 4 - Parameters and Menu Structure
Parameters (M3)
Parameters of Stall
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DPD01809
2016-06-07