Stall Protection; Thermal Motor Protection - Siemens SINAMICS S120 Installation And Start-Up Manual

Basic Information about the Drive System
Monitoring and protective functions
7.9.4

Stall protection

Description
If a stalled drive is detected (p1408.12 set), fault 7902 is output after the delay time
set in P2178.
EMF error
r1408.11
Motor stalled
r1408.12
Fig. 7-16 Stall protection
Function diagram for stall protection
S 8012
Parameters for stall protection
S p2178
7.9.5

Thermal motor protection

Description
The priority of thermal motor protection is to identify critical situations. If alarm
thresholds are exceeded, the user can set parameterizable response options
(p0610) that enable continued operation (e.g. with reduced power) and prevent
immediate shutdown.
S Effective protection is also possible without a temperature sensor (p4100 = 0).
The temperatures of different motor components (stators, core, rotor) can be
determined indirectly using a temperature model.
S Connecting temperature sensors allows the motor temperature to be
determined directly. In this way, accurate start temperatures are available
immediately when the motor is switched on again or after a power failure.
7-266
≥1
p2178 (0.010)
0.000..0.1.000 s
Torque messages, motor blocked/stalled
Motor stalled delay time
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Motor stalled
T 0
r2198.7
F7902
On delay
E Siemens AG, 2004. All rights reserved