Monitoring and protective functions 8.5 Thermal motor protection

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Figure 8-2 Stall protection

Function diagrams (see SINAMICS S List Manual)

6730 Current control

8012 Torque messages, motor blocked/stalled

Overview of key parameters (see SINAMICS S List Manual)

r1408 CO/BO: Control status word 3

p1744 Motor model speed threshold stall detection

p1745 Motor model fault threshold value stall detection

p1755 Motor model without encoder, changeover speed

p1756 Motor model changeover speed hysteresis

p2178 Motor stalled delay time

8.5Thermal 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.

Effective protection is also possible without a temperature sensor (p4100 = 0). The temperatures of different motor components (stators, core, rotors) can be determined indirectly using a temperature model.

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.

Drive Functions

295

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

Page 295
Image 295
Efficient Networks S120 manual Thermal motor protection, 0RWRUVWDOOHG