Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 43)

3-6 SMC Dialog Plus Smart Motor Controller
Features (cont.) Stall Protection and Jam Detection
Motors can experience locked rotor currents and develop maximum
torque in the event of a stall (during start) or a jam (after full speed is
reached). These conditions can result in winding insulation
breakdown or mechanical damage to the connected load.
The SMC Dialog Plus controller provides both stall and jam detection
for enhanced motor and system protection. Stall protection allows the
user to program a maximum stall time of up to 10 seconds. Jam
detection allows the user to determine the jam level as a percentage o
the motor’s full load current rating, and a trip delay time of up to 10
seconds.
Note: The stall trip delay time is in addition to the programmed
start time.
Figure 3.7 Stall Protection
Figure 3.8 Jam Detection
Stall
60 0
Percent
Full
Load
Current
Time (seconds)
Programmed Start Time
100%
Running Jam
Percent
Full
Load
Current
Time (seconds)
User Programmed Trip Level