Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 129)

SMC Dialog Plus Controller Special Application Considerations 5-5
Stall Protection and
Jam Detection Motors can experience locked rotor currents and develop high torque
levels in the event of a stall or a jam. 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 protection delay time from 0 to 10
seconds. The stall protection delay time is in addition to th
programmed start time and begins only after the start time has timed
out.
Jam detection allows the user to determine the motor jam detection
level as a percentage of the motor’s full load current rating. To
prevent nuisance tripping, a jam detection delay time, from 0.0 to
10.0 seconds, can be programmed. This allows the user to select the
time delay required before the SMC Dialog Plus controller will trip
on a motor jam condition. The motor current must remain above th
jam detection level during the delay time. Jam detection is active
only after the motor has reached full speed.
Built-in SCANport
Communications A serial interface port, the SCANport, is furnished as standard on the
SMC Dialog Plus controller. The SCANport allows for connection to
a Bulletin 1201 Human Interface Module or a variety of Bulletin 1203
communication modules. Utilizing the built-in communication
capabilities, the user can remotely access parameter settings, fault
diagnostics, and metering. Remote start-stop control can also b
performed.
When used with the Bulletin 1203 communication modules, the SMC
Dialog Plus controller offers true networking capabilities with several
network protocols, including Allen-Bradley’s Remote I/O, DeviceNet
network, DH-485, and RS 232/422/485-DF1.