150 Rockwell Automation Publication 193-UM015D-EN-P - February 2015
Chapter 6 Protective Trip and Warning Functions
Table 184 - Stall Trip Level (Parameter 250)
Jam Protection
A motor goes into a jam condition when a running motor begins to consume
current greater than50% of the motor’s nameplate rating. An example of this
condition could be an overloaded conveyor or jammed gear. These conditions
can result in the overheating of the motor and equipment damage. The E300
Electronic Overload Relay can monitor for this condition with its Jam Trip and
Warning function to detect for a rapid jam fault to minimize damage and loss of
production.
Jam Inhibit Time
Jam Inhibit Time (Parameter 251) allows you to inhibit a jam trip and warning
from occurring during the motor starting sequence. It is adjustable from 0…250 s.
Table185‐JamTripInhibitTime(Parameter251)
Stall Trip Level (Parameter 250)
Default Value 600
Minimum Value 100
Maximum Value 600
Parameter Type UINT
Size (Bytes) 2
Scaling Factor 1
Units %FLA
Stall Protection is only enabled during the motor starting sequence. If the
maximum phase of load current falls below the programmed Stall Trip Level
before the Stall Enabled Time elapses, the E300 Electronic Overload Relay
disables Stall Protection until the next motor starting sequence.
The E300 Electronic Overload Relay considers a motor to have begun its
starting sequence if the maximum phase of motor current transitions from 0A
to approximately 30% of the minimum FLA setting of the device.
Default Value 10
Minimum Value 0
Maximum Value 250
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units Seconds
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