Rockwell Automation 193-ETN E1 Plus EtherNet Side Mount Module User Manual - Manual (Page 15)

Rockwell Automation Publication 193-UM012B-EN-P - June 2011 15
Chapter 2
Jam Protection Motor current greater than the motor's nameplate rating can indicate a high
overload or stall condition, such as an overloaded conveyor or jammed gear.
These conditions can result in overheating of the motor, and equipment damage.
Rapid jam fault detection helps to minimize damage and loss of production.
By continuously monitoring the motor current level signal as a percentage of the
E1 Plus Overload Relay's dial FLA setting, the E1 Plus EtherNet/IP module
allows jam trip and warning capability.
Jam Trip
The following parameters are available for configuring the E1 Plus EtherNet/IP
Module's jam trip performance:
• Parameter 18, Jam Inhibit Time, allows the installer to inhibit a jam trip
from occurring during the motor starting sequence. It is adjustable from
0…250 seconds.
• Parameter 19, Jam Trip Delay, allows the installer to define the time period
a jam condition must be present before a trip occurs. It is adjustable from
5…250 seconds.
• Parameter 20, Jam Trip Level, allows the installer to define the current at
which the E1 Plus Overload Relay will trip on a jam. It is user-adjustable
from 150…600% of the FLA dial setting.
The E1 Plus EtherNet/IP Module will command the E1 Plus Overload Relay to
trip if all the following conditions are met:
• No trip currently exists
• Jam Protection is enabled
• Jam Inhibit Time has expired
• The motor current is greater than the Jam Trip Level for a time period
greater than the Jam Trip Delay
When the conditions for a jam trip are satisfied, the following will occur:
• Bit 2 in Parameter 3, Trip Status, will go to “1”
• Bit 0 in Parameter 10, Device Status, will go to “1”
• The E1 Plus Overload Relay's trip relay contacts (95 and 96) will open
• Out A will be placed in their Protection Fault State (if so programmed)
IMPORTANT The Protection Fault State of OUT A is defined by parameter 34 (OUTA
Pr FltState) and parameter 35 (OUTA Pr FltValue).
IMPORTANT The jam inhibit timer starts after the load current transitions from 0 A
to 30% FLA. The E1 Plus EtherNet/IP Module does not begin
monitoring for a jam condition until the Jam Inhibit Time expires.