Rockwell Automation 193-EPRB Profibus Side Mount Module for the E1 Plus Overload Relay User Manual - Manual (Page 10)

Publication 193-UM010A-EN-P – January 2008
2-2 Protection Functions
event of a PROFIBUS Module failure. Settings for FLA and trip class are found directly on the
E1 Plus Overload Relay.
Overload Warning
The PROFIBUS Module continuously monitors the E1 Plus Overload Relay's percentage of
thermal utilization signal. Parameter 2,%Therm Utilized, provides this value.
Parameter 12, OL Warning Level, is used to adjust the setpoint to alert for an impending overload
trip and is adjustable from 0…100% TCU.
The PROFIBUS Module will indicate an overload warning if all the following conditions are
met:
• No warning currently exists
• Overload warning is enabled
• %Therm Utilized is equal to or greater than OL Warning Level
When the overload warning conditions are satisfied, the following will occur:
• Bit 0 in Parameter 4, Warning Status, will go to “1”
• Bit 1 of Parameter 5, Device Status, will go to “1”
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 PROFIBUS module allows jam trip and warning
capability.
Jam Trip
The following parameters are available for configuring the PROFIBUS Module's jam trip
performance:
• Parameter 13, 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 14, 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 0.5…25.0 seconds.
• Parameter 15, 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.
IMPORTANT
The reset mode DIP switch adjustment is overridden by the PROFIBUS
module parameter 11, OL Reset Mode, while the PROFIBUS module is
powered.
IMPORTANT
%Therm Utilized will stabilize at a value of approximately 88% with the
motor operating continuously at rated current.