Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual - Manual (Page 58)

58 Rockwell Automation Publication 193-UM002I-EN-P - December 2011
Chapter 3 Protective Trip & Warning Functions
Jam Trip Level, Parameter 43, allows the installer to define the current at which
the E3 Overload Relay will trip on a jam. It is user-adjustable from 50…600% of
the FLA Setting, Parameter 28.
Jam Warning
The E3 Overload Relay will indicate a Jam warning if:
• no warning currently exists,
• Jam Warning is enabled,
• Jam Inhibit Time has expired, and
• the maximum phase current is equal to or greater than the JamWarn Level.
When the Jam Warning conditions are satisfied, the:
• TRIP/WARN LED will flash an amber 6-blink pattern,
• bit 5 in Parameter 15, Warning Status, will set to “1”, and
• bit 1 in Parameter 21, Device Status, will set to “1”.
Jam Warn Level, Parameter 44, allows the installer to define the current at which
the E3 Overload Relay will indicate a warning. It is user-adjustable from
50…600% for the FLA Setting, Parameter 28.
Underload Protection
Motor current less than a specific level may indicate a mechanical malfunction in
the installation, such as a torn conveyor belt, damaged fan blade, broken shaft, or
worn tool. Such conditions may not harm the motor, but they can lead to loss of
production. Rapid underload fault detection helps to minimize damage and loss
of production.
Underload Trip
The E3 Overload Relay will trip with an underload indication if:
• no trip currently exists,
• Underload Protection is enabled,
• UL Inhibit Time has expired, and
IMPORTANT The Jam Inhibitor timer starts after the maximum phase of load current
transitions from 0 A to 30% of the device’s minimum FLA setting. The E3
Overload Relay does not begin monitoring for a jam condition until the
Jam Inhibit Time expires.
IMPORTANT The Jam Warning function does not include a time delay feature. Once
the Jam Inhibit Time has expired, the Jam Warning indication is
instantaneous.