To Next PageTo Next PageHow to troubleshoot trip test failure for Allen-Bradley LSIG Circuit breakers?
The trip test for Allen-Bradley Circuit breakers might fail due to several reasons: * If the busbar current is greater than 0, normal operation (FN) is suggested. * If the TC is not connected, check the TC connection. * If the battery unit is not connected, connect the battery unit.
What to do if Allen-Bradley LSIG trip rapidly with I3=Off?
If your Allen-Bradley Circuit breakers trip rapidly when I3 is off, it's likely due to an instantaneous trip (Iinst). This typically indicates a phase-to-neutral (FN) short-circuit with high current. The suggested solution is normal operation (FN) short-circuit with high I.
Why Allen-Bradley LSIG Circuit breakers trip times are higher than expected?
If your Allen-Bradley Circuit breakers are tripping slower than expected, several factors could be at play: * The threshold might be set too high; you should correct the threshold. * The curve setting may be too high; adjust the curve accordingly. * If the curve type is set to "t=k/I2", consider changing it to "t=k". * Incorrect neutral selection may also be the cause; ensure correct neutral adjustment.
Why Allen-Bradley LSIG Circuit breakers trip times are lower than expected?
If the trip times for your Allen-Bradley Circuit breakers are faster than expected, it could be due to a few reasons: * The threshold might be set too low, so you should correct the threshold. * The curve setting may be too low; adjust the curve accordingly. * An incorrect neutral selection could also be the cause; ensure correct neutral adjustment.
What to do if Allen-Bradley LSIG Circuit breakers expected trip does not happen?
If an expected trip does not occur with your Allen-Bradley Circuit breakers, it is possible that the function is turned off. The solution is to enable the protection function (FN).
General| Category | Circuit Breakers |
|---|---|
| Brand | Allen-Bradley |
| Description | Electronic trip circuit breaker with Long-time, Short-time, Instantaneous, and Ground-fault protection |
| Protection Functions | Long-time (L), Short-time (S), Instantaneous (I), Ground-fault (G) |
| Voltage Rating | Typically 600V AC or higher, depending on model |
| Current Rating | Varies by model (e.g., 15A to 5000A) |
| Breaking Capacity | Varies by model and voltage rating |
| Standards | UL, IEC |
Disconnect power before installation/servicing to prevent electrical shock.
Details compatibility between LSIG/LSIG-MM trip units and circuit breakers.
Lists and defines abbreviations used in the document.
Crucial safety information and notes for dielectric tests.
Basic introduction, main specifications, and components of the LSIG trip unit.
Lists the protection capabilities of the LSIG trip unit.
Describes the various functions integrated into the LSIG trip unit.
Details compatibility with circuit breakers and relevant international standards.
Outlines operating conditions and electrical power requirements.
Describes the physical interface, including dip switches for configuration.
Explains the meaning of LEDs and the functionality of the iTest button.
Details the test connector and introduces protection functions.
Provides a high-level introduction to protection functions.
In-depth explanation of the L, S, I, and G protection functions.
Configuration for neutral protection and instantaneous short-circuit protection.
Comprehensive table summarizing all protection functions.
Illustrates trip curves for L-S functions with different time settings.
Covers measurement capabilities and self-testing features.
Guides on installation, connections, checks, and default settings.
Provides solutions for common issues and guidance for faulty units.
Introduces the LSIG-MM unit, its interface, and general specifications.
Details the protection types and operational functions of the LSIG-MM unit.
Covers CB compatibility, standards compliance, and environmental/electrical traits.
Describes the display, LEDs, and their meanings.
Explains the function of push-buttons and the display's operating modes.
Details the graphic ammeter display and alarm messages.
Describes operating icons and how to access user menus.
Explains the menu tree structure and how to navigate and edit parameters.
Covers general protection operation notes and detailed explanation of Protection L.
Details thermal memory functions, Protection S, and start-up threshold.
Explains Protection I and Protection G.
Explains Protection G, U (Unbalance), and T (Temperature).
Covers Load Control, Neutral Protection, MM, and linst protections.
A comprehensive table summarizing all protection functions, thresholds, and times.
Illustrates trip curves for L-S functions with different time curve settings.
Displays trip curves for function L according to IEC 60255-121 standards (Types A, B).
Shows trip curves for function L (IEC 60255-121 Type C) and function G.
Details runtime measurements for currents and their operational tolerances.
Covers trip logs, event recording, and the measurements log register.
Details peak factor measurement and contact wear monitoring.
Explains watchdog functions, CB state monitoring, and Function MM.
Details settings for circuit-breaker, network frequency, and measurement interval.
Covers system settings like language/password and display contrast.
Covers system settings like language/password.
Covers display contrast adjustment.
Guides on performing unit tests.
Provides procedures for installation, uninstallation, and connection guidelines.
Lists the default parameters for protections, language, and frequency.
Offers solutions for common issues and guidance for diagnosing faults.
Describes optional accessories like external neutral sensor, rating plug, and battery unit.
