Schneider Electric MicroLogic Trip Units: Installation, Settings, and Operation Guide

Important Safety Information

Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. Schneider Electric assumes no responsibility for any consequences arising out of the use of this material. [Note: This information is also provided in French, Spanish, and Chinese in the original document.]

Product Overview

This document provides guidance for the Schneider Electric MicroLogic trip units, specifically designed for the ComPact NSX400-630 circuit breaker series. It covers the following MicroLogic models:

• MicroLogic 1.3
• MicroLogic 2.3
• MicroLogic 5.3
• MicroLogic 6.3
• MicroLogic 5.3E
• MicroLogic 6.3E

These units are essential components for circuit breaker protection and control.

Installation and Mounting

The MicroLogic trip units are designed to be mounted onto the ComPact NSX400-630 circuit breaker chassis. The installation process involves:

• Sliding the trip unit into its designated slot on the circuit breaker.
• Securing the unit, often with screws.
• Connecting internal wiring as per the specific model requirements.

Torque Specifications: Ensure proper electrical contact by adhering to specified torque values for connections. These typically include:

• 0.8 N.m (7 lb-in)
• 2 N.m (17.7 lb-in)
• 7.5 N.m (66 lb-in) for main power connections.

Trip Functionality: A prominent button, often labeled "Push to trip", is integrated into the unit. Pressing this button simulates an overcurrent or fault condition, causing the circuit breaker to trip and disconnect the power. This is a manual test function.

The diagrams illustrate the physical connection of the trip units (e.g., 3-pole or 4-pole configurations, including 3P+N for some models) and the use of tools like screwdrivers (e.g., PZ2, T25) for installation and adjustment.

Zone Selective Interlocking (ZSI)

The MicroLogic units support Zone Selective Interlocking (ZSI), a feature that coordinates the tripping sequence of multiple circuit breakers in a distribution system. This prevents cascading trips by ensuring that the breaker closest to the fault trips first. The diagrams show the connection points for the ZSI signal, typically involving dedicated terminals or wiring.

Setting Protection Parameters

The MicroLogic trip units offer adjustable protection settings to tailor the circuit breaker's response to various electrical fault conditions. Key adjustable parameters include:

• Ir (Long-Time Pickup): The current level at which the long-time delay function starts.
• Isd (Short-Time Delay Pickup): The current level at which the short-time delay function starts.
• tr (Long-Time Delay Time): The time delay for the long-time pickup.
• tsd (Short-Time Delay Time): The time delay for the short-time delay pickup.
• li (Instantaneous Pickup): The current level at which the instantaneous trip function operates.
• Ig (Ground Fault Pickup): The current level for ground fault protection.
• tg (Ground Fault Delay Time): The time delay for the ground fault pickup.

The specific settings and their ranges vary by MicroLogic model (e.g., 1.3, 2.3, 5.3, 6.3). The document provides examples of how to set these parameters using the unit's interface, which typically involves rotary dials or push buttons and a digital display.

Examples of Setting Adjustments:

• For MicroLogic 2.3/5.3, settings like Ir = 2 x In or a specific current value (e.g., Ir = 400 A) are shown. The short-time delay pickup (Isd) can be set as a multiple of Ir (e.g., Isd = Ir x 3) or a specific value (e.g., Isd = 400 x 5 = 2000 A).
• For MicroLogic 6.3, settings for ground fault (Ig) are demonstrated, such as Ig = 630 x 0.60 = 378 A.

Detailed Interface Operation (Page 4):

Page 4 illustrates the detailed process of navigating the trip unit's interface to adjust settings. This involves using buttons such as 'Mode', 'OK', '+', '-', '▼', and '▲' to select parameters and modify their values. The display shows the current setting and allows confirmation. Examples include adjusting 'Ir' to 400 A, 'tr' to 2.0, 'Isd' to 0.5, and other parameters as shown in the step-by-step visual guides.

Further Documentation

For more in-depth information, refer to the following MicroLogic User Guides:

• DOCA0141EN (English)
• DOCA0141FR (French)
• DOCA0141ES (Spanish)
• DOCA0141ZH (Chinese)