Section 3—Electronic Trip Systems

The ET1.0 trip system is available on M-frame circuit breakers with both fixed and adjustable long-time (lr) setting and adjustable instantaneous (li) tripping. The long-time pickup is adjustable from 300 to 800 A. For fixed long-time circuit breakers, there are two circuit breaker amperage ratings. The instantaneous trip is a multiple of this setting from 2–10 x with no intentional time delay. There is additionally an automatic molded case switch available in 600 and 800 A.

The ET1.0I trip system is available on both P-frame and R-frame circuit breakers and is equipped with fixed long-time and adjustable instantaneous tripping functions only. The long-time pickup is fixed at 1.0 x sensor rating (I_n), while the instantaneous pickup is adjustable (dial settings from 1.5–12 x I_n) with no intentional time delay.

The ET1.0M trip system is only available on P-frame motor circuit protectors and provides protection for short circuit conditions only. The trip unit has a single adjustment for instantaneous pickup that, if exceeded, will trip the circuit breaker with no intentional delay. Instantaneous trip dial settings are 2–16 x I_n for 600 A circuit breakers and 1.5–12 x I_n for 800–1200 A circuit breakers.

1—Long-time current setting and tripping delay 2—Short-time pickup and tripping delay 3—Overload signal (LED) 4—Long-time rating plug screw 5—Instantaneous pickup 6—Test connector

The MicroLogic 2.0, 3.0, and 5.0 basic trip units protect power circuits.

Protection Settings

Protection thresholds and delays are set using the rotary switches. A full-range of long-time settings are available via field-installable adjustable rating plugs.

• Overload protection

  • True RMS long-time protection

  • Thermal imaging: Active thermal imaging before and after tripping

• Short-circuit protection

  • Short-time RMS

  • Selection of I²t type (ON or OFF) for short-time delay

• Instantaneous protection

• Neutral protection on four-pole circuit breakers

A—Indication of tripping cause B—Navigation buttons C—Long-time current setting and tripping delay D—Short-time pickup and tripping delay E—Ground-fault pickup and tripping delay F—Test lamp and reset G—Digital display H—Three-phase bar graph and ammeter I—Overload signal (LED) J—Long-time rating plug screw L—Instantaneous pickup L—Electronic push-to-trip M—Test connector

MicroLogic A trip units protect power circuits and provide current measurements, overload protection, and short-circuit protection. In addition, the 6.0A trip units also provide ground-fault protection for equipment.

Protection Settings

Protection thresholds and delays are set using the rotary switches. The selected values are momentarily displayed in amperes and in seconds. A full-range of long-time settings are available via the field-installable rating plug:

• Overload protection (true RMS long-time protection)

• Thermal imaging (active thermal imaging before and after tripping)

• Short-circuit protection:

  • Short-time RMS

  • I²t ON or OFF for short-time delay

• Instantaneous protection

• Ground-fault protection for equipment:

  • Residual ground-fault protection for equipment

  • Source ground-return ground-fault protection for equipment

  • Modified differential ground-fault protection (MDGF) for equipment

• Neutral protection on four-pole circuit breakers

• ZSI: Zone-selective interlocking:

  • ZSI terminal block may be used to interconnect a number of trip units to provide total discrimination for short-time and equipment ground-fault protection, without delay for tripping).

  • Not available for 3.0A trip units or for 2.0A trip units installed as upstream devices.

Ammeter Measurements

MicroLogic A trip units measure the true RMS value of currents. They provide continuous current measurement from 0.2 to 20 x I_n with an accuracy of 1.5% (including sensors). No auxiliary source is needed where I > 0.2 x I_n. The optional external power supply (24 Vdc) makes it possible to display currents where I < 0.2 x I_n and to store values of the interrupted current.

A digital LCD screen continuously displays the most heavily loaded phase (I_max) or displays the I_A, I_B, I_C, I_g, and (on 4P circuit breakers only) I_N stored current and setting values by successively pressing the navigation button.

Communication Network

In conjunction with an optional communication network, the trip unit transmits the following parameters:

• Setting values

• All ammeter measurements

• Tripping causes

Current-based protection functions require no auxiliary power source.

A—Indication of tripping cause B—High resolution screen C—Measurement display D—Navigation buttons E—Long-time current setting and tripping delay F—Short-time pickup and tripping delay G—Hole for settings lockout pin H—Ground-fault pickup and tripping delay I—Test lamp and indication reset J—Maintenance indicators K—Protection settings L—Overload signal (LED) M—Long-time rating plug screw N—Instantaneous pickup O—Electronic push-to-trip P—Test connector

MicroLogic P trip units provide power metering and extended protection in addition to the adjustable protection functions of the MicroLogic A trip unit.

Protection Settings

The adjustable protection functions of the 5.0P and 6.0P trip units are identical to those of the MicroLogic A trip unit (overloads, short circuits, equipment ground-fault protection; see MicroLogic 2.0A, 3.0A, 5.0A and 6.0A Trip Units with Ammeter). These units also feature:

• Fine adjustment
  Within the range below the rotary switch setting, fine adjustments of pickups/delays in steps of 1 A/s (except for short-time and ground-fault) are possible on the keypad or remotely by the communication network.

• Inverse definite minimum time lag (IDMTL) setting.
  Coordination with fuse-type or medium-voltage protection systems is optimized by adjusting the long-time delay curve around 6 x I_r axis. This setting ensures better coordination with certain loads.

• Neutral protection
  On three-pole circuit breakers, neutral protection may be set using the keypad or remotely using the communication network to one of four positions: OFF, 1/2N (1/2 x I_n), 1N (1 x I_n), or 1.6N (2 x I_n).
  NOTE: Neutral protection is disabled if long-time curve is set to one of the IDMTL protection settings.

• Configuring Alarms and Other Protection Functions
  When the cover is closed, the keypad may no longer be used to change the protection settings, but it still provides access to the displays for measurements, histories, indicators, etc. Depending on the thresholds and time delays set, the MicroLogic P trip unit monitors current, voltage, power, frequency, and phase sequence. Each threshold overrun may be signalled remotely via the communication network.

Each threshold overrun may be combined with tripping (protection) or an indication carried out by an alarm programmed accessible with the optional IO module, or both (protection and alarm).

Maintenance Record

The maintenance record can be consulted using the service interface kit or the full-function test kit, or remotely via the communication network. It can be used as an aid in troubleshooting and to assist scheduling for device maintenance operations. Recorded indications include:

• Highest current measured

• Operation counter (cumulative total and total since last reset)

• Number of test kit connections

• Number of trips in operating mode

Load Shedding and Reconnection Parameters

Load shedding and reconnection parameters can be set according to the power or the current flowing through the circuit breaker. Load shedding is carried out by a remote computer via the communication network.

Indication Option Via Programmable Contacts

Alarms may be used to signal threshold overruns or status changes. It can be programmed using the keypad on the MicroLogic P trip unit or remotely using the communication network. The contact is required to obtain data from the protective relay functions on Type P and Type H trip units.

The last ten trips and ten alarms are recorded in two separate history files that can be displayed on the screen (sample displays are shown).

The following information is contained in these files:

Trip History	Alarm History
• Type of fault	• Type of alarm
• Date and time of fault	• Date and time of alarm
• Interrupted current	• Values measured at time of alarm

The MicroLogic P trip unit calculates in real time the electrical values V, A, W, VAR, VA, Wh, VARh, VAh, Hz, power factor and crest factor. It also calculates demand current and power over an adjustable time period.

Current Metering	Maximum Current	Voltage Metering	Power Metering	Frequency	Power Demand

Real-Time Metering

The value displayed on the screen is refreshed every second. Minimum and maximum measurement values are stored in memory.

Demand Metering

The demand is calculated over a fixed or sliding time window that can be programmed from five to sixty minutes. Depending on the contract signed with the power supplier, specific programming makes it possible to avoid or minimize the cost of overrunning the subscribed power. Maximum demand values are systematically stored and time stamped.

The communication network may be used to:

• Remotely read parameters for the protection functions.

• Transmit all the measurements and calculated values.

• Signal the causes of tripping and alarms.

• Consult the history files and the maintenance indicator record.

In addition, an event log of the last 100 events and a maintenance record, which is stored in the trip unit memory but not available locally, may be accessed via the communication network.

This Modbus communication system is compatible with the PowerLogic™ System Manager software (SMS).

The event log may be accessed by a remote computer via the communication network. All events are time stamped and include:

• Trips

• Beginning and end of alarms

• Modifications to settings and parameters

• Loss of time

• Test kit connections

• Counter resets

• System faults (thermal self-protection, major fault and minor fault alarms)

In addition to the P functions, the MicroLogic H trip units offer:

• In-depth analysis of power quality including calculation of harmonics and the fundamentals.

• Diagnostics aid and event analysis through waveform capture.

• Customized alarm programming to analyze and track down a disturbance on the ac power system.

• Systematic time stamping of all events and creation of logs.

Metering

The MicroLogic H trip unit offers all the measurements carried out by the MicroLogic P trip unit, with the addition of phase-by-phase measurements of power and energy as well as calculation of:

• Current and voltage total harmonic distortion (THD)

• Current, voltage and power fundamentals (50/60 Hz)

• Harmonic components (amplitude and phase) up to the 31st current and voltage harmonic

• Real-time metering: The value displayed on the screen is refreshed every second. The table below shows what is measured in real-time metering.

Demand Metering: Similar to the MicroLogic P trip unit, demand values are calculated over a fixed or sliding time window that can be set from five to sixty minutes.

Waveform Capture

The MicroLogic H trip units can capture and store current and voltage waveforms using digital sampling techniques similar to those used in oscilloscopes. Using the information available in the captured waveform, it is possible to determine the level of harmonics as well as the direction and amplitude of the flow of harmonic power.

The MicroLogic H trip unit can record manually via the keypad the following waveforms:

• Currents I_A, I_B, I_C and I_N

• Phase-to-phase voltages V_AB, V_BC, and V_CA

Waveforms may be displayed on the graphic screen of the control unit or communicated over a networked system. The recording takes place over one cycle with a measurement range of 1 to 1.5 I_n for current and 0 to 690 volts for voltage. Resolution is 64 points per cycle.

Customized Alarm Programming

The instantaneous value of each measurement can be compared to user-set high and low thresholds. Overrun of a threshold generates an alarm. Programmable action can be linked to each alarm, including circuit breaker opening, recording of measurements in a log, etc.

Event Logs

Each event is recorded with:

• The date, time, and name of the event

• The event characteristics

MicroLogic H trip units are designed to be used with an external 24 Vdc power supply. Current-based protection functions require no auxiliary power source.

Long-Time Trip Functions

Long-Time Trip Functions

The long-time pickup switch sets the maximum current level the circuit breaker will carry continuously. The maximum current level (I_r) is the long-time pickup setting multiplied by the sensor plug amperage (I_n). If the current exceeds this value for longer than the long-time delay time, the circuit breaker will trip.

The long-time delay switch sets the length of time that the circuit breaker will carry a sustained overload before tripping. Delay bands are labeled in seconds of overcurrent at six times the ampere rating. For maximum coordination, there are eight delay bands. Long-time delay is an “inverse time” characteristic in that the delay time decreases as the current increases.

The trip unit includes an alarm indicator that will be lit continuously when the current is above 100% of the pickup setting.

Short-Time Trip Functions

Short-Time Trip Functions

The short-time pickup switch sets the short-circuit current level at which the circuit breaker will trip after the set short-time delay. The short-time current (I_sd) equals the short-time pickup setting multiplied by the long-time pickup (I_r).

The short-time delay switch sets the length of time the circuit breaker will carry a short circuit within the short-time pickup range. The delay (based on 10 times the ampere rating I_r) can be adjusted to four positions of I²t ramp operation (I²t ON) or five positions of fixed time delays (I²t OFF). I²t ON delay is an “inverse time” characteristic in that the delay time decreases as the current increases. Short-time delay for the 2.0 trip unit is fixed at a delay band of 20 to 80 ms.

Instantaneous Trip Function

The instantaneous pickup switch sets the short-circuit current level at which the circuit breaker will trip with no intentional time delay. The instantaneous current (I_i) is equal to the instantaneous pickup setting multiplied by the sensor plug amperage (I_n).

The instantaneous function will override the short-time function if the instantaneous pickup is adjusted at the same or lower setting than the short-time pickup. In trip units with both adjustable short-time and instantaneous trip functions, the adjustable instantaneous trip can be disabled by setting Instantaneous pickup to OFF.

Ground-Fault Trip Functions

Ground-Fault Trip Functions

The ground-fault pickup switch sets the current level at which the circuit breaker will trip after the set ground-fault delay. Ground-fault pickup values (I_g) are based on circuit breaker sensor plug (I_n) only, not on the rating plug multiplier (I_r). Changing the rating plug multiplier has no effect on ground-fault pickup values.

The ground-fault delay switch sets the length of time the circuit breaker will carry ground-fault current which exceeds the ground-fault pickup level before tripping. The delay, based on the sensor plug amperage (I_n), can be adjusted to four positions of I²t ramp operation (I²t ON) or five positions of fixed time delays (I²t OFF). I²t ON delay is an “inverse time” characteristic in that the delay time decreases as the current increases.

The wiring system is designed for low-voltage power switchboards. Installation does not require special tools or training. The prefabricated wiring simplifies both data transmission (Modbus protocol) and 24 Vdc power distribution for the communications modules on the MicroLogic trip units.

A. FDM128 display for 8 LV devices B. IFE Ethernet interface for LV circuit breaker and gateway C. IFM Modbus-SL interface for LV circuit breaker D. FDM121 display for LV circuit breaker E. IO input/output interface module for LV circuit breaker F. MasterPacT NT/NW circuit breaker	G. PowerPacT H-, J-, or L-frame circuit breaker H. ULP line terminator I. ULP cable J. Breaker ULP cord K. NSX cord L. PowerPacT P/R or ComPacT NS

A: MicroLogic trip unit with ammeter P: MicroLogic trip unit “Power” H: MicroLogic trip unit “Harmonics” See the section on the MicroLogic trip units for details about the trip units.

The PowerPacT and ComPacT devices can be integrated into Ethernet and Modbus communication environment.

There are four possible functional levels that can be combined.

The Modbus RS 485 (RTU protocol) system is an open bus on which communicating Modbus devices (MasterPacT NW with Modbus COM, Power Meter PM700, PM800, PowerPacT P/R-frame, etc.) are installed. All types of PLCs and microcomputers may be connected to the bus.

Addresses

The Modbus communication parameters (address, baud rate, parity) are entered using the keypad on the MicroLogic A, P, or H trip unit. For a switch, it is necessary to use the Electrical Asset Manager or RSU (Remote Setting Utility) MicroLogic utility.

Number of Devices

The maximum number of devices that may be connected to the Modbus bus depends on the type of device (PowerPacT circuit breaker with Modbus COM, PM700, PM800, MasterPacT circuit breaker, etc.), the baud rate (19200 is recommended), the volume of data exchanged and the desired response time. The RS 485 physical layer offers up to thirty-two connection points on the bus (one client, thirty-one servers).

Length of Bus

The maximum recommended length for the Modbus bus is 3940 feet (1200 meters).

Ethernet is a data link and physical layer protocol defined by IEEE 802 10 and 100 Mbps specifications that connects computer or other Ethernet devices. Ethernet is an asynchronous Carrier Sense Multiple Access with Collision detection (referred as CSMA/CD) protocol. Carrier Sense means that the hosts can detect whether the medium (coaxial cable) is idle or busy.

Multiple Access means that multiple hosts can be connected to the common medium. Collision Detection means a host detects whether its transmission has collided with the transmission of another host (or hosts).

IFE Ethernet interface can be connected to a PC or a laptop over Ethernet. The maximum length of Ethernet cable is 325 feet (100 meters). IFE Ethernet interface + gateway provides a Modbus TCP/IP gateway over Ethernet to enable Modbus TCP communication from a Modbus TCP client to any Modbus server devices connected to it. The maximum active Modbus TCP client connection is twelve.

IFE Ethernet interface has an embedded web server (web page).

IFE Interface

IFE Interface + Gateway

Introduction

The IFE interface and IFE interface + gateway enable low-voltage circuit breakers such as MasterPacT NT/NW or PowerPacT P/R-frame to be connected to an Ethernet network.

IFE Interface

Provides Ethernet access to a single low-voltage circuit breaker.

Function: Interface - one circuit breaker is connected to the IFE interface using its ULP port.

IFE Interface + Gateway

Provides Ethernet access to one or several low-voltage circuit breakers.

Functions:

• Interface - one circuit breaker is connected to the IFE interface using its ULP port.

• Gateway: several circuit breakers on a Modbus network are connected using the IFE interface + gateway client Modbus port.

IFE Interface, IFE Interface + Gateway Features

• Dual 10/100 Mbps Ethernet port for simple daisy chain connection.

• Device profile web service for discovery of the IFE interface, IFE interface + gateway on the LAN.

• Ethernet interface for MasterPacT and PowerPacT circuit breakers.

• Gateway for Modbus-SL connected devices (IFE interface + gateway only).

• Embedded set-up web pages.

• Embedded monitoring web pages.

• Embedded control web pages.

• Built-in e-mail alarm notification.

The IFE interface and IFE interface + gateway are DIN rail mounting devices. A stacking accessory enables the user to connect several IFMs (ULP to Modbus interfaces) to an IFE interface + gateway without additional wiring.

The IFE interface and the IFE interface + gateway must always be supplied with 24 Vdc power.

The IFMs stacked to an IFE interface + gateway have power supplied by the IFE interface + gateway, thus it is not necessary to supply them separately. It is recommended to use a UL listed and recognized limited voltage/limited current or a class 2 power supply with a 24 Vdc, 3 A maximum.

The connection to an IFE interface or IFE interface + gateway requires a communication module embedded into the circuit breaker:

• PowerPacT and ComPacT circuit breakers: BCM ULP communication module

• Drawout PowerPacT and ComPacT circuit breakers: BCM ULP and its respective I/O (Input/Output) application module.

All connection configurations for the circuit breakers require the circuit breaker ULP cord. The insulated NSX cord is mandatory for system voltages greater than 480 Vac. When the second ULP RJ45 connector is not used, it must be closed with a ULP terminator (TRV00880).

A. Ethernet 1 and Ethernet 2 communication port B. 24 Vdc power supply terminal block C. Ethernet communication LEDs: yellow: 10 Mb green: 100 Mb D. Module status LED: steady off: no power steady green: device operational steady red: major fault flashing green: standby flashing red: minor fault flashing green/red: self-test E. Network status LED: steady off: no power/no valid IP address  steady green: connected, valid IP address steady orange: default IP address steady red: duplicated IP address flashing green/red: self-test F. Sealable transparent cover G. ULP status LED H. Test button (accessible closed cover) I. Locking pad J. Modbus traffic status LED (IFE Interface + Gateway only) K. Device name label L. ULP ports

IFM Modbus Communication Interface TRV00210

An IFM Modbus communication interface is required for connection of a MasterPacT or PowerPacT circuit breaker to a Modbus network as long as this circuit breaker is provided with a ULP (Universal Logic Plug) port. The port is available on the BCM ULP.

Once connected, the circuit breaker is considered as a server by the Modbus client. Its electrical values, alarm status, open/close signals can be monitored or controlled by a Programmable Logic Controller or any other system.

ULP Port

Two RJ45 sockets, internal parallel wiring.

• Connection of a single circuit breaker.

• A ULP line terminator or an FDM121 display unit must be connected to the second RJ45 ULP socket.

• The RJ45 sockets deliver a 24 Vdc supply fed from the Modbus socket.

• Built-in test function, for checking the correct connection to the circuit breaker and FDM121 display unit.

Modbus Server Port

• Top socket for screw-clamp connector, providing terminals for:

  • 24 Vdc input supply (0 V, +24 V)

  • Modbus line (D1, D2, Gnd) 2-wire Modbus system.

• Lateral socket, for DIN-rail stackable connector. Both top and lateral sockets are internally parallel wired.

• Multiple IFMs can be stacked, thus sharing a common power supply and Modbus line without individual wiring.

• On the front face:

  • Modbus address setting (1 to 99): two coded rotary switches

  • Modbus locking pad: enables or disable the circuit breaker remote control and modification of IFM parameters.

• Self-adjusting communication format (Baud rate, parity).

A. Modbus Screw Clamp Connector B. Modbus Address Switches C. Modbus Traffic LED D. Modbus Locking Pad E .ULP Activity LED F .Test Button G. Mechanical Lock H. ULP RJ45 Connectors I. Stacking Accessory Connection

Stacking an IFM

Stacking Accessories
	Up to 12 Stacked IFMs

Stacking an IFE Interface + Gateway with IFMs

I/O Application Module

The I/O (Input/Output) application module for an low-voltage circuit breaker is part of an ULP system with built-in functions and applications to enhance the application needs. The ULP system architecture can be built without any restrictions using the wide range of circuit breakers.

The I/O application module is compliant with the ULP system specifications.

Two I/O application modules can be connected in the same ULP network.

The ranges of low-voltage circuit breakers enhanced by the I/O application module are:

• MasterPacT NW

• MasterPacT NT

• PowerPacT R-Frame

• PowerPacT P-Frame

• ComPacT NS

The I/O application module resources are:

• Six digital inputs that are self powered for either NO and NC dry contact or pulse counter

• Three digital outputs that are a bistable relay (5 A maximum)

• One analog input for PT100 temperature sensor

The pre-defined application adds new functions to the I/O application module by:

• Selection by the application rotary switch on the I/O application module, defining the application with pre-defined input/output assignment and wiring diagram.

• No additional setting with the customer engineering tool required.

The resources not assigned to the pre-defined application are free for additional user-defined applications:

• cradle management

• circuit breaker operation

• cradle management + ERMS (Energy Reduction Maintenance Setting)
  

  NOTE: Use only MicroLogic P or H trip units with the blue ERMS label for energy reduction maintenance setting systems. Review the I/O module user guide 0613IB1317 and ERMS installation instructions NHA67346 for details on installation, testing, and operation of the ERMS system.

• light and load control

• custom

User-defined applications are processed by the I/O application module in addition to the pre-defined application selected.

The user-defined applications are available depending on:

• the pre-defined application selected

• the I/O application module resources (inputs and outputs) not used by the application.

The resources required by user-defined applications are assigned using the customer engineering tool:

• protection

• control

• energy management

• monitoring

The I/O application module is a DIN rail mounted device. Install on a steel DIN rail that is properly grounded near the device.

The application rotary switch enables the selection of the pre-defined application. It has nine positions and each position is assigned to a pre-defined application. The factory set position of the switch is pre-defined application one.

The setting locking pad on the front panel of the I/O application module enables the setting of the I/O application module by the customer engineering tool.

The EcoStruxure engineering tool is a software application that helps the user to manage a project as part of designing, testing, site commissioning, and maintenance of the project life cycle. It enables the user to prepare the settings of the devices offline (without connecting to the device) and configure them when connected with the devices. It also provides other value-added features for the user to manage the project such as: safe repository in cloud, attach artifacts to each device or at the project level, organize devices in switchboard, manage a hierarchical structure of the installation, etc.

The EcoStruxure engineering tool is compatible with the following devices:

• ComPacT NSX100-630 (IEC) circuit breakers

• PowerPacT (UL) circuit breakers

• ComPacT NS630b-3200 (IEC) circuit breakers

• MasterPacT NT/NW (IEC and UL) circuit breakers

• Compatible devices (Device Management in the project)

• Switches (ComPacT NSX, MasterPacT and PowerPacT Family)

• Third party devices

References:

The EcoStruxure software package can be downloaded from our website:

www.se.com

The EcoStruxure engineering tool includes the Schneider Electric customer engineering tools such as the Remote Setting Utility (RSU) and Remote Control Utility (RCU) with additional features.

The EcoStruxure engineering tool supports the connection of Schneider Electric communicable devices to:

• create projects by device discovery, selection of devices, and importing a Bill of Material (BOM)

• monitor the status of protection and I/O status

• read information (alarms, measurements, parameters)

• check protection discrimination between two devices

• upload and download of configuration or settings in batch mode to multiple devices.

• carry out commands and tests

• generate and print a device settings report and communication test report

• manage multiple devices with an electrical and communication hierarchy model

• manage artifacts (project documents)

• check consistency in settings between devices on a communication network

• compare configuration settings between PC and device (online)

• download latest firmware

The EcoStruxure engineering tool enables the user to access the advanced features of the software once the project is saved in the Schneider Electric cloud.