Accessories for MicroLogic Trip Units

MicroLogic trip units are connected to the Modbus communication interface module (IFM) or front display module through the internal terminal block for the NSX cord equipped with an RJ45 connector.

The NSX cord is available in two cable lengths:

• 4.27 ft. (1.3 m)

• 9.84 ft. (3 m)

Lengths up to 32.8 ft. (10 m) are possible using extensions.

• For voltage V ≤ 480 V, available in 3 prefabricated lengths: 0.35 m, 1.3 m and
  3 m.

• For voltages V > 480 V, a special 1.3 m cable with an insulation accessory is required.

• A set of cables with RJ45 connectors is available to adapt to different distances between devices.

Functions

The optional BSCM Breaker Status & Control Module is used to acquire device status indications and control the communicating remote-control function. It includes a memory used to manage the maintenance indicators.

Status indications

Indication of device status:

Auxiliary switch (OF), alarm switch (SD), and overcurrent trip switch (SDE).

Maintenance indicators

The BSCM manages the following indicators:

• mechanical operation counter

• electrical operation counter

• history of status indications.

It is possible to assign an alarm to the operation counters.

Controls

The BSCM can be used to carry out communicating remote control operations using the communicating motor operator (open, close and reset) in different modes (manual, auto).

Mounting

The BSCM can be installed on all PowerPacT H-, J-, and L-frame circuit breakers and automatic switches with MicroLogic trip units. It simply clips into the auxiliary contact slots. It occupies the slots of one auxiliary switch (OF) and one overcurrent trip switch (SDE). The BSCM is supplied with 24 Vdc power automatically through the NSX or Modbus Serial Cord when the communication network is installed.

The Modbus Serial Hub is an optional wiring aid for daisy chaining up to four Modbus Serial devices using RJ45 connectors, wired terminal block connection and/or a compatible stacking connector (TRV00217).  The Modbus Serial Hub can support direct wiring of up to three breakers using the BSCM (S434220) with MB SL CordsModbus serial only <= 480Vac. Use only with matching Modbus serial components. *. The Modbus Serial Hub is DIN Rail mountable and stackable with IFMs (LV434000) and IFEs (LV434001 / LV434002) to use in mixed communication architectures. Multiple Modbus Serial Hubs can be used together to further expand communications with additional stacking connectors or wired through the terminal block.

The MicroLogic 5/6 trip unit display is operational when current is flowing through the circuit breaker. To power the MicroLogic 5/6 trip unit when the trip unit is not connected to an FDM121 or to the communication network, a 24 Vdc power-supply terminal block can be installed only on MicroLogic 5/6 trip units. When used, it excludes connection of an NSX cord.

An external 24 Vdc power supply is required for installation in a communication network, whatever the type of trip unit.

On installations without a communication network, the power supply is available as an option for MicroLogic 5/6 trip units in order to:

• modify settings when the circuit breaker is open

• display measurements when the current flowing through the circuit breaker is low (15 to 50 A depending on the rating)

• maintain the display of the cause of tripping and interrupted current.

A single external 24 Vdc supply may be used for the entire network, depending on the number of devices in the communication network. The required characteristics are:

• output voltage: 24 Vdc ± 5%

• ripple: ± 1%

To determine the required output current of the 24 Vdc power supply, it is necessary to sum up the currents consumed by the different loads supplied.

For installation recommendations, see 24 Vdc Power Supply Terminal Block.

The battery module is a back-up supply for the external power-supply module. The input/output voltages are 24 Vdc and it can supply power for approximately three hours (100 mA).

The pocket tester connects to the MicroLogic trip unit test connector. It powers up the MicroLogic trip unit and the Ready LED. It supplies the screen, allows settings to be made using the keypad, and provides thermal imaging inhibit functions.

The pocket tester runs off of two Alkaline AA batteries.

Since Modbus interface modules (part number STRV00210) are not isolated, an isolated Modbus Repeater Module needs to be inserted between the Modbus network inside the equipment and the Modbus network outside the equipment.

The SI (LV485500) is a portable instrument designed for field testing and configuration of MicroLogic™ trip units mounted in PowerPacT™ H-, J-, and L-frame circuit breakers. The user interface, EcoStruxure™ Power Commission (EPC), is a global software with test functions and features for testing the circuit breakers and communication accessories through the Service Interface.

Specific test functions and compatibility, by the circuit breaker, can be found in the SI user guide (DOCA0170EN-04).

The Universal Logic Plug (ULP) system allows the PowerPacT H-, J- and L-frame circuit breakers to become metering and supervision tools to assist for energy efficiency. For easy connection of the different modules, the prefabricated cables are identified by a ULP symbol. The connection points on compatible modules are marked in the same manner.

For more information about the ULP System, see bulletin 48940-329-01, ULP (Universal Logic Plug) Connection System—User Guide.

The external neutral current transformer is a sensor required for a three-pole circuit breaker in a system with a distributed neutral to measure the neutral current in order to:

• protect the neutral conductor

• protect against ground faults.

This current transformer can be connected to MicroLogic 5/6 trip units. The transformer rating must be compatible with that of the circuit breaker.

For installation recommendations, see External Neutral Current Transformer (ENCT).

The external neutral voltage tap is required for MicroLogic E power metering with a three-pole circuit breaker in a system with a distributed neutral. It is used to connect the neutral to the MicroLogic trip unit to measure phase-to-neutral (Ph-N) voltages.

The ENVT is included with the MicroLogic 5/6 electronic trip unit.

A ZSI terminal block may be used to interconnect a number of MicroLogic trip units to provide zone selective interlocking for short-time (I_sd) and ground-fault (I_g) protection, without a time delay. For PowerPacT H- and J-frame circuit breakers, the ZSI function is available only in relation to the upstream circuit breaker (ZSI out). For PowerPacT L-frame circuit breakers, the ZSI function is available in relation to the upstream circuit breaker (ZSI out) and downstream circuit breakers (ZSI in)

Accessories installed in I-Line circuit breakers require the use of optional wiring harnesses (not provided). The wiring harness allows the accessory wiring to exit the circuit breaker through wiring channels in the side of the circuit breakers. Wire harnesses may also be used for unit-mount applications.