Section 3— Circuit Breaker Communication Network Options

PowerPacT™ H-, J, and L-frame circuit breakers with MicroLogic™ trip units can be integrated into a communication network created using Modbus™ protocol. Use data transmitted by the communication network to provide supervision and monitoring for an installation.

This communication network offers the options of:

• Reading remotely:

  • The circuit breaker status

  • Measurements

  • Operating assistance information

• Controlling the circuit breaker remotely

For more information about the Modbus communication network, refer to the specific circuit breaker user manual.

For more information about the communication network, refer to the MasterPacT and PowerPacT UL/ANSI ULP System — Installation and User Guide.

Remote readout of the circuit breaker status is accessible by all circuit breakers equipped with a BSCM. The following data is available using the communication network:

• Open/closed position (OF)

• Trip indicator (SD)

• Electrical fault indicator (SDE)

For more information, refer to the bulletin shipped with the circuit breaker.

Access the measurement readout with MicroLogic 5 and 6 trip units. For more information about measurements, refer to the EPC Online Help.

Access the operating assistance readout with MicroLogic 5 and 6 trip units. The following operating assistance information is available:

• Protection and alarm settings (see Section 5 — EcoStruxure Power Commission (EPC) Software)

• History and tables of time-stamped events (more information is available in the help menu within EPC).

• Maintenance indicators (see Maintenance Indicators)

The circuit breaker remote control is accessible by any circuit breaker with a MicroLogic trip unit, a BSCM, and a communicating motor mechanism. The following commands are available using the communication network:

• Circuit breaker opening

• Circuit breaker closing

• Circuit breaker reset

For more information, refer to the bulletin shipped with the circuit breaker.

BSCM Counters

The counters embedded in the BSCM generate information relating to the number of volt-free contact operations. These volt-free contacts qualify:

• The number of open/close operations (OF contact) and open on fault operations (SD and SDE contacts) on the PowerPacT H-, J-, or L-frame circuit breaker

• The number of close, open, and reset operations on the motor mechanism

Access the maintenance counters embedded in the MicroLogic trip unit with the communication option.

• Counters are assigned to each type of protection:

  • Long time protection

  • Short-time protection

  • Ground-fault protection

  • Jam motor protection

  • Phase unbalance protection

  • Long start motor protection

  • Underload motor protection

• Ten counters are assigned to the alarms associated with measurements. These counters reset if the alarm is reconfigured.

• One counter indicates the number of operating hours. This counter is updated every 24 hours.

• Four counters are assigned to the load profile: Each counts the number of operating hours per loading section (for example, one counter indicates the number of operating hours for the loading section 50–79% of In. Six counters are assigned to the temperature section (for example, one counter indicates the number of operating hours for the temperature section 140–165°F (60–74°C).

• Use maintenance counters to enter quantitative information about operations performed on the MicroLogic trip unit (such as the number of push to trip tests) or the status of the MicroLogic trip units (such as the number of Err screens or protection setting lock/unlock operations).

• One counter indicates the amount of wear on the circuit breaker contacts as a percentage. When this figure reaches 100%, the contacts must be changed.

History

MicroLogic trip units generate three types of history:

• History of alarms associated with measurements (the last ten alarms are recorded)

• History of trips (the last 18 trips are recorded)

• History of maintenance operations (the last ten operations are recorded)

Time-Stamped Information

Time-stamped information displays dates for important information such as previous protection settings and minimum/maximum current, voltage, and network frequency values.

The table of time-stamped information describes:

• The previous protection configurations and corresponding dates

• The minimum and maximum voltage measurement values and corresponding dates

• The maximum current measurement values and corresponding dates

• The minimum and maximum network frequencies and corresponding dates

The time when the minimum and maximum values were reset is also available.