Application 1: Cradle Management

Presentation

The cradle management application is used to:

• Record and check the position of drawout circuit breakers in the cradle.

• Provide information about the preventive maintenance actions.

• Notify the remote controller about the position of the drawout circuit breaker.

  NOTE: When the circuit breaker is detected as being in the disconnected position, the remote controller quits polling the MicroLogic trip unit. If the remote controller does not quit polling, the remote controller receives the time-out response as long as the circuit breaker is disconnected.

The cradle information is available on:

• FDM121 display

• FDM128 display using the Ethernet communication network

• Remote controller using the communication network

• IFE webpages

Monitoring from a remote controller using the communication network requires a communication interface module (IFM or IFE interface).

Compatible Devices

Input/Output Assignment

Wiring Diagram for MasterPacT NT/NW and ComPacT NS 630b-1600 or PowerPacT P-Frame Circuit Breakers

Wiring Diagram for ComPacT NSX or PowerPacT H-, J-, and L-Frame Circuit Breakers

Cradle Position Status

The cradle position status is defined from the status of the digital inputs I1, I2, and I3:

• Cradle in connected position (I1=0, I2=1, I3=1)

• Cradle in disconnected position (I1=1, I2=0, I3=1)

• Cradle in test position (I1=1, I2=1, I3=0)

Cradle Position Counters

The cradle position counters are:

• Cradle connected position counter

• Cradle disconnected position counter

• Cradle test position counter

A counter is linked to each cradle position state. The counter is incremented each time the linked state is activated.

The cradle position counters have the following properties:

• The counters are saved in non-volatile memory to prevent data loss in case of power loss.

• The counters are incremented from 0 to 65534.

Application Events

The following events are generated by the application. For more information on IO module events, refer to Events and Alarms.

Cradle Position Discrepancy Alarm

The IO module detects the cradle position discrepancy and generates an alarm when the cradle position contacts indicate that the circuit breaker is not in one of the allowable positions, connected, disconnected, or test.

Recommended action: Check the status of the cradle position contacts, wiring to the IO module, and the inputs of IO module.

Cradle Position Events

A time-stamped event is generated for each change on a cradle position state to record the date and time of each cradle operation. The cradle position events are:

• Last connection of the cradle

• Last disconnection of the cradle

• Last cradle in test position

Disconnection of the Circuit Breaker from Cradle is Overdue

The alarm is generated after 11 months without disconnecting the circuit breaker, to remind you to operate the cradle at least once in every year by moving the circuit breaker from connected position to disconnected position and from disconnected position to connected position.

Recommended action: Disconnect the circuit breaker from the cradle and connect it back.

Cradle has Reached Its Maximum number of operations

The cradle is designed to be connected 500 times and must be replaced before that number is reached. The alarm is generated when the cradle connected position counter reaches 450.

Recommended action: Replace the cradle. Contact Schneider Electric service personnel for any assistance.

Remaining Service Life of Cradle is Below Alarm Threshold

Regrease the cradle and clusters. The cradle needs a comprehensive check-up when:

• The cradle is in operation for five years.

• The cradle position counter reaches 250.

Recommended action: Plan to replace the cradle. To refine this theoretical alarm by taking into account environmental parameters, you may ask for aging diagnostic. If the device is cloud connected, use EcoStruxure Asset Advisor for remote aging diagnostic. Otherwise, contact Schneider Electric services for a local aging diagnostic.

New MicroLogic Detection Alarm

A time-stamped alarm is generated when the IO module detects that the MicroLogic trip unit of the circuit breaker has been replaced. The detection is based on the MicroLogic trip unit serial number.