Application 3: Cradle Management and Energy Reduction Maintenance Setting

Presentation

Application 3 is the combination of two functions:

The cradle management function, with the same features as the predefined application 1.
The energy reduction maintenance setting function described here in detail.

Energy Reduction Maintenance Setting Function

The energy reduction maintenance setting (ERMS) function is compatible only with the MasterPacT NT/NWand ComPacT NS or PowerPacT P- and R-frame circuit breakers. It allows the selection of the MicroLogic P and H trip unit settings: Normal and ERMS mode.

This application is used to reduce the instantaneous (Ii) protection settings in order to trip as fast as possible when a fault occurs. The factory setting for Ii protection in ERMS mode is 2xIn. This protection parameter can be modified using the EcoStruxure Power Commission software.

The ERMS mode is in the OFF state if the Ii setting is less than the ERMS setting.

DANGER
HAZARD OF ARC FLASH DO NOT change the MicroLogic P/H trip unit setting while in ERMS mode. Seal the transparent cover of the MicroLogic P and H trip unit when using the ERMS mode. Failure to follow these instructions will result in death or serious injury.

If any of the basic protection settings using the rotary dial is modified on the MicroLogic trip unit while in ERMS mode, the MicroLogic trip unit switches immediately to the normal mode. The MicroLogic trip unit returns automatically to the ERMS mode after 5 seconds.

The selection of the normal or ERMS mode is made by a selector switch connected to two inputs. When the ERMS mode is engaged, ERMS is displayed on the display of the MicroLogic trip unit and a pilot light connected to output O3 is in the ON state.

The locking pad of the communication interface module (IFM or IFE interface) must be in the UNLOCK position (padlock open) while performing the energy reduction maintenance setting (ERMS).

The parameter ACCESS PERMIT in the COM setup or Remote setting menu on the display of the MicroLogic trip unit must be set on YES for IMU without IFM or IFE interface.

This is based on the following behavior:

IMU with IFM or IFE interface
- Setting access permit parameter:
  
  The access permit parameter can be changed only from IFM or IFE interface using the LOCK/UNLOCK dial.
- Behavior:
  
  ERMS ON and OFF orders are executed even if the access permit parameter is set as NO.
IMU without IFM or IFE interface
- Setting access permit parameter:
  
  The access permit parameter can be changed only from the display of the MicroLogic trip unit.
- Behavior:
  
  ERMS ON and OFF orders are not executed if the access permit parameter is set as NO.

NOTE: The ERMS ON and OFF orders are executed only when the access parameter is set to YES and the passcode in the MicroLogic trip unit is set to 0000.

For more information, refer to the following user guides in Related Documents:

MicroLogic P Trip Units - User Guide
MicroLogic H Trip Units - User Guide

Compatible Devices

Range	Minimum Hardware Configuration Required
MasterPacT NT circuit breaker MasterPacT NW circuit breaker ComPacT NS 630b-1600 circuit breaker ComPacT NS 1600b-3200 circuit breaker PowerPacT P- and R-frame circuit breaker	Fixed or drawout circuit breaker + BCM ULP module with firmware version 4.1.0 and above + MicroLogic P trip unit with firmware version Plogic-2013AN or v8282 and above or MicroLogic H trip unit with firmware version Hlogic-2013AN or v8282 and above

Input/Output Assignment

Input	Assignment
I1	Cradle connected position contact (CE)
I2	Cradle disconnected position contact (CD)
I3	Cradle test position contact (CT)
I4	Energy reduction maintenance setting OFF order
I5	Energy reduction maintenance setting ON order
I6	Available NOTE: The outputs can be assigned to the cradle position status with the EcoStruxure Power Commission software. For more information, refer to the user-defined applications.

Output	Assignment
O1, O2	Available NOTE: The outputs can be assigned to the cradle position status with the EcoStruxure Power Commission software. For more information, refer to the user-defined applications.
O3	Energy reduction maintenance setting engaged

NOTE: Switch off the ERMS from the active module (IO module 1 or IO module 2) before changing the ERMS assignments. For example, when ERMS is assigned to IO module 1 and you want to assign ERMS inputs to IO module 2, then switch off the ERMS in IO module 1 and then assign ERMS inputs to IO module 2.

Wiring Diagram

ERMS Mode Engaged

A digital output is assigned to indicate that the ERMS mode is engaged. This output relay is closed in the ERMS mode.

ERMS may be activated after a short delay due to internal controls in the system. Ensure that the output 3 (O3) of IO module is ON, and MicroLogic HMI displays ERMS before operating the equipment.

Cradle Management Events

The events generated by the cradle management function are the same as the events generated by the Application 1.

ERMS Events

The following alarm is generated by the ERMS function. For more information on IO module events, refer to Events and Alarms.

Code	Description	Type	Priority	Reset
3072 (0x0C00)	Discrepancy with ERMS orders	Alarm	Medium	Manual or remote
3073 (0x0C01)	ERMS setting inconsistency	Alarm	High	Auto
3074 (0x0C02)	ERMS engaged for more than 24 hours	Alarm	High	Auto

NOTE: The alarms 3073 and 3074 are generated by BCM ULP module.

Discrepancy with ERMS Orders

The IO module detects the ERMS order discrepancy and generates an alarm when I4 and I5 are 1 or when I4 and I5 are 0.

When the alarm is generated while ERMS mode is engaged, it is necessary to reset the alarm in order to switch off the ERMS mode.

When the alarm is generated while ERMS mode is not engaged, it is necessary to reset the alarm in order to switch on the ERMS mode.

Recommended action: Check wiring from the circuit breaker to the IO module and the inputs of the IO module.

ERMS Setting Inconsistency

This event is generated in ERMS mode when the ERMS setting (Ierms) is set above the Ii protection setting of trip unit.

Recommended action: Check the ERMS setting (Ierms).

ERMS Engaged for More Than 24 Hours

A maintenance operation requiring switching the Ii protection settings in ERMS mode normally lasts for no more than a few hours. Therefore, when the ERMS mode is engaged for more than 24 hours, an event is generated to remind you to switch the Ii protection settings back in normal mode.

Recommended action: Disengage ERMS by selector switch.