Indication on the MicroLogic Display - ComPact NSX Legacy MicroLogic 5/6/7

Presentation

Indication screens indicate the status of the installation.

Maintenance interventions should be executed according to the priority level:

Configured (alarms: high, medium, low, or no priority)
Pre-defined (trip and failure events: high or medium priority)

Stacking Screens

When a number of events arrive simultaneously, they stack according to their criticality level: 0 (no criticality) to 4 (high criticality).

Criticality	Screen ⁽¹⁾
0	Main screen
1	Outx alarm screen
2	Err internal failure screen
3	Stop internal fault screen
4	Trip screen
(1) The screens and their acknowledgment procedure are described below.

Example:

An alarm on a voltage measurement Outx, then an internal failure Err occurred:

The screen displayed is the internal failure Err screen (Criticality = 2).
After acknowledging the internal failure Err screen, the alarm Outx screen is displayed (Criticality = 1).
After acknowledging the internal failure Outx screen, the main screen is displayed (Criticality = 0).

The same acknowledgment sequence should be performed if the internal failure Err occurred before the voltage measurement Outx.

Safety Instructions

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH If the trip unit displays a St0p screen, replace the MicroLogic trip unit immediately. If trip unit displays a fault screen, do not close the circuit breaker again without first inspecting and, if necessary, repairing the downstream electrical equipment. Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462 or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm that power is off. Replace all devices, doors, and covers before turning on power to this equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

If the trip unit displays a St0p screen, replace the MicroLogic trip unit immediately.
If trip unit displays a fault screen, do not close the circuit breaker again without first inspecting and, if necessary, repairing the downstream electrical equipment.
Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462 or local equivalent.
This equipment must only be installed and serviced by qualified electrical personnel.
Turn off all power supplying this equipment before working on or inside equipment.
Always use a properly rated voltage sensing device to confirm that power is off.
Replace all devices, doors, and covers before turning on power to this equipment.

Failure to follow these instructions will result in death or serious injury.

CAUTION
HAZARD OF INCORRECT INFORMATION If the trip unit displays an Err screen, replace the MicroLogic trip unit at the next regular maintenance. Failure to follow these instructions can result in injury or equipment damage.

Indication of Correct Installation Operation

Screen	Cause
I phase 2	The main screen displays the current value of the most heavily loaded phase.

Alarm Indication

Circuit breaker with SDx module option

Screen	Cause
Outx	An alarm configured on the SDx module in permanent latching mode has not been acknowledged or the acknowledgment request is made when the alarm is still active.

Check the cause of the alarm and acknowledge the alarm by pressing the key twice (validation and confirmation).

The main screen (current value of the most heavily loaded phase) is displayed.

Indication of Faults With MicroLogic 5, 6, and 7 Trip Units

For more information about definitions of the protections associated with indications, refer to the electrical distribution protection.

Screen	Cause
Breaking current Ir	Tripped by long-time protection: Up arrow pointing to Ir, breaking value displayed
Peak breaking current Isd	Tripped by short-time protection: Up arrow pointing to Isd, breaking value displayed
Peak breaking current Ii	Tripped by instantaneous protection or reflex protection: Up arrow pointing to Ii, breaking value displayed
	Tripped by integrated instantaneous protection: Up arrow pointing to Ii, triP displayed
	MicroLogic 6 trip unit Tripped by ground-fault protection: Up arrow pointing to Ig, triP displayed
	MicroLogic 7 with integrated earth-leakage protection Tripped by earth-leakage protection: Up arrow pointing to IΔn
	Tripped due to lack of ENCT option, as the ENCT option was declared during the protection function settings of the MicroLogic trip unit. Install the ENCT option or connect a jumper between terminals T1 and T2 on the MicroLogic trip unit.

Indication of Faults With MicroLogic 6 E-M Trip Unit

For more information about definitions of the protections associated with indications, refer to the protection for motor-feeders.

Screen	Cause
	Tripped by long-time protection: Up arrow pointing to Ir, triP displayed ⁽¹⁾
Peak breaking current Isd	Tripped by short-time protection: Up arrow pointing to Isd, breaking value displayed
	Tripped by instantaneous protection or reflex protection: Inst displayed
	Tripped by ground-fault protection: Up arrow pointing to Ig, triP displayed
	Tripped by unbalance protection: Up arrow pointing to Iunbal, triP displayed ⁽¹⁾
	Tripped by jam motor protection: Up arrow pointing to Ijam, triP displayed ⁽¹⁾
	Tripped by underload protection: Undl displayed ⁽¹⁾
	Tripped by long-start protection: Strt displayed
(1) These trip causes can be managed automatically by SDTAM output 2 (OUT2) action on the contactor.

Acknowledging the Trip Screens

Acknowledge the trip screens by pressing the key twice (validation and confirmation).

WARNING
HAZARD OF CLOSING ON ELECTRICAL FAULT Do not close the circuit breaker again without first inspecting and, if necessary, repairing the downstream electrical equipment. Failure to follow these instructions can result in death, serious injury, or equipment damage.

The fact that a protection has tripped does not remedy the cause of the fault on the downstream electrical equipment.

Step	Action
1	Isolate the feed before inspecting the downstream electrical equipment.
2	Look for the cause of the fault.
3	Inspect and, if necessary, repair the downstream equipment.
4	Inspect the equipment in the event of a short-circuit trip.
5	Reset and close the circuit breaker again.

For more information about troubleshooting and restarting following a fault, refer to DOCA0140EN ComPact NSX - Circuit Breakers and Switch-Disconnectors 100–630 A - User Guide.

Indication of a Minor Internal Malfunction of the MicroLogic Trip Unit

Screen	Cause
	A minor internal malfunction on the MicroLogic trip unit, whether temporary or permanent, has occurred without the circuit breaker tripping (the failure does not affect the trip unit protection functions).

CAUTION
HAZARD OF INCORRECT INFORMATION Replace the MicroLogic trip unit at the next maintenance interval. Failure to follow these instructions can result in injury or equipment damage.

Acknowledging the Err Screen

Acknowledge the Err screen by pressing the key twice (validation and confirmation):

The Mode key can access the measurements and settings.
The Err screen becomes the main screen if the failure is permanent.

Indication of a Major Internal Malfunction of the MicroLogic Trip Unit

Screen	Cause
	A major internal malfunction has occurred in the MicroLogic trip unit. This fault trips the circuit breaker.

CAUTION
HAZARD OF INCORRECT INFORMATION Replace the MicroLogic trip unit immediately. Failure to follow these instructions can result in injury or equipment damage.

Acknowledging the St0P Screen

The St0P screen cannot be acknowledged with the key:

It is no longer possible to close the circuit breaker
The Mode key cannot access the measurements and settings
The St0P screen becomes the main screen

Screen Firmware Download Indication

Screen	Cause
	The MicroLogic trip unit is waiting for, or is downloading, the firmware through EcoStruxure Power Commission software (duration: 3 minutes approximately). The trip unit protections are still operational. Access to measurements and settings (using the MicroLogic trip unit dials or keypad or using the communication network) is interrupted. If the boot message persists after several download attempts, replace the MicroLogic trip unit.

Screen

Cause

The MicroLogic trip unit is waiting for, or is downloading, the firmware through EcoStruxure Power Commission software (duration: 3 minutes approximately).

The trip unit protections are still operational.
Access to measurements and settings (using the MicroLogic trip unit dials or keypad or using the communication network) is interrupted.

If the boot message persists after several download attempts, replace the MicroLogic trip unit.