0614IB1701

Engaging the Masterpact MTZ2/MTZ3 ERMS Function

Engage the ERMS function to reduce protection settings so that the circuit breaker trips as soon as possible when an internal arc fault occurs. Minimizing the time between fault and trip helps to reduce the risk of injury when qualified electrical personnel are near energized equipment.

Conditions for Engaging the ERMS Function

The Energy Reducing Maintenance Setting (ERMS) function is available when the Energy Reducing Maintenance Settings Digital Module is purchased and installed on the Micrologic X control unit.

Energy Reducing Maintenance Setting (ERMS) Function Operating Principles

The ERMS function can be engaged as follows:

  • With the Masterpact MTZ Mobile App (password-protected).
    There is a digital lock between a smartphone running the Masterpact MTZ Mobile App and the Micrologic X control unit.

  • By using an external selector switch connected to the optional ERMS switch module (ESM).
    The ESM module is installed in the circuit breaker and is connected to an external selector switch, which can be padlocked. The ERMS function is engaged by turning the external selector switch.

The ERMS function can be engaged with both the Masterpact MTZ Mobile App (password-protected) and an external selector switch.

The ERMS function must be disengaged by the interface that engaged it:

  • If it is engaged on a smartphone, it must be disengaged by the same smartphone.

  • If it is engaged by the external ERMS switch connected to the ESM module, it must be disengaged by the ERMS switch.

  • If it is engaged by both a smartphone and the ERMS switch, it must be disengaged by both that smartphone and the ERMS switch.

While the ERMS function is engaged:

  • A blue ERMS LED (A) is lit on the front face of the Micrologic X control unit.

  • Quick View scrolling is interrupted and the ERMS engaged message is displayed with a blue backlight.

  • All screens, except pop-up messages, are displayed with a blue backlight.

For more information, refer to the Micrologic X - Control Unit - User Guide (see Related Documents).

Engaging the ERMS Function

NOTICE
HAZARD OF LOSS OF POWER
Confirm that the Energy Reducing Maintenance Setting (ERMS) protection settings are properly configured prior to engagement.
Failure to follow these instructions can result in loss of service due to power loss.

The ERMS can be engaged in different ways, according to the device configuration and its accessories:

Type

Accessories

Action

Through Masterpact MTZ Mobile App

Send a command from the Masterpact MTZ Mobile App to engage the ERMS function, through Bluetooth wireless communication or USB OTG connection. The action is password-protected.

Through an external selector switch connected to the ESM module

  • ERMS switch module (ESM)

  • External selector switch

Turn the external selector switch to the Engaged position

Disengaging the Energy Reducing Maintenance Setting (ERMS) Function

DANGER
HAZARD OF ELECTRICAL SHOCK, EXPLOSION, OR ARC FLASH
Prior to disengaging the Energy Reducing Maintenance Setting (ERMS) function:
  • Carefully inspect your work area, and remove any tools and objects left inside the equipment.
  • Ensure that all personnel are away from the equipment, and devices, doors, and covers are in place.
Failure to follow these instructions will result in death or serious injury.

A digital lock function establishes a digital lock between a smartphone running the Masterpact MTZ Mobile App and the Micrologic X control unit when ERMS is engaged by the smartphone. The digital lock function ensures that when the ERMS function is engaged by a smartphone, it must be disengaged by the same smartphone.

The way to disengage the ERMS function depends on how it was engaged:

Type

Accessories

Action

Through Masterpact MTZ Mobile App

Disengage the ERMS function on the same smartphone that engaged it

Through an external selector switch

  • ERMS switch module (ESM)

  • External selector switch

Turn the external selector switch to the Disengaged position

Through Masterpact MTZ Mobile App and an external selector switch

  • ERMS switch module (ESM)

  • External selector switch

  • Disengage the ERMS function on the same smartphone that engaged it

  • Turn the external selector switch to the Disengaged position

QR code for this page

Was this helpful?