Pocket Battery

Introduction

Use the pocket battery for the local inspection and testing of MicroLogic trip units.

NOTE: The pocket battery cannot be used with the MicroLogic 2.3 trip unit installed in a ComPact NSX400K circuit breaker.

Description

The pocket battery contains two batteries which connect to the test port on MicroLogic electronic trip units.

A Inhibit thermal memory button

B 3-position slide switch:

Left = Test position; Center = OFF; Right = pocket flashlight

C Yellow LED for checking thermal memory inhibition

D Green LED for checking battery status

E Two illumination LEDs

F Two 1.5 V type AA batteries (not supplied)

G Connector for connecting to the test port on the MicroLogic trip unit

H Stylus/screwdriver

Pocket Flashlight Function

To use the module as a pocket flashlight, move the slide switch (C, above) to the pocket flashlight position (right).

Preparing the Equipment

To prepare the equipment before carrying out maintenance:

Step	Action
1	Slide open the protective cover to access the trip unit connector.
2	Click the pocket battery connector into the test port on the MicroLogic trip unit.
3	Move the slide switch to the Test position (left).
4	Check the battery status: the green LED must be on.

Inspection and Checking

To inspect the trip unit after preparing the equipment:

Step	Action
1	Check that the green Ready LED on the MicroLogic trip unit is blinking. The blinking indicates that all the MicroLogic trip unit functions are in a satisfactory operational state (internal self-test).
2	On the display unit for MicroLogic 5, 6, and 7 trip units, check the setting values by using the navigation buttons to display the protection parameters mode. Refer to DOCA0141EN, ComPact NSXMicroLogic 5/6/7 Electronic Trip Units - User Guide. NOTE: The screen backlighting is not activated in order to optimize battery life (4 hours).
3	Scroll down and check the different settings. For example, for the MicroLogic 5 trip unit: Ir (A) IN (A) (if present) long-time tr (s) Isd (A) IN (A) (if present) short-time tsd (ms) with/without I²t Ii (A) The settings can be modified.

Step

Action

Check that the green Ready LED on the MicroLogic trip unit is blinking.

The blinking indicates that all the MicroLogic trip unit functions are in a satisfactory operational state (internal self-test).

On the display unit for MicroLogic 5, 6, and 7 trip units, check the setting values by using the navigation buttons to display the protection parameters mode. Refer to DOCA0141EN, ComPact NSXMicroLogic 5/6/7 Electronic Trip Units - User Guide.

NOTE: The screen backlighting is not activated in order to optimize battery life (4 hours).

Scroll down and check the different settings. For example, for the MicroLogic 5 trip unit:

Ir (A)
IN (A) (if present) long-time
tr (s)
Isd (A)
IN (A) (if present) short-time
tsd (ms) with/without I²t
Ii (A)

The settings can be modified.

Inhibit Thermal Memory Function

The Inhibit thermal memory button temporarily cancels the thermal memory. This inhibition is necessary in order to obtain a true measurement of the long-time protection time delay tr during tripping tests by primary current injection.

To carry out the test after preparing the equipment:

Step	Action
1	Switch the circuit breaker to the I (ON) position.
2	Move the slide switch to the OFF position (center).
3	Press the button for inhibiting the thermal memory, using the stylus.
4	The yellow confirmation LED and the green LED light up. The thermal memory on the trip unit is inhibited for 15 minutes.

NOTE: Thermal memory inhibition is immediately canceled (the yellow confirmation LED goes out) if, in the course of running the test, the slide switch is moved to another position or the pocket battery is disconnected from the test port.