Schneider Electric 3.0A, 2.0A, 5.0A Ammeter, Trip Unit Testing, Micrologic Trip Unit Configuration

Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units	48049-136-05
Section 1—General Information	Rev. 01, 07/2012

ENGLISH

Trip Indicator Lights

The Ir trip indicator light (A) lights when a trip occurs because the Ir long-time pickup level was exceeded.

The Isd/Ii trip indicator light (B) lights when a trip occurs because the Isd short-time pickup or the Ii instantaneous pickup was exceeded.

The Ig trip indicator light (C) lights when a trip occurs because the Ig ground fault pickup was exceeded.

The Ap self-protection indicator light (D) lights when the trip unit overheats, the instantaneous override level is exceeded, or a trip unit power supply failure occurs.

Figure 12: Trip Indicator Lights

A B C D

06133245 6.0 A

Ammeter

The ammeter monitors and displays the circuit breaker currents. An alphanumeric screen (A) continuously displays the phase at the highest load. Navigation buttons (B) can be pressed to display the various monitored currents.

The process of checking the ammeter values can be stopped at any time. After several seconds, Micrologic trip units automatically return to displaying the phase at the highest load.

See the following section for addition information concerning the ammeter.

Figure 13:	Ammeter
	A
100 %
40 %	B
menu

Trip Unit Testing	Trip unit functions can be tested using primary injection testing or secondary
	injection testing.
Micrologic Trip Unit Configuration

Control Power

Table 6: Pickup Values

Sensor Plug Value Minimum Ground-Fault

(In)	Pickup
100–250 A	30% of Sensor Rating
400–1200 A	20% of Sensor Rating
1600–6300 A	500 A

The A trip unit was designed to be used with or without an external 24 Vdc power supply.

The following will be powered and functional even if the trip unit is not externally powered:

•Fault protection for LSIG functions. The A trip unit is fully circuit powered for fault protection.

•LED trip indication (powered by an onboard battery). The battery’s only function is to provide LED indication if all other power is off

•All display functions and trip unit features power-up with current flow on one phase greater than or equal to the values in Table 6.

•Ground-fault push-to-trip button works for testing ground fault with current flow on one phase greater than or equal to the values in Table 6.

The ground-fault push-to-trip is also functional if a Hand-Held Test Kit or Full-Function Test Kit is powering the trip unit.

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