GE Industrial Solutions Spectra RMS Molded Case - Manual (Page 15)

14
GEH-702 Users Manual
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Section 2
microEntelliGuard TM Trip Unit
Overview
The microEntelliGuard TM Trip Unit is the latest and
most advanced trip unit available in the Spectra line
of molded case circuit breakers. The trip unit design is
based on the EntelliGuard
TM Trip Unit platform. Unlike
the EntelliGuard TM Trip Unit (which is removable), the
microEntelliGuard TM Trip Unit is integral to the Spectra
G & K frame circuit breakers. The next sections of this
instruction review the trip unit’s HMI (Human Machine
Interface), power requirements, operating modes,
and communications. If you are familiar with the
EntelliGuard TM Trip Unit , then many of the following
sections will be familiar to you.
LED
Figure 5. LED Location
HMI
The microEntelliGuard TM HMI consists of a five-button
membrane keypad, a liquid crystal display (LCD), and
an LED indicator.
The membrane keypad has five pushbuttons that are used
to navigate between the various operating modes and
set up screens. The pushbuttons are raised, which helps
with programming in low-light conditions. The effects
of each pushbutton are shown in the following figure.
Pushing and holding the UP and DOWN buttons causes
the displayed value to continuously increment or
decrement. The RIGHT, LEFT, and ENTER buttons
operate with individual keystrokes. Pressing and
holding the LEFT button causes the trip unit to return to
the “home” screen.
Figure 7. Typical LCD Screen
It is important to note that any programmable value
that is changed is NOT saved until the ENTER key
is pushed and that the ENTER key is pushed before
proceeding to the next or previous programming
screen. Advancing to the next screen or returning to a
previous screen without hitting the ENTER key causes
any changes to be lost .
Liquid Crystal Display and Power Requirements
The LCD is the visual interface that displays the
operating modes and setup screens of the trip unit .
Input power is required in order to illuminate the
microEntelliGuard
TM Trip Unit’s LCD for viewing the
display screens or making changes to setup values.
Any of the following power sources can be used.
Load Current – the trip unit will “self power” and
illuminate the LCD when sufficient current passes
through the circuit breaker. Sufficient current is defined
as 20% of the breaker’s sensor rating. A breaker
with 150 amp sensors requires at least 30 amps to
illuminate the LCD.
24 Vdc Control Power – microEntelliGuard TM Trip Units
with 12-Pin and 20-Pin wiring harnesses can be
connected to 24 Vdc control power via a terminal board
connection or a junction box to illuminate the LCD.
Figure 6. Keypad Definition