GE Industrial Solutions Spectra RMS Molded Case - Manual (Page 6)

GEH-702 Users Manual
5
Section 1
Read This First
Proper circuit protection depends on setting up and
installing the circuit breaker correctly. Do not attempt
to energize the circuit breaker before thoroughly
understanding all of the trip unit setup parameters
and ensuring that they are set correctly and that
associated equipment and interfaces are also installed
and connected correctly.
Spectra breakers with microEntelliGuard TM Trip Units
use rating plugs to set the breaker current rating.
Ensure that an appropriately sized rating plug is
installed into the trip unit prior to programming the
trip unit . Failure to install a rating plug can result in
unwanted trips. Installing a rating plug that is not
intended for the frame rating can result in unwanted
trips, and could result in improper protection.
When setting up the trip unit for the first time, use
external 24Vdc control power (via external control
power, test kit , or portable batter pack) to ensure that
all protection parameters are programmed correctly.
CAUTION - Removal of the rating plug while the
breaker is carrying current reduces the breaker’s
current-carrying capacity to the minimum rating
plug value of the current sensor. This may result in
unwanted tripping.
NOTE - Trip Units as received may have settings that
are undesirable for the specific application. Ensure that
settings are appropriately adjusted before energizing
the breaker.
Trip Unit Functions
This section describes the standard and advanced
protective functions and the advanced features
and communication capabilities offered on the
microEntelliGuard
TM Trip Unit.
Standard Protection Functions
Adjustable Long Time (pickup and time delay) is standard.
Three different sets of curve shapes are available with
slopes that mimic traditional MicroVersaTrip
® long time
curves (I 2 t), recursive thermal curves (thermal-mag circuit
breaker) and fuse emulation (I 4 t).
Adjustable Short Time (pickup and time delay) is
standard. An option to turn the short time function off
is also included. Multiple slope functions are available
with I
2 t IN or OUT.
Adjustable Instantaneous (pickup) is standard.
Adjustable Ground Fault (pickup and time delay) is
optional. This feature causes the breaker to TRIP when
responding to a ground fault.
Adjustable Ground Fault Alarm (pickup and time delay)
is optional. This feature causes the breaker to ALARM
(programmable output contact closure) when
responding to a ground fault (the breaker will NOT trip).
Advanced Protection Functions
Neutral Protection (pickup and time delay) is optional.
This protection function is designed to protect
the neutral from an overload condition (typical in
applications where there are harmonics).
Zone Selective Interlock (ZSI) is optional. Restraint
signals are available on Short Time, Ground Fault and
Instantaneous.
Reduced Energy Let-Through (RELT) is optional. This
feature allows a second instantaneous pickup setting
at a reduced level and is enabled via an external signal
(contact closure or communications).