GE Industrial Solutions WavePro Low-Voltage Power Circuit Breakers - Manual (Page 16)

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 2. Setup Mode
8
2-1 Overview
This chapter describes the operation of the four pro-
gramming keys, set point and time-delay adjustments, and
their accuracies. The setup procedures should only be
repeated if the Trip Unit or the protection characteristics
are changed, requiring different set points and time
delays.
These procedures apply to MicroVersaTrip Plus and
MicroVersaTrip PM Trip Units. Setup programming must
be performed with the rating plug installed.
For Trip Units set up through the Power Management
Control System, refer to instructions published for that
system.
Table 7 contains a list of abbreviations used throughout
the description of the setup procedures.
Abbr. Description
xIn Rating plug ampere rating.
xCT Current sensor ampere rating.
xLT Long–time (LT) current setting in amperes. Multiply LT
set point by rating plug amperes.
xLT = (LT setpoint multiplier) x (xIn)
F FUNCTION key on face of Trip Unit.
S SELECT key on face of Trip Unit.
V VALUE key on face of Trip Unit.
E ENTER key on face of Trip Unit.
Table 7. Abbreviations used in setup procedure descriptions.
WavePro circuit breakers are available with Power+™ as
well as MicroVersaTrip Plus and MicroVersaTrip PM Trip
Units. There are two different sets of abbreviations used to
describe the same TripUnit settings in the documentation
and on the Trip Unit labels. These abbreviations are listed
in Table 8.
Trip Unit Setting Abbreviations
Rating Plug rating, A xIn X
Current Sensor rating, A xCT S
Current setting, A xLT C
Table 8. Comparison of Trip Unit settings abbreviations.
2-2 Operating Modes
MicroVersaTrip Plus and MicroVersaTrip PM Trip Units
have three operating modes: Setup, Metering, and Status.
The effects of each of the four programming keys in each
mode are listed in Table 9.
All the programming keys, except for ENTER , automatically
step the Trip Unit display to the next available option each
time the key is pressed. Continued pressing of a key
eventually loops the display back to the initial option for
that function. This is illustrated in Figure 5 for the
FUNCTION key, which shows that repeatedly pressing this
key cycles the mode among Status, Metering, and Setup.
Pressing the
ENTER key more than once has no effect.
In Setup mode, depressing the VALUE key for about 5 sec-
onds activates a fast scan that rapidly displays each of the
available set points or time delays for some of the trip
characteristics.
2-3 Setup Mode Operation
The following instructions describe setup procedures for
all available Trip Unit functions. These are illustrated in
Figure 6. All Trip Units provide long-time overcurrent
protection, long-time delay, and some form of short-circuit
protection. All other functions are optional.
If a specific set of Trip Unit functions, such as relaying or
short-time overcurrent protection, has not been ordered,
that function will not appear on the Trip Unit display.
Ignore setup mode instructions for such functions.
The Trip Unit must be provided with auxiliary power dur-
ing setup. This can come from internal battery power,
from a MicroVersaTrip Portable Power Pack, or from an
external +24 Vdc power supply.
To begin the process, press the FUNCTION key until SETUP
appears in the upper-right corner of the Trip Unit display.
Setup mode always begins with long-time pickup. After a
choice has been made for this and each subsequent trip
function, press
SELECT to advance to the next function.