GE Industrial Solutions MicroVersaTrip PM - Manual (Page 20)

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 2. Setup Mode
10
2-1 Overview
This chapter describes the operation of the four
function 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 either the POWER
LEADER™ system or the Epic MicroVersaTrip Field
Programming Unit, refer to instructions published
for those systems.
Table 9 contains a list of abbreviations used
throughout the description of the setup procedures.
A A A Ab b b bb b b brrrr.... D D D Deee essssccc crrrriiiip p p pttttiiiio o o on n n n
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)
H Short-time (ST) withstand rating of breaker in
amperes.
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 9. Abbreviations used in setup procedure descriptions.
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 function
keys in each mode are listed in Table 10.
All the function keys, except for ENTER , automatically
step the Trip Unit display to the next available
option each time the key is pressed. Continued press-
ing of a key eventually loops the display back to the
initial option for that function. This is illustrated in
Figure 8 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
seconds 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 illus-
trated in Figure 9. All Trip Units provide long-time
overcurrent protection, long-time delay, and some
form of instantaneous overcurrent protection when
installed in Power Break® circuit breakers. All other
functions are optional.
If a specific set of Trip Unit functions, such as relay-
ing 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 control power
during setup. This can come from internal battery
power, from a MicroVersaTrip Portable Power Pack,
from an external +24 Vdc power supply, or by ener-
gizing the breaker to at least 20% of its sensor load.
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 t o
advance to the next function.