PlusTM and
PM™
Units
2.
Mode
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.
Abbr. Description
xln
Rating plug ampere rating.
xcr
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 (
xln)
H
Short-time ( ST) withstand rating of
breaker in amperes.
[£]
FU NCTION
key on face of Trip Unit.
IT]
SELECT
key on face of Trip Unit.
�
VALUE
key on face of Trip Unit.
IT]
E NTER
key on face of Trip Unit.
Table
9.
Abbreviations used in setup procedure descriptions.
10
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
pressing of a key eventually loops the display back to
the initial option for that function. This is illustrated
in Figure 8 for the
FU NCTION
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 MkroVersaTrip 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
FU N CTION
key until
SETU P
appears in the upper-right corner of the Trip
Unit display. Setup mode always begins with long
time pickup. Mter a choice has been made for this
and each subsequent trip function, press
SELECT
t o
advance to the next function.
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