PlusTM and
PM™
Units
1.
Introduction
Power Requirements
A
small amount of power is necessary to energize the
liquid crystal display (LCD) during setup, for viewing
breaker status, and for metering displays .
MicroVersaTrip PM Trip Units require external
+24
Vdc control power for proper operation. The four
sources of such power are the following:
•
Flow of current-
Breaker current sensors provide
sufficient power to energize the LCD when at
least
20%
of the sensor's ampere rating is
flowing.
•
+24
Vdc control power -
Breakers with
MicroVersaTrip PM Trip Units are supplied with
external
+24
Vdc power that, whenever present,
energizes the LCD. Some breaker models that
are configured for MicroVersaTrip Plus Trip
Units may be optionally equipped to accept an
external
+24
Vdc supply.
•
Internal Battery Power -
The Trip Unit has an
internal battery that powers the unit temporarily
when the
BATTERY
key on the display is pressed.
Battery power automatically turns off
30
seconds
after the last keypad press. The battery power
supply is disabled when any current is sensed
through the current sensors.
•
MicroVersaTrip Portable Power Pack-
The Micro
VersaTrip Portable Power Pack contains a de
power source and a jack. The LCD is energized
when the jack is plugged into the rating plug
test receptacle.
•
Power Break® II Undervoltage Release and Shunt
Trip Accessories -
When energized, these
accessories supply
+24
Vdc power to the Trip
Unit.
1-7
Trip Unit Information
Trip Unit Label Information
Following are descriptions of the various labels on
the front of the Trip Unit,
as
illustrated in Figure
5.
•
Extreme top -
circuit breaker series and/ or serial
number of the breaker, unless it is a replace
ment unit.
•
Upper-left corner-
Trip Unit-series serial number,
such
as
RMS9C0001 43.
7
TRIP UNIT DESIGNED FOR USE WITH GE
POWER BREAK II S/N:156075432
CAT#:B220LSIGPM
MicroVersaTrip PM™ Trip Unit
Ci rcuit Breaker
erial Number
s
Tr ip Unit Date
Manufacture
Code
p Unit Series
rial Number
Se
Trip Unit
alog Number
Trip Unit
nsor Rating
Se
p
Indicates
croVersaTrip
M Trip Unit
Figure
5.
Labels on front of Trip Unit.
•
Upper-right corner-
Trip Unit date of manufac
ture code, such
as
E439=.
•
Lower-left corner -
catalog number of the Trip
Unit, such
as
B220LSIGPM .
•
Lower-right corner-
sensor rating of the Trip Unit,
such
as
SENSOR (CT) = 2000A.
•
Below battery cover -
indicates whether the unit is
MicroVersaTrip Plus or MicroVersaTrip PM.
There are several other labels on the Trip Unit that
are not generally visible when the unit is plugged
into a breaker:
•
Under battery cover-
yellow caution label.
•
Side of unit-
bar-coded catalog number and bar
coded serial number of unit.
•
Rear of unit
-
yellow caution label. RMS9D-series
Trip Units also have a label to indicate which
accessory functions are activated by the rear
panel DIP switches.
Function Keys
The Trip Unit has four function keys and a battery
enable key. These are marked
F U N CT I O N , S ELECT,
VALUE, ENTER,
and
BATTERY,
as
illustrated in Figure 6.
All setup, status, and metering functions and displays
are accessed through these keys.
As
each set point is
entered, it is stored in the Trip Unit's nonvolatile
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