MicroVersaTrip Plus™ and PM ™Trip Units
Programming Trip Units
All M icroVersaTrip Plus and M icroVersaTrip PM trip units for
Power Break® I I breakers use the same programming key
pads. All functions ordered a re selectable and displayed.
Programming display and keypad
•
Function:
Selects the mode of the display (Setup, Metering
or Status)
•
Select:
Chooses the next item for display. All modes have
a sequential menu that allows the user to step from one
function to the next.
•
Battery:
Energizes the internal battery circuit and the LCD.
•
Value:
Allows changing a setpoint, or changes a meter
ing display from line-to-line or line-to-neutral, or select
between phases 1. 2 or 3.
•
Enter:
Stores setpoint i n the trip unit's non-volatile
memory.
Trip Targets - Overcurrent
and Ground Fault
Trip targets for protective functions use international sym
bols, and are shown on the LCD when in the Status mode.
•
Normal:
When all protective circuits are within normal
limits, the term "OK" is visible in the LCD display.
•
Long-time trip:
The long-time trip d isplay moves through
two transitions. As the current in a ny phase reaches 95%
of its setpoint, the word "PICKUP" begins to flash. As cur
rent increases, flashing frequency increases, until lOO%
of the pickup point is reached. At that moment. PICKUP
remains ON, continuously, until the long-time delay times
out. Once the breaker has tripped on long time, the symbol
" I>"
appears in the LCD display to indicate a breaker over
load. In addition to this target, the display indicates the trip
status with the word, "FAU LT." The display shows the type
of trip
''LT",
the phrase the fault occurred on, and the mag
nitude of the fault current. The trip information is displayed
until cleared by the user.
01
METER
STATUS
Long-time trip imminent
Breaker tripped on long time
22
•
Short-time and instantaneous trips:
Short-time and
instantaneous trips share the same trip target. The PICKU P
target is not illuminated, since the time interval between
pickup and tripping are so short for either function. In the
DISPLAY mode, the trip target for a short-time or instanta
neous trip is
"1»."
Breaker tripped
Breaker tripped on
o n short time
instantaneous
•
G round Fa ult Trip:
The trip target for a ground fault trip is
illumination of the letters "GF".
Breaker tripped on ground fault
Trip Operations Counter
The trip unit stores the number of trip operations for long
time, short-time, instantaneous and ground fault. U p to
256 counts of each trip operation a re stored i n memory.
Manual reset through the keypad is possible at a ny time. The
electronic trip operation counter does not store shunt trip,
undervoltage release or protective relay trips. An optional
m echanical operations counter is available that counts
each open-and-close operation of the main contacts for a ny
reason.
' "
"'"'
Breaker showing cou nter
Trip Targets - Protective Relays
Trip targets for the enabled protective relays appear in the
status screen when they occur. Symbols used are:
•
Undervoltage trip
V<
•
Overvoltage trip
V>
•
Unbalanced voltage !J.V
•
Unbalanced current !J.I
•
Power reversal
Trip Targets - Accessories
U VR and ST targets are displayed when a trip is caused by a n
undervoltage release or shunt trip accessory. The display will
indicate with a flashing target and the FAU LT segment does
not display.
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