GE Industrial Solutions WavePro Low-Voltage Power Circuit Breakers - Manual (Page 33)

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 4. Status Mode
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4-1 Overview
Trip Unit Status mode is selected by pressing the
FUNCTION key until STATUS appears on the display. Status
mode indicates the present status of the Trip Unit and
circuit breaker. It also displays information about trip
conditions and the trip history of the breaker. Two cate-
gories of information can be displayed: trip information
and trip operations counters.
Trip Information
Various trip information parameters are displayed when
an overcurrent trip or protective relay trip occurs.
The Status display indicates when a long trip is imminent
(breaker is in pickup). Following a trip, the Trip Unit dis-
plays a trip target to indicate the type of trip, the fault cur-
rent magnitude at trip, and the phase of the fault (where
appropriate). For adjustable-instantaneous trips, the Trip
Unit displays the instantaneous function setpoint rather
than the actual current.
Trip information is stored in the Trip Unit memory and
displayed when Trip Unit power is returned or if internal
battery power is enabled. Trip information is always avail-
able if Trip Unit power is maintained following a fault.
The Status display records trip information only for those
options ordered with the Trip Unit. For example, only
MicroVersaTrip PM Trip Units can be equipped with pro-
tective relays and thus display information about them.
Trip Operations Counters
Trip operations counters record the total number of over-
current trips. Separate internal counters are provided for
each of the following types of trips: long-time, short-time,
adjustable-instantaneous, and ground-fault. The corre-
sponding counter is incremented after any of these trips. A
maximum of 256 trips can be counted for each type of
fault, after which the counter rolls over to zero.
4-2 Status Mode Operation
This section describes each of the Status mode displays.
Normal Status Display
When the breaker is closed and its circuit energized, the
normal status display appears, as illustrated in Figure 50.
This display indicates that the Trip Unit is not in long-
time pickup and that all trip targets are cleared.
Figure 50. Trip Unit display for normal status.
Long-Time Overcurrent Pickup Display
When the long-time overcurrent function has reached
95% of the Trip Unit’s long-time current rating, xLT,
PICKUP begins to flash on the display, as illustrated in Fig-
ure 51. During the transition from 95% to 100% of the set
point, the frequency of flashing increases. When the set
point is reached, but before the time delay has expired, the
flashing stops, indicating that tripping is imminent.
Figure 51. Trip Unit status display for long-time overcurrent pickup.
Trip Target and Fault Displays
When the breaker trips, information about the trip can be
displayed in Status mode. Figure 52 illustrates a typical
fault display following a trip.
Figure 52. Typical fault display following a breaker trip.
The FAULT segment indicates that the breaker has tripped
because of an overcurrent condition or a protective relay.
This segment remains visible until it is cleared, including
displays in Setup and Meter mode. This provides an indi-
cation that trip information is available, even if other
screens are being displayed. If the trip was caused by a