GE AKR-30 Series Maintenance Manual page 58

SECTION 1 2-MicroVersaTrip™ Trip Device
The MicroVersaTrip is a solid-state, direct-acting,
self-powered trip device system. The MicroVersaTrip
system consists of the MicroVersaTrip programmer,
current sensors, and a flux shifter trip device. Fig. 76
shows a block diagram of the system.
1 2. 1
PROGRAM M E R UNIT
Fig. 77 shows a typical MicroVersaTrip programmer
unit. Like the SST and ECS units, the MicroVersaTrip
provides the comparison basis for overcurrent detection
and delivers the energy necessary to trip the breaker. It
contains a programmable microelectronic processor
which incorporates nine adjustable time-current func­
tions, three mechanical fault indicators (local and
remote), a long-time pickup LED indicator (local and
remote) and a zone selective interlocking function. All
adjustable programmer functions are automatic and
self-contained requiring no external relaying, power
su pply or accessories. See Table 1 1 for trip functions
available and Table 12 for trip function characteristics. A
detailed description of each trip function is given in
publication GEA 1 0265 and GEH 4657.
1
FLUX SHIFTER
TRIP COIL
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FIG. 76
MICROVERSATRIP BLOCK DIAG RAM
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1 2.1 .1
FAULT TRIP INDICATORS
The optional fault trip indicators are similar to the SST
indicators. They are mechanical pop-out type for identify­
ing overload or short circuit over-currents faults when
breakers are ordered without integral ground fault protec­
tion. They are also available to identify overload, short
circuit and ground fault trips for breakers supplied with
integral ground fault protection.
Each target pops out when its associated trip element
operates to trip the breaker. After a trip, the popped target
must be reset by hand. However, neglecting to reset does
not affect normal operation of any trip element or prevent
the breaker from being -closed.
1 2.1 .2 REMOTE FAULT INDICATION
Remote fault indication is available in the form of a
mechanical contact which may be incorporated directly
into the customer's control circuitry. This is a Normally
open contact which is activated when its associated target
pops out. When the target is reset, the contact is returned
to its open position. Each contact is rated 0.25 amp at 1 25
VDC and 1 .0 amp ( 1 0 amp in rush) at 1 20 VAC.
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M I C ROVERSAT R I P PROGRAM M ER
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