SECTION 1 4-MicroVersaTrip® Plus and MicroVersaTrip® PM Trip Units
The MVT-Pius/MVT-PM is a solid-state direct-acting
self-powered trip device system . The system consists of
the MVT- Plus/MVT- PM programmer, current sensors and
a flux shifter trip device. Figure 1 1 0 shows location of
features on programmer. See user manual GEH-5891 A.
1 4.1 TRIP UNIT
MicroVersaTrip® Plus Trip Unit
M icroVersaTrip® Plus trip units utilize a digital , LCD
display with a four-button keypad to provide local set-up
and readout of trip settings. A 3-phase ammeter and trip
indicators are standard, as is a clear plastic cover with
provisions for sealing to allow tamper resistant installa
tion. The trip unit digitally measures the current waveform
in each phase to determine the true RMS value of the
current, regardless of the waveshape. MicroVersaTrip®
Plus trip units provide accurate, predictable overload and
short circuit protection for distribution systems that in
clude ac and de variable speed d rives, rectifiers, induction
heating, and other loads that cause high harmonic distor
tion as well as standard circuit. They provide maximum
breaker-to-breaker selectivity and custom load protec
tion. Short time and ground fault functions include the
flexibility of coordination with or without an l2t ramp and
are also available with high range instantaneous.
MicroVersaTrip® PM Trip Unit
The M icroVersaTrip® PM trip unit adds power manage
ment system capability, advanced metering, and protective
relays to the basic functions of the MicroVersaTrip® Plus.
MicroVersaTrip® PM trip units communicate directly on
the G E POWER LEADER'" communications bus.
FIG. 1 10
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 d isplays. MicroVersaTrip®
PM trip units require external 24 Vdc control power for
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 M icroVersaTrip®
PM trip units are supplied with external 24 Vdc power
that, whenever present, energizes the LCD. Some
breaker models that are configured for MicroVeraTri p
Plus trip units may b e optionally equipped t o accept
an external 24 Vdc supply.
•
MicroVersaTrip Test Kit -
The MicroVersaTrip@ Test
Kit, Cat No. TVRMS, contains a 24 Vdc power supply.
The LCD is energized whenever the test kit jack is
plugged into the test receptacle on the rating plug.
•
Micro Versa Trip battery pack
- The port a b l e
MicroVersaTri p® battery pack contains a 24 Vdc power
source and a jack. The LCD is energized when the
jack is plugged into the rating p lug test receptacle.
77
www
. ElectricalPartManuals
. com
