GE MicroVersaTrip Plus User Manual page 45

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
S S S S y y y y m m m m p p p p t t t t o o o o m m m m
1. The Trip Unit display is
blank.
2. The Trip Unit display
flashes.
3. The Trip Unit display
flashes .
ERR
4. The trip indication
target will not clear.
5. Unit does not com-
municate with the
Monitor, POWER
LEADER Distribution
Software, or FPU.
6. Current readings are
incorrect.
7. Voltage readings are
incorrect.
8. The display is blank or
the Low Battery symbol
appears when the
key is pressed.
BATTERY
P P P P o o o o s s s s s s s s i i i i b b b b l l l l e e e e C C C C a a a a u u u u s s s s e e e e
Line current is below 20% of
the breaker sensor rating
(MicroVersaTrip Plus).
External +24 Vdc is absent
(MicroVersaTrip PM).
Can occur on Plus-style Trip
Units when the load current
fluctuates near 20% of the
breaker sensor rating.
The built-in self test has
detected an error.
Trip Unit is not in Status
mode.
The commnet wires are
shorted or improperly
connected.
FPU version is lower than 2.0.
The Trip Unit address is
incorrect.
The rating plug value was
defined incorrectly.
The potential transformer
(PT) primary voltage was
defined incorrectly.
The PT connection was
defined incorrectly.
The battery is discharged.
The battery was stored too
long with no power applied to
the Trip Unit
Chapter 5. Maintenance and Trouble-Shooting
C C C C o o o o r r r r r r r r e e e e c c c c t t t t i i i i v v v v e e e e A A A A c c c c t t t t i i i i o o o o n n n n
At least 20% of the current sensor rating, xCT , must
be flowing through the breaker to activate the display.
If not, power the Trip Unit with the internal battery
or the Portable Power Pack. The battery power supply
is disabled when any current is sensed through the
current sensors.
Check that the control power supply is present and
operational.
Power the Trip Unit with the internal battery or the
Portable Power Pack.
Replace the Trip Unit.
Press until
FUNCTION
down the key and press the
VALUE
clear the target.
Locate and repair the short or the incorrect con-
nection.
Update the FPU to version 2.0 or higher.
Check that the address assigned to the Trip Unit, as
in Chapter 2, agrees with the address at the host.
Read the X value from the rating plug name plate
and enter this as the xIn value with the rating plug
current set point procedure in Chapter 2. Do not
enter the sensor rating, S.
Read the PT primary rating from the PT name plate
and enter this value with the PT primary voltage
procedure in Chapter 2.
Follow the PT connection procedure in Chapter 2 to
enter Ph-N for a wye-connected PT primary or Ph-Ph
for a delta-connected PT.
Replace the battery.
Power the Trip Unit with external power or by
energizing the breaker for several days to freshen the
battery.
35
is displayed. Hold
STATUS
key to
SELECT