PlusTM and
PM™
_Units
5.
Maintenance and
Symptom
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
BATIERY
key is
pressed.
Possible Cause
Line current is below 20%
of the breaker sensor rating
(MicroVersaTrip Plus) .
Ex24 Vdc is absent
(MicroVersaTrip PM) .
Corrective Action
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.
Can occur on Plus-style Trip Power the Trip Unit with the internal battery or
Units when the load current the Portable Power Pack.
fluctu ates 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
36
Replace the Trip Unit.
Press
FU NCTION
until
STATUS
is displayed. Hold
down the
VALUE
key and press the
SELECT
key to
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
xln
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.
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