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3. Power Xpert® Release Trip Units
3.1 Status Indicator
PT trip unit has an indicator at the top right labeled
"STATUS" . During normal operation, this indicator blinks
green (on and off approximately once each second),
indicating that the trip unit is operating normally.
Figure 4. Status Indicator.
The status indicator blinks red or orange if the trip unit
detects an internal problem.
Blinking red indicates that one or more below problems
have occurred, including:
Damaged trip actuator coil
•
Firmware error
•
Calibration error
•
Mechanism error, immediate action must be taken to
•
rectify the problem and/ or replace the trip unit.
Blinking orange indicates that one or more below
problems have occurred, including:
Battery low or not connected
•
Auxiliary power voltage low
•
Overload
•
Thermal memory alarm
•
Over temperature alarm
•
Clock error
•
See Appendix A - "Troubleshooting" for details.
3.2 Password Protection Functionality
The cybersecurity of your system is critical. The PT
electronic trip unit has a four-digit password for protection.
To change non-rotary switch settings, the password is
required.
Digitally configured setpoints are password protected to
reduce risk of unauthorized changes. You must enter the
correct password (factory default is "0000") in the "Edit
Settings" menu to change non-rotary switch settings (see
table 2 for more information).
4
PT 10 TrIP UnIT User ManUal Power TrIP (PT) UnITs MN013021EN January 2024 www.eaton.com
3.3 Pickup / Cause-of-Trip Indicators
There are four pickup/cause-of-trip indicators on the face
of the trip unit labeled "LONG" , "SHORT" , "INST" , and
"GND" .
Figure 5. Pickup/Cause-of-Trip Indicators and Reset
Status
Indicator
Cause-of-Trip
Indicators
The appropriate cause-of-trip indicator illuminates when
a current level pickup setting is exceeded. After a trip
event, the indicator blinks (one second on, three seconds
off).The indicators can be cleared by pressing the RESET
button.
Following is a list of conditions detected and displayed by
the cause-of-trip indicators.
"LONG"
•
"SHORT"
•
"INST"
•
"GND"
•
3.4 Rotary Switches
Up to 7 rotary switches can be found on the PT 10 trip
unit's front panel. These rotary switches set protection
settings using a surrounding legend indicating the value.
These are the core protection settings. Each switch has
ten positions and is set to achieve the appropriate trip-
curve characteristics. The "PICKUP" switches set the
levels as a function of the breaker ratings. The "TIME"
switches set the response in seconds. Each switch can
be set using a small screwdriver, the arrow pointing to the
selected value.
Pickup/
– Blinking indicates a Long Delay trip or
over-temperature trip has occurred.
– Short Delay trip or mechanism error.
– Instantaneous trip, Making Current
Release trip, High Instantaneous trip
has occurred.
– Ground trip or Ground alarm condition
has occurred.
Reset
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