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8. Secondary Wiring Terminals Associated with the PT Trip Unit
8. Secondary Wiring Terminals
Associated with the PT Trip Unit
Refer to the catalogue's secondary wiring terminals for all
terminal number definitions.
Table 11. PT Secondary Terminal Block Features
Associated Feature
Name
Auxiliary Power
Us +
Us -
220VAC Digital Input
DI1
DI2
DIC
Programmable Relay
RELAY1 RELAY2
RELAY3
Output
RELAYC
Neutral Sensor
N1, N2
Ground Sensor –
G1, G2
Source Ground or
Zero Sequence
Sensing
Voltage Metering Input
Ua
Ub
Uc
Un
Zone Selective
ZIN
Interlock (ZSI)
ZOUT
ZCOM
Modbus RTU
MODBA
MODBB
MODBG
These relays can be reconfigured based on the factory default settings shown
here. See Section 5: Relay Configuration.
22
PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn
Notes
+24V auxiliary power port
2 sets of 220VAC digital inputs, and
support reading external 220VAC
signal input via communication
Normally Open (NO) contacts
Rated at 6A, 250Vac/30Vdc
Relays can be configured to
operate under different conditions;
refer to the relevant content for
details.
RELAYC is common connection
Only available on 3-Pole circuit
breakers; See Section 4.5.1
See Section 4.5.2
690VAC (L-L) and below
Directly connected from the
secondary terminal
Eaton 5V ZSI system
Inter-connected to Eaton 5V ZSI
enabled breakers in the system.
Recommended Modbus cable has
twisted-pair shield wires
9. Testing the Trip Unit and Circuit
Breaker
Testing shall be accomplished before the circuit breaker's
main circuit is energized, with the drawout circuit breaker
either in TEST or DISCONNECTED cassette position or
WITHDRAWN from the cassette.
Note: Since time-current settings are based on desired
system coordination and protection schemes, the protection
settings, if altered during any test sequence, should be reset
to their as-found values.
WARNING
Do not attempt to install, test, or perform
maintenance on equipment while it is energized.
Death or severe personal injury can result from
contact with energized equipment. De-energize the
circuit and disconnect the circuit breaker before
performing maintenance or tests.
Any tripping operation will cause disruption of service
and possible personal injury, resulting in the unnecessary
switching of connected equipment. Testing a circuit
breaker while it is in-service and carrying load current is
not recommended. Testing of a circuit breaker that results
in the tripping of the circuit breaker should be done
only with the circuit breaker in the test or disconnected
cassette positions or while the circuit breaker is on a test
bench.
The system will prevent a test if more than 5% of the
rated current (In) is sensed. A password is required to
prevent unauthorized use which could lead to the tripping
of the breaker. The default password is 0000.
9.1 Functional Opening Test (Local) via
Display
This feature allows a simple functional open test command
only from the face of the trip unit. This test is a command
sent to the microprocessor to exercise the components
such as the trip actuator and the interface to the breaker
mechanism. Such operation requires the connection to
auxiliary power.
9.2 Simulated Current Testing (Remote) via
USB/PTM Configuration Software
The PTM software or USB communication is used to simulate
testing of long delay trip, short delay trip, instantaneous trip,
and ground (earth) fault trip. The Functional Current Test
feature allows for testing on any phase including neutral.
CAUTION
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