2
Orientation
(1) Power indicator
(2) Buttons to initiate tests
(3) LEDs to indicate sensor / CT continuity and status
Functional Testing
Preparing to test
Introduction
The WLTS hand-held test unit is the perfect companion for
service personnel and users of Siemens type WL circuit
breakers. It will verify many trip unit functions and, in most
cases, removes the need for primary injection testing.
The WLTS can perform the following functions:
• Verify the continuity of the air-core current sensors
and the energy transducers in each phase of the
circuit breaker.
• Verify connections to external air-core neutral current
sensors in 4-wire residual applications and iron-core
ground CTs (current transformers) in MDGF or other
directly ground-sensed applications.
• Verify the connection from the electronic trip unit and the
tripping solenoid.
• Verify that of each of the main overcurrent protective
functions (long-time, short-time, instantaneous, and
optional ground-fault and neutral overcurrent) will trip
the circuit breaker.
• Help verify communications to an external master by
simulating currents in each of the phases.
By design, the WLTS provides a minimally invasive solution
for circuit breaker testing, allowing maximum up-time. It
allows the operator to quickly determine the health of the
entire trip system, and quickly return the circuit breaker
to service.
The WLTS is the preferred test tool to verify compliance of
the entire trip system of the WL circuit breaker, including the
trip unit, rating plug, trip coil, current sensors, and all
associated wiring.
The WLTS has additional functionality that is beneficial during
startup and commissioning activities.
• The WLTS can be utilized as a temporary power supply
to provide control power for the WL family of trip units
facilitating the programming of the trip unit during
startup and commissioning. The WLTS will supply power
only to the trip unit and display and not any other
connected modules.
• If the circuit breaker includes a COM15 or COM16, the
WLTS can instruct the trip unit to pass along dummy load
data to the communications network, so that
communications between the WL circuit breaker and the
SCADA system can be verified.
DANGER
!
Hazardous Voltage.
Will cause death or serious injury.
Qualified personnel only.
Disconnect and lock off all power before
working on this equipment.
• Always work on de-energized
equipment.
• Always de-energize before
performing any tests, maintenance,
or repair.
• Follow safety related work practices,
as described in NFPA 70E, at all times.
NOTICE
Erroneous test results may occur when the trip
unit is powered by either:
• Load current
• External 24 vdc control power
All testing should be conducted with the primary
bus de-energized, and external 24 vdc control
power disconnected or turned off.
DANGER
!
Hazardous Voltage.
Will cause death or serious injury.
Qualified personnel only.
Disconnect and lock off all power before
working on this equipment.
• Always work on de-energized
equipment.
• Always de-energize before
performing any tests, maintenance,
or repair.
• Follow safety related work practices,
as described in NFPA 70E, at all times.
NOTICE
Erroneous test results may occur when the trip
unit is powered by either:
• Load current
• External 24 vdc control power
All testing should be conducted with the primary
bus de-energized, and external 24 vdc control
power disconnected or turned off.
1
Modified Differential Ground Fault System
Summary of Contents for WLTS
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