3
Remove the trip unit cover (Catalog number WLTSC55 or
WLTSC76), if present, and the cover over the X25 test port.
Record the settings of the trip unit and set long time pickup
(I
R
) to 1.0 x I
n
.
Connecting to the trip unit
1. Plug the ribbon cable into the test port
2. Plug the ribbon cable into the tester
3. Plug in the power cord
1. ETU test port
2. Ribbon cable
3. Tester power cord
After applying power to the WLTS, it will begin to communi-
cate with the trip unit and verify that critical subsystems are
operational. Once all checks have been successfully com-
pleted, the “ETU STATUS” LED will turn on, and remain lit until
a function button is pressed. A flashing “ETU STATUS” LED is
indication of an error. A full list of the error codes is found in
Table 1.
Table 1
Indicator
Definition
1x
WLTS in need of repair
2x
Trip unit needs replacement
1
3x
Trip unit externally powered
WLTS connected while powered
4x
Parameter conflict
Current sensor not connected
Incorrect rating plug
Missing rating plug
5x
Tripping solenoid not connected
The start-up tests can be repeated at any time by holding
down the "START" button for three seconds.
Testing the current and energy sensors
To test the current sensors and energy transducers, press the
"START" button.
A lit-up LED confirms the proper operation of the
corresponding sensor/transducer. If an LED flashes, the
corresponding sensor/converter is not present, not properly
connected, or is in need of replacement.
Whether a flashing N- or G-LED is due to a non-conforming
current sensor depends the position of the draw-out circuit
breaker when tested and the ground fault scheme being
used. In the draw out position, external sensors are not
connected and both N- and G-LEDs will flash. A circuit breaker
used in a 3-wire residual GF scheme will always show flashing
N- and G-LEDs because there are no external sensors
connected, regardless of the position. A circuit breaker used
in a 4-wire residual GF scheme will show a flashing G-LED
because there is no iron-core G CT connected. A circuit
breaker used in an MDGF GF scheme may show a flashing
N-LED depending on whether a neutral current sensor is
in use.
2
The "ETU STATUS" LED may blink twice when the trip unit is powered by an
external power supply. This is not an error. It is recommended that the trip unit
be tested without external control power.
Summary of Contents for WLTS
Page 7: ...7 Notes ...
