GE Industrial Solutions WavePro - Manuel (Page 16)

Power+™ Trip Units
Chapter 4. Maintenance and Trouble-Shooting
10
4–1 Trip Unit Removal and Replacement
Rejection pins are installed on the rear of all Trip Units to
prevent installation of an incorrect Trip Unit into a
breaker. Do not use excessive force when installing a Trip
Unit.
WavePro Low-Voltage Power Circuit Breakers
WavePro circuit breakers are shipped from the factory with
their Trip Units installed. Removal is only necessary for
replacement.
To remove the Trip Unit, perform the following pro-
cedure:
WARNING: Before beginning this procedure, turn the
breaker
OFF , disconnect it from all voltage sources, and
discharge the closing springs, if they are charged, by
closing and then opening the breaker.
AVERTISSEMENT: Avant de commencer cette procédure,
mettre le disjoncteur en position
OFF , le déconnecter de
toute tension d’alimentation, et décharger les ressorts de
fermeture.
1. Open the breaker and remove it from the cubicle or
substructure. Place it on a suitable work surface. Note
that 3200–5000 A frame breakers must be suitably
supported so that the spring discharge mechanism is
not engaged.
2. Insert the Racking Handle (catalog number
568B731G1) and move the racking mechanism to the
TEST position, as shown on the draw-out position
indicator.
3. Remove the four screws securing the trim plate on
the breaker, then remove the trim plate.
4. Remove the six screws securing the escutheon to the
breaker. Pull the manual charging handle out part-
way, then slide off the escutcheon.
5. Pull out the locking slide on the right of the Trip
Unit mounting plate, then pull the Trip Unit out,
carefully disengaging the pins on the rear connector.
To reinstall the Trip Unit, perform the following proce-
dure:
1. Pull out the locking slide on the right of the mount-
ing plate. Push the Trip Unit into place, carefully
engaging the 50-pin connector and lining up the
rejection posts on the rear of the Trip Unit with the
holes in the mounting plate. Release the locking
slide.
2. Check that the breaker racking mechanism is still in
the TEST position. Pull the manual charging handle
out partway, then slide the handle through the slot in
the escutcheon and move the escutcheon into place.
Insert the six mounting screws and tighten to 14–20
in-lb.
3. Replace the trim ring around the escutcheon, with
the narrow side at the bottom. Insert the four mount-
ing screws and tighten to 14–20 in-lb.
4. Insert the Racking Handle and return the racking
mechanism to the DISC position, as shown by the
draw-out position indicator.
5. Reinstall the breaker into its cubicle or substructure.
4–2 Rating Plug Removal and Replacement
CAUTION: Removal of the rating plug while the breaker
is carrying current reduces the breaker’s current-carrying
capacity to approximately 25% of the current sensor
rating.
ATTENTION: Si le calibreur est retiré le disjoncteur et
traversé par un courant, le niveau de protection s’ajuste à
approximativement 25% du calibre du transformateur
d’intensité.
Interchangeable rating plugs are removed with a rating
plug removal tool, Catalog No. TRTOOL. (Suitable
equivalents are commercially available as “integrated
circuit (DIP) extractors.”) Grasp the rating plug tabs with
the extractor and pull the plug out as illustrated in Figure
13. Be sure to grab the tabs and not the front cover of the
rating plug, or the plug may be damaged.
Figure 13. Removing the interchangeable rating plug.