GE Industrial Solutions AKD-20 Low Voltage Switchgear - Manuel (Page 49)

AKD-20 Low Voltage Switchgear
Chapter 5. Installing and Removing Circuit Breakers
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CAUTION: When using the switchgear hoist, do not unwind the
cable completely from the drum. To lift the breaker, turn the
hoist operating crank clockwise. To lower the breaker, turn the
hoist operating crank counter-clockwise.
ATTENTION: Il ne faut pas dérouler complètement le câble du
cylindre lorsque l’on utilisse le treuil du dispositif de
commutation. Tourner la manivelle opérant le treuil dans le sens
des aiguilles d’une montre pour soulever le disjoncteur. Tourner
la manivelle opérant le treuil dans le sens contraire des aiguilles
d’une montre pour abaisser le disjoncteur.
4. Fully withdraw rails to stops.
5. Slowly lower and guide the breaker to allow the 4 breaker
wheels to align with the rails. Remove the lifting device. The
breaker is now positioned on the draw-out rails.
6. Roll the breaker into the compartment until the racking forks
meet the racking pin, this is the DISCONNECT position. If an
incorrect breaker has been installed, the interference pins on
the breaker will interfere with the rejection pins in the
compartment prior to reaching the disconnect position. At this
point, the racking forks on the cassette are contacting the
fixed racking pins on the breaker.
7. Slide rails back into compartment. Close the compartment
door and rotate latch ¼ turn counter-clockwise.
8. Engage the racking handle by using a slot screwdriver to open
the racking shaft door by rotating it clockwise, then insert hex
manual racking handle.
9. Rotate the handle clockwise as far as it will go. As you rotate
the handle clockwise, the breaker will travel from the
DISCONNECT, through the TEST position (you will notice an
audible click), and then into the CONNECT position. The
breaker position can be seen on the indicator barrel, located
on the cassette escutcheon.
5-3 Removing the Entelliguard G Circuit
Breakers
WARNING: Do not stand under the circuit breaker during the
lowering operation.
ADVERTISSEMENT: Il est interdit de se tenir sous le disjoncteur
durant l’opération de levage.
CAUTION: When using the switchgear hoist, do not unwind the
cable completely from the drum. To lift the breaker, turn the
hoist operating crank clockwise. To lower the breaker, turn the
hoist operating crank counter-clockwise.
ATTENTION: Il ne faut pas dérouler complètement le câble du
cylindre lorsque l’on utilisse le treuil du dispositif de
commutation. Tourner la manivelle opérant le treuil dans le sens
des aiguilles d’une montre pour soulever le disjoncteur. Tourner
la manivelle opérant le treuil dans le sens contraire des aiguilles
d’une montre pour abaisser le disjoncteur.
To remove the Entelliguard G circuit breaker, proceed as follows:
1. Open the breaker by pressing the OFF/OPEN button.
2. Use a slot screwdriver the open the racking shaft door by
turning clockwise. Insert the racking handle and rotate it
counterclockwise until the breaker travels from CONNECT
through TEST to the DISCONNECT position, as shown by the
position indicator. This operation should be performed with
the door closed. If the breaker closing spring is fully charged,
it will be automatically discharged when the breaker is moved
to the WITHDRAWN position.
3. Open the compartment door and fully extend the drawout
rails. Roll breaker out to rail stops. This is the WITHDRAWN
position.
4. Before proceeding, visually check the breaker's spring charge
and close indicators to verify that breaker is open and the
springs are discharged.
5. Attach the lifting device and raise breaker off drawout rails.
6. Push the drawout rails back into the compartment.
7. Pull the breaker forward until the primary disconnects clear
the compartment.
8. Lower the breaker onto a flat surface free of protrusions that
could damage the breaker's internal parts.
Fig. 5-9. Engage the racking screw with the racking handle
1. Breaker drawout position indicator
2. Racking shaft access
3. Racking handle
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3