Eaton W-VAC Series, Instructions For Installation, Operation And Maintenance

IB131009EN

Instruction

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Page 24

ondary contacts when in the disconnected position. The 
structure mounted secondary contact blocks are perma- 
nently mounted and cannot be moved out for direct con- 
nection with the breaker mounted secondary contacts. 

b) For the behind the door configuration, carefully load 
the breaker into the structure until it reaches the Test 
position. For the flush mounted configuration, carefully 
move the breaker toward the structure until it reaches 
the Test position. 

c) If a lifting yoke was used to move and/or load the 
breaker, remove the yoke at this time. 

d) For the behind the door configuration, manually 
engage the secondary contact blocks by pulling the 
movable blocks forward as far as possible. For the flush 
mounted configuration, connect the test cable to both 
the breaker and structure   secondary contact blocks. As 
soon as control power is available, the motor  will 
charge the closing springs. 

e) Close and trip the breaker several times to verify the 
closing and tripping operations 

f) Conclude by closing the breaker. 

4-9  BREAKER / COMPARTMENT INTERFACE CHECK

The following interlocks are provided to insure safe and 
correct operation: 

a) Floor Tripping and Spring Release Interlock: 
This optional interlock closes and trips the breaker if the 
closing springs are charged as the breaker is moved 
from the Test position to the Withdrawn position and 
vice versa. 

b)  Levering Interlocks: 
1.  Carriage Assembly Version: This version is used for 

single tier switchgear configurations. The levering 
crank can only be engaged when the breaker is 
open and the shoot bolt lever is lifted (Figure 

4-1b

) 

The breaker will not close manually or electrically 
while the levering crank is engaged. 

2.  Cradle Assembly Version: This version is used for 

double tier switchgear configurations. The levering 
crank can only be engaged when the breaker is 
open and the horizontal shoot bolts are engaged 
(fully extended). The breaker will not close manually 
or electrically while the levering crank is engaged. 

c) Anti-Close Interlock: This interlock prevents releasing 
the closing springs electrically or manually if the breaker 
is already closed (drawout and fixed configurations). 

d) Anti-Latch Interlock: This interlock prevents the 
breaker from being closed between the Connected and 
Test positions. 

e)  Shutter Drive Interlock: 
The metallic switchgear shutters are independently 
operated permitting them to be locked in the open posi- 
tion for servicing the primary disconnects. The locking 
system is disabled when the breaker is being connected 
permitting the shutters to operate in the normal manner. 

f) Earthing Drive Interlock: 
If the switchgear is equipped with an earthing switch, 
the breaker can only be inserted into the switchgear if 
the earthing switch is open. 

Check for the correct operation of the interlocks just 
described by starting with the breaker in the Test posi- 
tion and completing the following steps: 

Step 1: 

Engagement of Levering Crank: 

1.  For the single tier configuration carriage assembly 

version, the shoot bolt should be fitted into the first 
slot of the interlock plate located on the floor of the 
switchgear. Charge the closing springs and close 
the breaker. The slider cannot be pushed far 
enough to engage the levering crank. 

2.  For the double tier configuration cradle assembly 

version, the horizontal shoot bolts should be fitted 
into the slots of interlock plates located at the sides 
of the switchgear. Charge the closing springs and 
close the breaker. The slider cannot be pushed far 
enough to engage the levering crank. 

Step 2 :

Open the breaker, engage the levering crank and lever 
the breaker into the Connected position. Remove the 
levering crank. 

Step 3:

Close the breaker. The motor starts charging the closing 
springs if control power is available. 

Step 4:

Open the breaker, engage the levering crank and 
attempt to close the breaker manually or electrically. 
The breaker will go trip free (spring discharge but break- 
er does not close). 

Step 5:

Lever the breaker out approximately half way towards 
the Test position. Remove the levering crank and 
attempt to close the breaker by pushing the manual 
close button. The breaker will go trip free. Lever the 
breaker all the way into the Test position. The sec- 
ondary disconnects will disengage automatically.