Cooper QD3 - Page 53

S225-12-1
53
!
SAFETY
FOR LIFE
5. Use a Phillips head screwdriver and needle nose pliers
to disconnect the white E control winding leads, and P
leads if available, from the seven position terminal board
located on the left top of the tapchanger. (See Figure
151.)
Control winding E lead and (P lead if available) Connections.
The E lead will have E lead ID markers and the P leads if avail-
able will have P lead markers.
TABLE 18
Lead Marker and Terminal Board ID
Lead Marker Terminal Board ID
E Could be on either E1, E2, or E3
E1 E1
E2 E2
E3 E3
P If available could be on either P1, P2, or
P3
P1 P1
P2 P2
P3 P3
Figure 151.
E & P lead connections.
E3
E2
E1
G
CAUTION:
Do not remove lead ties from lead bundles hold-
ing the tap leads in a certain position. Try to keep
from moving the lead bundles from normal position.
Doing so can result, possibly, in de-electric failures.
6. Use a deep well 9/16 inch socket with ratchet or a 9/16
inch wrench to loosen and remove all lead connections
from the back of the tapchanger contact board. (See
Figure 152.)
Figure 152.
Tap leads and reactor connections.
Tap Lead Connections
Reactor P1 & P2
Connections
7. Remove the mounting bolts fastening the tapchanger
mounting bracket to the top core clamp. (See Figure
153.) Remove the tapchanger from the regulator and
place on a work surface.
Mounting Hardware
Figure 153.
Tap-changer to core clamp fastening hardware.
!