Placing tap-changer into neutral
1. Place a 3/8" socket and ratchet on the output shaft of
the motor; rotate the motor so that the contacts and
other components are aligned in the neutral position
2. Confirm that the regulator is in the neutral position:
A. Main movable contacts are located on the neutral
stationary contact, which is located at the 11 o’clock
position and under the reversing switch movable
contact assembly. See Figure 50.
B. The reversing movable contact is located on the
reversing neutral stationary contact. See Figure51.
Figure 50. Neutral stationary contact position for main
movable contacts.
Figure 51. Neutral position for reversing movable.
Reversing
Movable
Contact
Reversing
Neutral
Stationary
Contact
21. Place the self-locking nut onto the reversing segment
shaft and then tighten with a 9/16" wrench, while
holding the reversing switch assembly to prevent it
from moving. The nut should be tightened to a torque
of 180 to 192 lb-ins (20.3 to 21.6 Nm). See Figure 49.
22. Once the work has been completed place the tap-
changer in the neutral position.
Figure 49. Fastening reversing segment.
Hardware
Neutral
Stationary
Contact
Main
Movable
Contacts
21
QD5 QUIK-DRIVE TAP-CHANGER INSTALLATION AND MAINTENANCE INSTRUCTIONS MN225012EN March 2016
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