Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 42)

42 Rockwell Automation Publication 7000-UM151E-EN-P - January 2013
Chapter 3 Component Definition and Maintenance
5. Remove the four screws located in the base of the CT and remove the CT.
6. Replace the CT, ensuring the proper orientation. Fasten the CT securely
with the four screws in the base
7. Reconnect the ring lugs. Do not overtighten or you will break the threaded
stud. For torque specifications, refer to Torque Requirements for Threaded
Fasteners on page 255 . Replace the bus bar and tighten into place.
Filter Capacitor Cabinet Filter Capacitors
All “B” Frame drives use filter capacitors on the motor side. The AFE rectifier
option also includes filter capacitors on the line side. Refer to
Figure 10 on
page 24 (Cabling Cabinet for 18-pulse Rectifier), and Figure 11 on page 25
(Cabling Cabinet for AFE Rectifier).
The filter capacitors are three-phase, oil-filled, four-bushing units. The three-
phase capacitors are internal single-phase units connected in a Y configuration.
The neutral point of the Y connects to the fourth bushing, which is available to
use as a neutral point voltage measurement or other protection/diagnostics
purposes. Depending on the drive configuration, the fourth bushing may or may
not connect to circuitry. The metal cases of the capacitors are grounded through a
stud on the capacitor housing.
The capacitors have internal “bleeding resistors” to discharge the capacitor and
reduce its voltage below 50V in 5 minutes when disconnected.
Figure 25 shows a
typical three-phase capacitor.
Figure 25 - Motor filter capacitor