44 Rockwell Automation Publication 7000-UM202H-EN-P - November 2023
Chapter 2 Power Component Definition and Maintenance
Replacing the Current Transformer (CT)
1. Isolate and lock out all power to the drive.
2. Note the location of all wires and the orientation of the CT. For quick
reference when checking the orientation of the CT, look for the white dot.
3. Disconnect the wires.
4. Disassemble the bus bar to remove the CT. Remove the M10 hardware to
slide out the bus bar.
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, see Torque Requirements for
Threaded Fasteners on page 195. 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
options also include filter capacitors on the line side. See Figure 21 on page 28
(cabling cabinet for AFE rectifier) and Figure 23 on page 30 (cabling cabinet for
18-pulse 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. 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 five minutes when disconnected. Figure 37
shows a typical three-phase capacitor.
Figure 37 - Motor Filter Capacitor
ATTENTION: To prevent electrical shock, disconnect the main power before
working on the drive. Verify that all circuits are voltage-free using a hot stick
or appropriate voltage-measuring device. Failure to do so may result in
injury or death.
IMPORTANT The CT and wires must be in the proper orientation. Note the position
before disassembly.
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