50 Rockwell Automation Publication 7000-UM202D-EN-P - May 2018
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 193. 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 31
(cabling cabinet for AFE rectifier) and Figure 23 on page 33
(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.
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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