Rockwell Automation Publication 7000-UM202D-EN-P - May 2018 119
Power Component Definition and Maintenance Chapter 2
The door of the cabinet interlocks to remain closed until you disconnect the
fan power. The fan power disconnect handle is on the right-hand side of the
cabinet. The DC link and fan are behind the fixed fan control panels in the
medium voltage compartment.
The DC link is on the floor plate of the cabinet. Airflow barriers assembled
around the coils of the inductor direct a portion of the cooling air through the
inductor.
Power connects to the inductor via flexible leads. There are four power
connection points labeled L+, L-, M+, and M-. There is a current sensor on the
M+ conductor.
The iron core of the DC link has thermal protection.
Above the DC link is the main drive cooling fan. The primary elements of the
fan are the inlet ring, impeller and motor. The inlet ring is stationary and must
not contact the rotating impeller.
An air exhaust hood is mounted on top of the cabinet; ensure you install the
hood correctly to prevent foreign objects entering the drive. If there is a
redundant fan option, the option is mounted on the top of this cabinet, inside
an enlarged exhaust hood.
DC Link Reactor
The DC Link maintains a low ripple current between the rectifier and the
inverter. The link design ensures that it cools with air drawn through its coils.
The DC link reactor does not normally require service. In the event of its
replacement, however, Rockwell Automation must approve the replacement
link.
1. Lock out the all source power to the drive.
2. Open the DC link cabinet door and remove the screws holding the
vertical sheet metal barrier in front of the DC link.
3. The DC link is equipped with flexible power leads. Disconnect the four
power connections.
4. Remove the horizontal barrier around the DC link.
5. Remove the hardware that secures the DC link to the floor channel.
6. Disconnect the ground connection.
7. The DC link is heavy and has provision for lifting with forks of a lift
truck.
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