Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 345)

Component Definition and Maintenance 6-55
7000 “B” Frame 7000-UM150I-EN-P – June 2013
There is a current sensor on the M+ conductor.
Above the D.C. 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.
Mounted on top of the cabinet is an air exhaust hood. The exhaust
hood must be installed to prevent foreign objects entering the drive.
If there is a redundant fan option, it is mounted on the top of this
cabinet, inside an enlarged exhaust hood.
DC Link Reactor
The DC Link maintains a ripple-free current between the rectifier
and the inverter.
The DC link reactor does not normally require service. In the event
of its replacement, it must be ensured that Rockwell Automation
approves its replacement link.
The link has been constructed to ensure that it is cooled by air drawn
through its coils.
To service the DC link, see Figure 6. 42 .
1) Ensure that source power to the drive is locked out.
2) Access to the DC link is gained by opening the door to the DC
link cabinet and removing screws that retain the vertical sheet
metal barrier in front of the DC link.
3) Disconnect the 4 power connections. The DC link is equipped
with flexible power leads.
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.
The DC link is heavy and has provision for lifting with forks of a lift
truck.