Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control - Manual (Page 215)

Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014 215
Commissioning Chapter 4
Heat Exchanger Checks
The PowerFlex “C” Frame drive requires a heat exchanger to transfer heat from
the drive coolant to an external medium. There should be connections from the
drive pumping cabinet to the heat exchanger. Ensure that these connections are
completed and attached to the proper locations (inlet / outlet) on both the drive
and the heat exchanger.
These connections should be made from stainless steel.
The customer should not be using lead solder with the connections, as the
coolant will deteriorate this connection over time.
When making connections to the drive from the heat exchanger, ideally the
connections or the heat exchanger should not be at an elevation higher than the
internal drive piping (below inlet of reservoir). This allows the drive to remove
any trapped air in the system. If the heat exchanger is at a higher elevation, then
air release valves should be installed at the highest point.
Figure 196 - Typical Liquid-to-air Heat Exchanger
The tubing to the heat exchanger should have been cleaned by the installation
personnel. If they are still in the process of installation you should verify that the
piping will be cleaned. Otherwise the filling process will probably produce a lot
of debris in the first mesh filter and may require several cleanings.
On a liquid-to-air heat exchanger, there will be fans on the heat exchanger to
move the air over the cooling tubes within the exchanger. Ensure these fans are
wired properly per the electrical print.
On a liquid-to-liquid heat exchanger, process water will be required to transfer
heat from the drive coolant. The water temperature, pressure and flow rate are as
TIP The largest heat exchanger is 287 cm (113 inches) tall.
Fan
Coolant Inlet
Coolant Outlet