Rockwell Automation Liqui-Flo AC Power Modules User Manual
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LiquiFlo AC Power Modules, Hardware Reference Version 6.4
not be powered unless the drive is also powered. Failure to do this may result in
condensation accumulating on the casting and/or circuit boards, which could damage
the drive.
4.5.3 D-Frame Coolant Connections
D-frame LiquiFlo drives have inlet and outlet coolant connections as shown in figure
4.7. The inlet and outlet connections are tapped holes suitable for two bolt-hole
flanges. The internal threads of the tapped holes are 5/16-18 UNC-2B. The depth of
thread is 3/4". The center-to-center hole dimension is 1.625". Use the appropriate
sweat fittings to connect the two bolt-hole flanges to hoses or copper tube. For
adequate sealing, a compressed fiber gasket is required between each flange and the
drive. For bolted joint strength, use a 5/16" split ring lockwasher between each 5/16-18
bolt and flange and a nonpermanent thread locking compound on each bolt. The
flange screws should be torqued to 13.6 Nm (10 ft-lb). Supply and return lines should
be sized for 9 gpm/50 psi service with a maximum operating temperature of 40°C
(104°F). A pressure regulator or pressure relief device to control the drive inlet
pressure below 50 psi is recommended. Actual operating flow rate through the drive is
8 gpm at 10 psi. It is recommended that a flow switch be installed after the coolant
outlet to shut off the drive if the coolant flow drops below 4 gpm. It is also
recommended that the water pump not be powered unless the drive is also powered.
A corrosion inhibitor is required. An approved source is Chemtool Inc., part number
CT787-C. The recommended concentration of the inhibitor is 2% by volume.
Figure 4.5 – Coolant Connector Locations for B-Frame LiquiFlo Drives
Right Side View
Coolant Outlet
Connection
Connection
Coolant Inlet
Tube assemblies for water cooling
are provided with kit M/N 41L4060PM,
or can be user-supplied.