Rockwell Automation Liqui-Flo 1.5 AC Power Modules V1.2 User Manual
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LiquiFlo 1.5 AC Power Modules, Hardware Reference Version 1.2
pump 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 1.5 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 1.5 Drives
Right Side View
Coolant Outlet
Connection
Connection
Coolant Inlet