Rockwell Automation LPM20 Liquid-Cooled AC Drive with High Performance Drive Control - Manual (Page 27)

Installation/Wiring 1-15
Other recommendations include:
1. The allowable coolant temperature range is 0°C to 40°C (32°F to 105°F).
When using coolant at a temperature below the dew point of the
surrounding air, condensation could accumulate on the drive heatsink
and/or circuit boards and damage the drive. In this situation, install a
coolant flow regulating device and tube/hose insulation. A flow
regulating device modulates the coolant flow rate to a level that permits
the drive heatsink temperature to rise above the dew point. Insulation for
customer side tube or hose may be closed-cell foam insulation with
minimum 1/2-inch wall thickness.
2. Install a flow switch after the coolant outlet connection to shutoff the
drive if coolant flow drops below 4 gpm.
3. Circulate water through the drive only when the drive is also powered.
Failure to do this may result in condensation accumulating on the drive
heatsink and/or circuit boards, which could damage the drive.
4. For applications requiring a closed loop coolant system, ensure the
system is vented to remove air that would otherwise degrade the
performance of the drive heatsink.
Coolant Connections
LPM20 drives with High Performance Drive Control have inlet and outlet
connections as shown in
Figure 1.5 . Tube assemblies with O-ring fittings
are bolted to the heatsink.
The rated working pressure of the drive is 185 psig. Coolant supply and
return lines should be sized for 10 gpm/185 psig service with a maximum
operating temperature of 40°C (105°F). The required operating flow rate
and pressure drop is specified in
Table 1.C .
Coolant Requirements
LPM20 drives are rated for use with coolant consisting of clean water with a
corrosion inhibitor. Deionized water is prohibited. Use distilled water or
water with the following concentrations:
• Less than 50 ppm of sulfate and chloride.
• Less than 50 ppm of hard water ions such as Mg++ and Ca++.
Coolant must be properly strained and/or filtered to ensure it is free of
contamination.
The coolant must be compatible with the following materials: Copper,
brass, aluminum, and neoprene.