Rockwell Automation 20M LPM15 Liquid-Cooled Adjustable Frequency AC Drive FRN 2.xxx - Manual (Page 30)

1-18 Installation/Wiring
Supply and return lines should be sized for 8 gpm/120 psi service with a
maximum operating temperature of 40°C (104°F). Actual operating flow
rate through the drive is 8 gpm with a pressure drop of 10 psi.
The D-frame drive inlet pressure must not exceed 50 psi. A pressure
regulator, pressure switch, or pressure relief device is required to limit drive
inlet pressure below 50 psi under all normal and abnormal operating
conditions.
Coolant Requirements
LPM15 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. For the D-frame drive only, the coolant
must be compatible with Loctite 587 Ultra Blue
®
RTC silicone rubber.
Ultra Blue is a registered trademark of Loctite Corporation.
Corrosion Inhibitor
A corrosion inhibitor is required. The following two options are approved
sources:
1. Chemtool, Inc. (www.chemtool.com) Watertool 4435-C. The
recommended concentration of the inhibitor is 8 to 10% by volume.
2. Dow Chemical (www.dow.com) Dowtherm
®
SR-1 inhibited ethylene
glycol. The recommended concentration of the inhibitor is 25% by
volume.
Dowtherm is a registered trademark of the Dow Chemical Company.
!
ATTENTION: Operating the D-Frame drive at a pressure
greater than 50 psi will permanently damage the equipment.
!
ATTENTION: Ethylene glycol must be inhibited and silicate
free. Use of common silicate-containing, automotive-type
ethylene glycol solutions is prohibited as they may damage the
drive and cooling module equipment.