Rockwell Automation 20M LPM15 Liquid-Cooled Adjustable Frequency AC Drive FRN 2.xxx - Manual (Page 29)

Installation/Wiring 1-17
Other recommendations include:
1. The allowable coolant temperature range is 4°C to 40°C (40°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.
B-Frame Coolant Connections
B-frame LPM15 drives have inlet and outlet connections as shown in
Figure 1.1 . O-ring fittings and copper tube are brazed to copper tubes
protruding from the heatsink.
Supply and return lines should be sized for 9 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.
C-Frame Coolant Connections
C-frame LPM15 drives have inlet and outlet connections as shown in
Figure 1.2 O-ring fittings and copper tube are brazed to copper tubes
protruding from the heatsink.
Supply and return lines should be sized for 5 gpm/120 psi service with a
maximum operating temperature of 40°C (104°F). Actual operating flow
rate through the drive is 5 gpm with a pressure drop of 30 psi.
D-Frame Coolant Connections
D-frame LPM15 drives have inlet and outlet connections as shown in
Figure 1.3 . O-ring fittings and copper tube are bolted to the heatsink via a
two-bolt-hole flange and compressed fiber gasket.