Rockwell Automation 20L PowerFlex 700L Liquid-Cooled Adjustable Frequency AC Drive - Manual (Page 91)

Cooling Loop Installation 4-3
PowerFlex 700L Frames 2, 3A, and 3B Liquid-Cooled AC Drives User Manual
Publication 20L-UM001E-EN-P
Liquid-to-Air Heat Exchanger
The liquid-to-air heat exchanger uses radiator technology to transfer heat from a
liquid to surrounding air. This is a simple closed loop system—it does not
require a water supply from the user. However, this system requires surrounding
air that is 5-10 °C below the maximum operating temperature of the drive.
Figure 4.3 Drive and Liquid-to-Air Heat Exchanger Plumbing Arrangement
Figure 4.4 shows a cooling loop diagram for a typical liquid-to-air heat
exchanger.
Figure 4.4 Liquid-to-Air Heat Exchanger Plumbing Diagram
The main components of the liquid-to-air heat exchanger cooling loop are
listed below.
PowerFlex 700L
Drive
Inlet
Drive
Outlet
Hose Kit
= hose or pipe connection
To
Drive
Inlet
Radiator
From
Drive
Outlet
Liquid-to-Air
Heat Exchanger
Flow
Indicator
Ambient
Sensor
Fan
On/Off
Control
TE
Drive Coolant Temp.
TE
Flow Switch
FS
IN
OUT
Level Switch
Radiator
LS
Reservoir
Drive
IN
OUT
Pump
Part Description
Fan Blows air across the radiator.
Radiator Transfers heat from liquid to air.
Ambient Sensor Senses the ambient temperature used for the dew point control.
Drive Coolant Temperature Sensor Senses the drive coolant temperature used for the dew point control.
Drive Coolant Flow Switch Measures the drive coolant flow rate.
Level Switch Senses the level of coolant in the reservoir.
Reservoir Allows for expansion of coolant.
Pump and Motor Circulates drive coolant.