Rockwell Automation 20L PowerFlex 700L Liquid-Cooled Adjustable Frequency AC Drive - Manual (Page 94)

4-6 Cooling Loop Installation
PowerFlex 700L Frames 2, 3A, and 3B Liquid-Cooled AC Drives User Manual
Publication 20L-UM001E-EN-P
Cooling Loop Application
Guidelines
This section is intended to provide guidelines for applying the cooling
loops.
1. The allowable drive coolant temperature range is listed below:
• Frame 2 Drives: 0…50 °C (32…122 °F)
• Frame 3A and 3B Drives: 0…40 °C (32…105 °F)
When using coolant at a temperature below the dew point of the
surrounding air, condensation can accumulate on the drive heatsink and/
or circuit boards, which can 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 can be closed-cell foam insulation with a
minimum 12.7 mm (0.50 in.) wall thickness.
2. Include a flow switch in the cooling loop on the connection to the drive
inlet to turn off the drive if coolant flow drops below the minimum flow
required by the drive (see
Table 4.C ).
3. Circulate coolant through the drive only when the drive is also powered.
Failure to do this can result in condensation accumulating on the drive
heatsink and/or circuit boards, which could damage the drive.
4. Use an interlock from the cooling loop to stop the drive when the
cooling loop is faulted.
5. For applications requiring a closed loop coolant system, vent the system
to remove air that can otherwise degrade the performance of the drive
heatsink.
6. Install a flow measuring device at the inlet of each Converter and each
Inverter Power Module. Note that flow measuring devices are included
in the PF700L Frame 3A and 3B Complete Drive cabinets (13th
position in catalog number = A). The coolant flow rate (GPM) must
meet the requirements in
Table 4.C .
7. We recommend the following types of pipe for cooling loop
connections:
• Copper tubing, type L
• Brass pipe
• Stainless steel, 300 series
Important: Do not use galvanized pipe.
8. Provide a method in the cooling loop for draining and replacing the
coolant.
!
ATTENTION: Risk of equipment damage exists. Do not use
ferrous and plated-ferrous materials for pipe-treated water to the
power modules and drive. Use of ferrous materials degrades the
performance of the power module chillplate.