Rockwell Automation 20L PowerFlex 700L Frame 1X Liquid-Cooled Adjustable Frequency AC Drive - Manual (Page 14)

PowerFlex 700L Frame 1X Drive Installation Instructions – Publication 20L-IN013A-EN-P – June 2009
14
The following section is intended to provide guidelines for applying cooling
loops other than those recommended.
1. The allowable drive coolant temperature range is 0…60 °C
(32…140 °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 12.7 mm (0.50 in.) wall thickness.
2. The cooling loop should include a flow switch 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 on page 13 ).
3. Circulate coolant 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.
5. Install a flow measuring device at the inlet or outlet of each drive. The
coolant flow rate (LPM or GPM) must meet the requirements in Table 4
on page 13 .
6. The following types of pipe are recommended for cooling loop
connections:
•
Copper tubing, type L
•
Brass pipe
•
Stainless steel, 300 series
Important: Do not use galvanized pipe.
7. The cooling loop should have a method for draining and replacing the
coolant.
Cooling Loop Application Guidelines
!
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 will degrade
the performance of the power module chillplate.