Cooling Loop Installation 4-9
PowerFlex® 700L Liquid-Cooled Drive User Manual
Publication 20L-UM001D-EN-P
Cooling Loop Application
Guidelines
The following section is intended to provide guidelines for applying cooling
loops other than those recommended.
1. The allowable drive coolant temperature range is:
• 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 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.G
).
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. An interlock from the cooling loop should be used to stop the drive
when the cooling loop is faulted.
5. 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.
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.G
.
7. 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.
8. The cooling loop should have a method 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 will degrade
the performance of the power module chillplate.
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