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PowerFlex 700L Technical Data

46 Publication 20L-TD001A

Coolant Requirements for One Frame 2, 3A or 3B Drive

* Inhibited ethylene glycol or propylene glycol must contain a corrosion inhibitor. See Corrosion Inhibitor on page 45 for an approved source.

Cooling Loop Application Guidelines

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.

Use the following guidelines for applying cooling loops other than those recommended.

• The allowable drive coolant temperature range is:

- Frame 2 Drive: 0°C to 50°C (32°F to 122°F)

- Frame 3A/3B Drive: 0°C to 40°C (32°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 12.7 mm (0.50 in.) wall thickness.

• 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 above).

• 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.

• An interlock from the cooling loop should be used to stop the drive when the cooling loop is faulted.

• 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.

• 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/3B Complete Drive cabinets (13th position in catalog number = A). The

coolant flow rate (GPM) must meet the requirements in the table above.

• 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.

• The cooling loop should have a method for draining and replacing the coolant.

Drive Frame Size Coolant Temperature Range Minimum Coolant Flow Rate

Pressure Drop

(2)

From Drive Inlet to Drive

Outlet at Minimum Coolant Flow Rate

(2)

Pressure drop does not include any system connections such as hoses or piping. Cooling systems must be sized to provide minimum flow considering entire system pressure drop.

Coolant Type

2 0-50°C (32-122°F) 30.3 LPM (8 GPM) 1.58 bar (23 PSI)

WEG50

(3)

WPG50

(4)

(3)

WEG50 equals good quality or distilled water with approved inhibited* ethylene glycol, 50% glycol by volume.

(4)

WPG50 equals good quality or distilled water with approved inhibited* propylene glycol, 50% glycol by volume.

3A 0-40°C (32-104°F) 30.3 LPM (8 GPM) 0.35 bar (5 PSI)

3B 0-40°C (32-104°F) 56.8 LPM (15 GPM)

(1)

Frame 3B includes separate converter and inverter power modules. A single inverter or converter power module requires a minimum flow rate of 30.3 LPM (8 GPM) at 0.35 bar (5 PSI).

0.48 bar (7 PSI)

(1)

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