12
Step 3 Connect the Cooling Loop
Drive Coolant Requirements
Recommended Coolants
Table 3 lists approved sources and recommended coolants with appropriate corrosion inhibitors for the drive loop:
Table 3 Recommended Drive Loop Coolants
(1)
(2)
Source
Interstate Chemical http://www.interstatechemical.com/contact.htm
Koolant Koolers/Dimplex Thermal Solutions http://www.koolantkoolers.com/index.php/nic=contact
Dow Chemical http://www.dow.com
Coolant Description
• NFP-50
(1)
, a 50/50 premix of propylene glycol and distilled water
• NFE-50
(1)
, a 50/50 premix of ethylene glycol and distilled water
• K-Kool-E
(1)
, ethylene glycol (available premixed with distilled water)
• Propylene glycol
(1)
also available
• Dowtherm
®
SR-1
(2)
, ethylene glycol
• Dowfrost
® (2)
, propylene glycol
Dowtherm and Dowfrost are registered trademarks of the
Dow Chemical Company
Not premixed with distilled water, and may not be available in 5 gallon quantities.
Available in 5 gallon containers.
Non-premixed coolants require a coolant-to-water mix ratio of 50% by volume.
The estimated amount of coolant needed for Allen-Bradley 20L-LL*
Liquid-to-Liquid Heat Exchangers is 15.1 liters (4 gal). This coolant estimate is based on the heat exchanger using 1.2 m (4 ft) hoses. Longer hoses require more coolant. The maximum hose length of 9.1 m (30 ft) would require up to an additional 2.8 liters (0.74 gal).
Important: Since coolant performance slowly degrades over time, the drive loop coolant should be replaced every two years and/or whenever the loop is drained for servicing.
Corrosion Inhibitor
If an approved coolant is not used, the drive coolant must consist of clean water with a corrosion inhibitor. An approved corrosion inhibitor is
Chemtool, Inc. (www.chemtool.com) part number Watertool 4435-C. The recommended concentration of the inhibitor is 8-10% by volume. Deionized water is prohibited. Use distilled water or water with less than 50 ppm concentrations of:
•
Sulfate and chloride
•
Hard water ions such as Mg++ and Ca++
ATTENTION: Ethylene and propylene glycols must be inhibited and silicate free. Use of common silicate-containing,
!
automotive-type ethylene glycol solutions is prohibited as they may damage the heat exchanger and/or drive and cooling module equipment.
PowerFlex 700L Frame 1X Drive Installation Instructions – Publication 20L-IN013A-EN-P – June 2009
The drive coolant must be compatible with the following materials:
•
Copper
•
Brass
•
Aluminum
•
Arimid fiber gasket with nitrile binder (Garlock, Inc. Blue-Gard 3000
®
)
Blue-Gard 3000 is a registered trademark of Garlock, Inc.
•
Synthetic rubber hose (Parker Hannifan Corp 801 General Purpose Hose)
•
Viton seal (Complete Drive only)
Biocide
A biocide may be needed to control biological growth. Use of a biocide is permitted. For specific recommendations, consult a reputable water treatment company.
Drive Cooling Loop Specifications
Table 4 Coolant Requirements for One Frame 1X Drive
(3)
(2)
(1)
Coolant
Temp. Range
0…60 °C
(32…140 °F)
Coolant Flow Rate
Minimum Nominal
7.57 LPM
(2 GPM)
9.46 LPM
(2.5 GPM)
Max. Particle
Size in Coolant
5 microns
Pressure Drop
(1)
From Drive Inlet to Drive
Outlet at Minimum Coolant Flow Rate
Less than 0.34 bar at 9.46 LPM, 20 °C
(Less than 5 psi at 2.5 GPM, 68 °F)
Coolant Type
WEG50
WPG50
(2)
(3)
or
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.
WEG50 equals good quality or distilled water with approved inhibited* ethylene glycol, 50% glycol by volume.
WPG50 equals good quality or distilled water with approved inhibited* propylene glycol, 50% glycol by volume.
* Inhibited ethylene glycol or propylene glycol must contain a corrosion inhibitor. See Corrosion Inhibitor on page 12 for an approved source.
13
PowerFlex 700L Frame 1X Drive Installation Instructions – Publication 20L-IN013A-EN-P – June 2009
14
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.
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.
PowerFlex 700L Frame 1X Drive Installation Instructions – Publication 20L-IN013A-EN-P – June 2009