Danfoss iC7 Series Installation Manual page 7

Installation Guide | iC7 Series Liquid-cooled dU/dt Filter OF7U1/OF7U2
PRESSURIZED COOLING SYSTEM
Sudden release of pressure from the cooling system can cause injury.
Be careful when operating the cooling system.
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INSUFFICIENT COOLING CAPACITY
Insufficient cooling can cause the product to become too hot and thus become damaged.
To make sure that the cooling capacity of the cooling system stays sufficient, make sure that the cooling system is vented and
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that the coolant circulates properly.
DAMAGE TO COOLING SYSTEM
If the coolant circulation is stopped too soon, high-temperature components can cause rapid local increase in the coolant
temperature, which can damage the cooling system.
Do not stop the cooling system when stopping the drive. Keep the coolant circulation flowing for 2 minutes after the drive
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has been stopped.
General Information on Cooling
3.2
For more detailed information about the requirements for liquid-cooling, see the iC7 Series Liquid-cooled System Modules Design
Guide.
The product is cooled with liquid. The liquid circulation of the drive is usually connected to a heat exchanger (liquid-to-liquid or liquid-to-
air) that cools down the liquid circulating in the cooling elements. The cooling elements are made of aluminum.
If there is no risk of freezing, purified water can be used as coolant. Freezing water permanently damages the cooling system. Purified
water is demineralized, deionized, or distilled water.
The allowed antifreeze coolants are the following ethylene glycols and propylene glycols.
Ethylene glycols: DOWCAL 100 or Clariant Antifrogen N
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Propylene glycols: DOWCAL 200 or Clariant Antifrogen L
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These glycols already include corrosion inhibitors. Do not add any other inhibitor. Do not mix different glycol qualities because there can
be harmful chemical interactions.
The glycol concentration of the coolant must be 25–55% by volume, according to the specified ambient temperature. Higher
concentration reduces cooling capacity. Lower concentration results in biological growth and inadequate amount of corrosion inhibitors.
Antifreeze must be mixed with purified water.
To gain full performance of the product, the temperature of the coolant entering the system module must be a maximum of 45 °C
(113 °F). Typically, 95% of the power losses are dissipated in the coolant. It is recommended to equip the cooling circulation with
temperature supervision.
The minimum nominal flow rate of the coolant:
18.5 l/min (4.89 gal/min) with water
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24.1 l/min (6.37 gal/min) with 30% glycol
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27.8 l/min (7.34 gal/min) with 50% glycol
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The liquid volume per element:
OF7U1/OF7U2, 416 A: 0.68 l (0.180 gal)
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Danfoss Drives Oy © 2024.11
CAUTION
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NOTICE
NOTICE
Cooling Requirements
AN447722773363en-000201 / 172K1108B | 7