Danfoss VLT AQUA Instruction Manual

Also see for vlt aqua: Instructions Design guide Instruction manual Operating instructions Design guide

Contents

Danfoss VLT AQUA Instruction Manual Manual pdf 39 page image

3.3.6 Cooling and AirflowCoolingCooling can be obtained in different ways, by using the cooling ducts in the bottom and the top of the unit, by taking air in and out the back of the unitor by combining the cooling possibilities.Duct coolingA dedicated option has been developed to optimize installation of IP00/chassis frame adjustable frequency drives in Rittal TS8 enclosures utilizing thefan of the adjustable frequency drive for forced air cooling of the backchannel. The air out the top of the enclosure could but ducted outside a facility sothe heat losses from the backchannel are not dissipated within the control room reducing air-conditioning requirements of the facility.Please seeInstallation of Duct Cooling Kit in Rittal enclosures, for further information.Back coolingThe backchannel air can also be ventilated in and out the back of a Rittal TS8 enclosure. This offers a solution where the backchannel could take air fromoutside the facility and return the heat losses outside the facility thus reducing air-conditioning requirements.NOTE!A door fan or fans are required on the Rittal cabinet to remove the losses not contained in the backchannel of the drive. The minimumdoor fan airflow required at the drive maximum ambient for the D3 and D4 is 391 m^3/h (230 cfm). The minimum door fan airflowrequired at the drive maximum ambient for the E2 is 782 m^3/h (460 cfm). If the ambient is below maximum or if additional componentsand heat loss are added within the enclosure, a calculation must be made to ensure the proper airflow is provided to cool the insideof the Rittal enclosure.AirflowThe necessary airflow over the heatsink must be ensured. The flow rate is shown below.Enclosure protection Frame size Door fan/Top fan airflow Airflow over heatsinkIP21 / NEMA 1IP54 / NEMA 12D1 and D2 6,003 ft3 /h [170 m 3/h] (100 cfm) 27,015 ft 3 [765 m3 /h] (450 cfm)E1 12,006 ft3 /h [340 m3 /h] (200 cfm) 50,994 ft3/h [1,444 m3 /h] (850 cfm)IP21 / NEMA 1 F1, F2, F3 and F4 24,720 ft 3/h [700 m3/h] (412 cfm)* 34,784 ft 3/h [985 m3 /h] (580 cfm)IP54 / NEMA 12 F1, F2, F3 and F4 18,540 ft 3/h [525 m3/h] (309 cfm)* 34,784 ft 3/h [985 m3 /h] (580 cfm)IP00 / Chassis D3 and D4 9,005 ft3 /h [255 m 3/h] (150 cfm) 27,015 ft 3 [765 m3/h] (450 cfm)E2 9,005 ft3 /h [255 m 3/h] (150 cfm) 50,994 ft 3/h [1,444 m3 /h] (850 cfm)* Airflow per fan. Frame size F contain multiple fans.Table 3.2: Heatsink Air FlowNOTE!The fan runs for the following reasons:1. AMA2. DC Hold3. Pre-Mag4. DC Brake5. 60% of nominal current is exceeded6. Specific heatsink temperature exceeded (power-size dependent).Once the fan is started, it will run for a minimum of 10 minutes.VLT AQUA High Power Instruction Manual 3 How to InstallMG.20.P3.22 - VLT® is a registered Danfoss trademark 3-253