Danfoss FC 300 Design Manual

Also see for FC 300: Operating instructions Instruction manual Design guide Design guide Design guide

Contents

Danfoss FC 300 Design Manual Manual pdf 142 page image

7.2.6 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 frequency converters in Rittal TS8 enclosures utilizing the fan of thefrequency converter for forced air cooling of the backchannel. The air out the top of the enclosure could but ducted outside a facility so the heat losesfrom 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 loses outside the facility thus reducing air-conditioning requirements.NB!A doorfan(s) is required on the enclosure to remove the heat losses not contained in the backchannel of the drive and any additionallosses generated from other components installed inside the enclosure. The total required air flow must be calculated so that theappropriate fans can be selected. Some enclosure manufacturers offer software for performing the calculations (i.e. Rittal Thermsoftware). If the VLT is the only heat generating component in the enclosure, the minimum airflow required at an ambient temperatureof 45 oC for the D3 and D4 drives is 391 m3 /h (230 cfm). The minimum airflow required at an ambient temperature of 45oC for the E2drive is 782 m3/h (460 cfm).AirflowThe necessary airflow over the heat sink must be secured. The flow rate is shown below.Enclosure protection Frame size Door fan / Top fan airflow Airflow over heatsinkIP21 / NEMA 1IP54 / NEMA 12D1 and D2 170 m3/h (100 cfm) 765 m3 /h (450 cfm)E1 P250T5, P355T7, P400T7 340 m3/h (200 cfm) 1105 m3 /h (650 cfm)E1 P315-P400T5, P500-P560T7 340 m3/h (200 cfm) 1445 m3 /h (850 cfm)IP21 / NEMA 1 F1, F2, F3 and F4 700 m3/h (412 cfm)* 985 m3 /h (580 cfm)IP54 / NEMA 12 F1, F2, F3 and F4 525 m3/h (309 cfm)* 985 m3 /h (580 cfm)IP00 / Chassis D3 and D4 255 m3/h (150 cfm) 765 m3 /h (450 cfm)E2 P250T5, P355T7, P400T7 340 m3/h (200 cfm) 1105 m3 /h (650 cfm)E2 P315-P400T5, P500-P560T7 340 m3/h (200 cfm) 1445 m3 /h (850 cfm)* Airflow per fan. Frame size F contain multiple fans.Table 7.3: Heatsink Air FlowNB!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 minimum 10 minutes.External ductsIf additional duct work is added externally to the Rittal cabinet the pressure drop in the ducting must be calculated. Use the charts below to derate thefrequency converter according to the pressure drop.7 Mechanical Installation - Frame size D, E andF FC 300 Design Guide142 MG.33.BC.02 - VLT® is a registered Danfoss trademark7