Cooling And Airflow - GE AF-650 GP Design Manual

6.2.6 Cooling and Airflow

Cooling
Cooling 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 unit or by
combining the cooling possibilities.
Duct cooling
A dedicated option has been developed to optimize installation of IP00/chassis drive types in Rittal TS8 Units utilizing the fan of the frequency converter for forced
air cooling of the backchannel. Please consult GE for more details.
The air out the top of the Unit could but ducted outside a facility so the heat loses from the backchannel are not dissipated within the control room reducing air-
conditioning requirements of the facility.
Please contact GE for more information.
Back cooling
The backchannel air can also be ventilated in and out the back of a Rittal TS8 Unit. This offers a solution where the backchannel could take air from outside the
facility and return the heat loses outside the facility thus reducing air-conditioning requirements.
NB!
A door fan(s) is required on the enclosure to remove the heat losses not contained in the backchannel of the drive and any additional losses generated from
other components installed inside the enclosure. The total required air flow must be calculated so that the appropriate fans can be selected. Some enclosure
manufacturers offer software for performing the calculations (i.e. Rittal Therm software). If the drive is the only heat generating component in the enclosure,
the minimum airflow required at an ambient temperature of 45
o
ambient temperature of 45 C for the 52 drive is 782 m
Airflow
The necessary airflow over the heat sink must be secured. The flow rate is shown below.
Unit Size protection
IP21 / NEMA 1
IP54 / NEMA 12
IP21 / NEMA 1
IP54 / NEMA 12
IP00 / Chassis
* Airflow per fan. Unit Sizes 5X contain multiple fans.
Table 6.3: Heatsink Air Flow
o
C for the 43 and 44 unit size drives is 391 m
3
/h (460 cfm).
Unit Size
41 and 42
51 350HP @ 460 V, 500 & 550 HP @
690 V
51 450-550 HP @ 460V, 650-750 HP @
690 V
61, 62, 63 and 64
61, 62, 63 and 64
43 and 44
52 350 HP @ 460V, 500 & 550 HP @
690 V
52 450-550 HP @ 460V, 650-750 HP @
690 V
3
/h (230 cfm). The minimum airflow required at an
Door fan(s) / Top fan airflow
170 m 3 /h (100 cfm)
340 m 3 /h (200 cfm)
3
340 m /h (200 cfm)
3
700 m /h (412 cfm)*
3
525 m /h (309 cfm)*
3
255 m /h (150 cfm)
3
255 m /h (150 cfm)
255 m 3 /h (150 cfm)
AF-650 GP Design Guide
Heatsink fan(s)
765 m 3 /h (450 cfm)
1105 m 3 /h (650 cfm)
3
1445 m /h (850 cfm)
3
985 m /h (580 cfm)*
3
985 m /h (580 cfm)*
3
765 m /h (450 cfm)
3
1105 m /h (650 cfm)
1445 m 3 /h (850 cfm)
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