GE AF-650 GP Series, Design And Installation Manual

Page: 21 / 166

2.3.2 Cooling and Airflow (125 HP and
above)
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 instal-
lation of IP00/chassis drive types in Rittal TS8 Units
utilizing the fan of the adjustable frequency drive for
forced air cooling of the backchannel. Please consult GE
for more details.
The air out of the top of the enclosure 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 losses outside the facility thus reducing air-
conditioning requirements.
CAUTION
A door fan 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
113° F [45
°
C] for the 43 and 44 unit size drives is 230 cfm
(391 m
3
/h). The minimum airflow required at an ambient
temperature of 113° F [45
°
C] for the 52 drive is 460 cfm
(782 m
3
/h).
Airflow
The necessary airflow over the heatsink must be ensured.
The flow rate is in
Table 2.2 .
Unit Size protection Unit Size protection Door fan(s) / Top fan airflow Heatsink fan(s)
IP21/NEMA 1
IP54/NEMA 12
41 and 42
100 cfm (170 m
3
/h) 450 cfm (765 m
3
/h)
51 350 HP @ 460 V, 500 & 550
HP @ 690 V
200 cfm (340 m
3
/h) 650 cfm (1105 m
3
/h)
51 450–550 hp @ 460 V, 650–
750 hp @ 690 V
200 cfm (340 m
3
/h) 850 cfm (1445 m
3
/h)
IP21 / NEMA 1 61, 62, 63 and 64
412 cfm (700 m
3
/h)* 580 cfm (985 m
3
/h)*
IP54 / NEMA 12 61, 62, 63 and 64
309 cfm (525 m
3
/h)* 580 cfm (985 m
3
/h)*
IP00 / Chassis 43 and 44
150 cfm (255 m
3
/h) 450 cfm (765 m
3
/h)
52 350 hp @ 460V, 500 & 550 hp
@ 690 V
150 cfm (255 m
3
/h) 650 cfm (1105 m
3
/h)
150 cfm (255 m
3
/h) 850 cfm (1445 m
3
/h)
* Airflow per fan. Unit Sizes 6X contain multiple fans.
Table 2.2 Heatsink Air Flow
Installation AF-650 GP
TM
Design and Installation Guide
2-2 DET-767A
2 2