4.3.6 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 instal-
lation 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.
CAUTION
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
C for the 43 and 44 unit size drives is 391 m
3
/h (230
cfm). The minimum airflow required at an ambient
temperature of 45
o
C for the 52 drive is 782 m
3
/h (460 cfm).
Airflow
The necessary airflow over the heat sink must be secured.
The flow rate is in
Unit Size protection
Unit Size
Door fan(s) / Top fan airflow
Heatsink fan(s)
IP21 / NEMA 1
IP54 / NEMA 12
41 and 42
170 m
3
/h (100 cfm)
765 m
3
/h (450 cfm)
51 350HP @ 460 V, 500 & 550 HP
@ 690 V
340 m
3
/h (200 cfm)
1105 m
3
/h (650 cfm)
51 450-550 HP @ 460V, 650-750
HP @ 690 V
340 m
3
/h (200 cfm)
1445 m
3
/h (850 cfm)
IP21 / NEMA 1
61, 62, 63 and 64
700 m
3
/h (412 cfm)*
985 m
3
/h (580 cfm)*
IP54 / NEMA 12
61, 62, 63 and 64
525 m
3
/h (309 cfm)*
985 m
3
/h (580 cfm)*
IP00 / Chassis
43 and 44
255 m
3
/h (150 cfm)
765 m
3
/h (450 cfm)
52 350 HP @ 460V, 500 & 550 HP
@ 690 V
255 m
3
/h (150 cfm)
1105 m
3
/h (650 cfm)
52 450-550 HP @ 460V, 650-750
HP @ 690 V
255 m
3
/h (150 cfm)
1445 m
3
/h (850 cfm)
* Airflow per fan. Unit Sizes 5X contain multiple fans.
Table 4.3 Heatsink Air Flow
Mechanical Installation
AF-600 FP High Power Operating Instructions
61
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