GE Industrial Solutions EHHD006A0B Hammerhead Series - Manual (Page 9)

GE Data Sheet
EHHD006A0B Hammerhead Series; DC-DC Converter Power Modules
18-75Vdc Input; 12Vdc, 6.0A, 72W Output
July 12, 2013 ©2012 General Electric Company. All rights reserved. Page 9
Thermal Considerations (continued)
The thermal reference points, T
ref
, used in the specifications
for open frame modules is shown in Figure 13. For reliable
operation, these temperatures should not exceed 125
o C.
Figure 13. T
ref
Temperature Measurement Locations for
Open Frame Module.
The thermal reference point, T
ref
, used in the specifications
for modules with a heat plate is shown in Figure 14. For
reliable operation, this temperature should not exceed
115
O C.
Figure 14. T
ref
Temperature Measurement Location for
Module with Heat plate.
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. Derating curves showing the
maximum output current that can be delivered by
each module versus local ambient temperature (T
A
)
for natural convection and up to 2m/s (400 ft./min) forced
airflow are shown in Figures 15 - 18.
OUT
PUT
C
U
RR
EN
T, I
O
(A)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 15. Output Current Derating for the Open Frame
Module; Airflow in the Transverse Direction from V
out
(-) to
V
out
(+); V
IN
=48.
O
U
TP
UT CURR
ENT, I
O
(A
)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 16. Output Current Derating for the Module with
Heat plate; Airflow in the Transverse Direction from V
out
(-)
to V
out
(+);V
IN
=48V.
OUTPUT CURRENT
, I
O
(A
)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 17. Output Current Derating for the Open Frame
Module; Airflow in the Transverse Direction from V
out
(-) to
V
out
(+); V
IN
=24V.
AIRFLOW
AIRFLOW