TDK-Lambda EFE300M Handbuch Seite 17

EFE300M Handbook
Cooling for units with customer supplied air (HN or CN, HU or CU and HC or CC options).
The following method must be used for determining the safe operation of PSUs.
The components listed in the following table must not exceed the temperatures given. To determine the
component temperatures the heating tests must be conducted in accordance with the requirements of
IEC60950-1:2005 Clause 4.5. Consideration should also be give to the requirements of other safety
standards.
Test requirements include: PSU to be fitted in its end-use equipment and operated under the most adverse
conditions permitted in the end-use equipment handbook/specification and which will result in the highest
temperatures in the PSU. To determine the most adverse conditions consideration should be given to the
end use equipment maximum operating ambient, the PSU loading and input voltage, ventilation, end use
equipment orientation, the position of doors & covers, etc. Temperatures should be monitored using type K
fine wire thermocouples (secured with cyanoacrylate adhesive, or similar) placed on the hottest part of the
component (out of any direct airflow) and the equipment should be run until all temperatures have stabilised.
Cooling for unit temperature table:
Circuit Ref. Description
J1 Input connector
L1, L2 Common mode choke winding
C7, C8 X capacitors
C9 Reservoir capacitor (electrolytic)
L3 Boost choke winding
TX1 Transformer winding
TX1 Transformer core
TX2 Transformer winding
TX2 Transformer core
TX2 Transformer braid (to pin 13)
U2, U4, U5, U6 Optocoupler
C10, C11 Channel 1 output capacitors
L6 Primary choke (24V, 28V, 40V, 48V and 50V models only)
L4 Channel 1 Output choke
XU602 Fan regulator
XQ201 Boost FET (IMS board)
Q1 or Q2 or Channel 1 output FET
Q5
XU403 Primary IC
Various All other electrolytic capacitors
See components to be monitored diagrams for location of components.
Higher temperature limits (in brackets) may be used but product life may be reduced.
Page 17 of 24
Max.
Temperature
(°C)
75
115 (130)
100
60 (105)
115 (140)
120 (130)
120 (130)
120 (130)
120 (130)
120 (130)
75 (100)
80 (105)
120 (130)
115 (130)
115 (130)
115 (130)
115 (130)
100 (130)
80 (105)
17342 issue 24, October 2018