TDK-Lambda NV350 Manual De Instrucciones página 19

NV350 Handbook
Customer Air Cooling (options C or U):
Customer Air Cooling:
The following method must be used for determining the safe operation of PSUs when C or U option (Customer Air) is
fitted, ie fan not fitted to PSU. The minimum permitted airflow for customer air cooling is 0.5m/s.
For PSUs cooled by customer supplied airflow the components listed in the following table must not exceed the
temperatures given. Additionally ratings specified for units with an internal fan must still be complied with, eg mains
input voltage range, maximum output power, module voltage / current ratings and maximum ambient temperature.
To determine the component temperatures the heating tests must be conducted in accordance with the requirements
of the appropriate 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/assembly 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.
Circuit Ref. Description
L2, L3, L4 Filter/PFC assy: Choke winding
C3, C4 Filter/PFC assy: X capacitors
L1 Filter/PFC assy: Boost choke winding
C1 Filter/PFC assy: Electrolytic capacitor
T1 Filter/PFC assy: Flyback transformer winding
RLY1 Filter/PFC assy: Relay
TX1, TX2 Modules: Power transformer windings
L1, XL1 B, BH & DB module chokes
L1 C & CM module chokes
Global option T2 Global Options: Transformer winding
Various All other choke & transformer windings
Various All <=10mm diameter electrolytic capacitors
Various All 12.5mm diameter electrolytic capacitors
TX1 DA Module: Flyback transformer windings
XTH101 Primary IMS measured adjacent to XTH101
See component layout drawings below for locations of components. Higher temperature limit (in brackets) may be
used but product life may be reduced.
Input Connections:
Input screw teminals – M3 screws with 8.25mm spacing between screw head centres.
Input IEC 60320 – rated 10A/250Vac (15A/132Vac)
Maximum torque settings for input screw terminals: M3: 0.5 – 0.6Nm
Output Connections:
Maximum Torque Settings for Output Screw Terminals: M3 – 0.5 – 0.6Nm
Modules connected in series or parallel
For non-standard models. module outputs can be connected in series. See section on Module Limitations.
Module outputs cannot be paralleled to other modules in the same power supply or paralleled to other modules in
another unit.
Paralleling of modules for redundant operation i.e. Output load does not exceed the load current of single module.
This can be achieved by isolating the outputs using orring diodes.
With this method remote sensing around these diodes is not allowed.
Max. Temperature (°C)
M4 – 1.1 – 1.3Nm
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17158 issue 32, February 2020