TDK-Lambda NVM175 Mode D'emploi page 16

NVM175 Handbook
Output Limitations
All outputs are SELV/ES1.
Seriesing of outputs is not allowed.
Adjusting output voltage beyond the stated range may cause overvoltage protection (OVP) to operate,
whereby the output will latch off. To reset for normal operation simply adjust the potentiometer to reduce the
output voltage to within its range and cycle the input off then on. Potentiometers should be adjusted using
Bourns tool H91.
Connection details
Input Connections:
Molex 3 pin header 7A/250V MAX.
Cooling for unit
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 the
standard in question. 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
L3, L7 Common mode choke winding
C1, C4 X capacitors
C6 Capacitor
C12 Resonant capacitor
T3 Aux trx windings
L2 Boost choke winding
C7 Electrolytic capacitor
T1, T2 Transformer winding
L1 Primary choke (24V channel 1
only)
XU3, XU4, Opto-couplers on control board
XU106
U1, U2 Opto-couplers on base board
L5 Channel 1 output choke
L4 Standby output choke
J2 Input connector
J1 Output connector
Various All other electrolytic capacitors
Higher temperature limits (in brackets) may be used but product life may be reduced.
Max. Temperature
(°C)
115 (155)
100
105
105
130
120 (155)
70 (105)
130
140
100
100
125 (140)
85
105
105
90 (105)
Page 16 of 23 17814 issue 17, September 2019