TDK-Lambda NV350 Bedienungsanleitung Seite 20

NV350 Instruction Manual
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.
Module limitations
Series modules:
Non-standard models may have specific outputs connected in series. Connecting outputs in series may alter the
SELV classification. Refer to the comments below.
•
All outputs are SELV except under the following circumstance: Outputs connected in series are non-SELV if the
total output voltage + 30% of the max. Rated output voltage of the output with the highest rated voltage exceeds
60Vdc (the 30% addition allows for a single fault in any one individual channel).
•
If the total voltage of outputs connected in series exceeds the 60Vdc SELV limit then all outputs must be
considered non-SELV.
•
The total voltage of outputs connected in series must not exceed 160V.
•
Non-SELV outputs are hazardous and must not be made user accessible. They must be guarded or a deflector
fitted during installation to avoid a service engineer making inadvertent contact with the output terminals, or
dropping a tool onto them.
•
All outputs have operational spacings to earth and due consideration must be given to this in the end product
design.
•
Adjusting output voltage beyond the stated range may cause over voltage protection (OVP) to operate, whereby
the output will turn off. To reset OVP, turn back the output voltage adjustment and remove the mains supply for 30
seconds and then switch back on.
Page 20 of 30 17158 issue 34, October 2022