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NI PS-12/13 Power Supply User Manual and Specifications
Operating the NI PS-12/13
This section provides general information on the operation of the NI PS-12/13 power supply.
External Input Protection
The NI PS-12/13 power supply is tested and approved for branch circuits up to 20 A. External
protection is only required if the supplying branch has an ampacity greater than 20 A. In some
countries, local regulations might apply, so check local codes and local requirements.
If an external fuse is utilized, a minimum value is required to avoid undesired tripping of the
fuse, shown in Table 2.
Hazardous Risks
Caution
Do not use the unit without the proper earth connection (Protective Earth).
Use the PE pin on the front panel terminal block for earth connection instead of one
of the screws on the housing.
Turn the power off before working on the power supply. Protect against inadvertent
re-powering.
Make sure the wiring is correct by following all local and national codes.
Do not open, modify, or repair the unit.
Use caution to prevent any foreign objects from entering into the housing.
Do not use in wet locations or in areas where moisture or condensation can be
expected.
Service Parts
The NI PS-12/13 power supply does not contain any serviceable parts. If an internal fuse trips,
it is caused by an internal defect. If damage or malfunction occurs during operation, immediately
turn the power off and send the power supply to National Instruments for inspection.
Note
Attempting to repair or modify the power supply will void your warranty.
Table 2.
Maximum and Minimum Ampacities for External Fuses
Ampacity
B-Characteristic
C-Characteristic
Minimum
10 A
6 A
Maximum
20 A
20 A
