Page 586 - Wago_Rail-MountedTerminalBlockSystems_Volume1_2015_US.pdf

14 Tests and Testing Procedures per IEC/EN Standards (continued)

584 Mechanical Tests (continued)

• Vibration Test to IEC/EN 60068-2-6; Shipbuilding GL, LR, DNV; Railway Applications EN 61373
This test determines whether vibrations, such as those produced in the vicinity of machines or in vehicles, will permanently affect
the electrical connection, or if contact breaks will occur during vibrations. Using a vibration table, the test specimen is subjected
to vibration in each of the X, Y and Z axes (see pictures). The amplitude, acceleration and, in particular the frequency of the
vibration must vary during the test.

In a common test procedure, for example, a wide frequency band is continuously run up to 2000Hz, at different accelerations
up to 20g and different amplitudes up to 20mm. Test duration is 90 minutes per axis.

Other test types are performed using a
single fixed frequency. The exact test pro-
cedure shall vary considerably, depen-
ding on how the product is to be used.
Some test specifications require the deter- Beyond the standardized testing menti- The test is passed if:
mination of possible resonant frequenci- oned above, each market segment per- • the conductor has neither slipped out of
es, i.e., determining if resonance occurs forms additional testing. Examples inclu- the terminal block nor been damaged,
within the frequency spectrum to be de a railway company testing on rolling • the maximum permissible voltage drop
passed through. Analysis of specimen electrical equipment, or by testing by has not been exceeded
behavior under the influence of resonant shipping classification societies such as • and neither contact breaks have occur-
frequencies is performed via special tes- Germanischen Lloyd, Lloyd‘s Register of red nor a defined break time has been
ting procedure. Shipping, Det Norske Veritas. exceeded.
Though the requirements of such test pro-
cedures are particularly demanding, test The test specimen must not be damaged
arrangements are identical for all of in any way that might affect future use.
them. During vibrations, possible contact
breaks are monitored on an oscilloscope.
Voltage drop is measured before and
after the test to detect permanent failures,
i.e., checking if electrical resistance at the
clamping unit has not increased beyond
the permissible limit. The smaller this
value is, the smaller the contact resistance
of the clamping unit.