When To Return A Relay - Siemens 7UT51 Instruction Manual

19
Maintenance and Servicing
If the protective device indicates a defect, the following
procedure is suggested:
If none of the LEDs on the front plate of the module is
on:
1. Have the modules been properly pushed-in and
locked?
2. Is the On/off switch on the front plate in the On
position?
3. Is the auxiliary voltage available with the correct
polarity and of adequate magnitude, connected to
the correct terminals ( General Diagrams in
Appendix A)?
4. Has the mini-fuse in the power supply section
blown? If appropriate, replace the fuse.
If the red fault indicator "Blocked" on the front is on
and the green ready LED remains dark, the device has
recognized an internal fault. Re-initialization of the
protection system could be tried by switching the DC
auxiliary voltage off and on again. This, however,
results in loss of fault data and messages and, if a
configuration has not yet been completed, the last
settings are not stored.
212
19.3

When to Return a Relay

If you cannot correct a problem with the relay using
the procedures described in this manual, then return
the complete relay to the manufacturer in secure,
appropriate packaging. If available, use the original
packaging to avoid damaging the relay.
Repair of defective modules is not recommended at all
because specially selected electronic components are
used which must be handled in accordance with the
procedures required for Electrostatically Endangered
Components (EEC). Furthermore, special
manufacturing techniques are necessary for any work
on the printed circuit boards in order to do not damage
the bath-soldered multilayer boards, the sensitive
components and the protective finish.
If it is unavoidable to replace individual modules, it is
imperative that the standards related to the handling of
Electrostatically Endangered Components are
observed. Should it become necessary to exchange
any device or module, the complete setting
assignment should be repeated.
7UT51 v3
PRIM-2330C