Siemens SINAMICS DCM Manual page 598

10.33.3 Thyristor diagnostics
SINAMICS DCM can perform a self-test of its own power unit. As a consequence, defective
thyristors and other faults can be detected in the power unit.
Note 1:
Thyristor diagnostics cannot be used when SINAMICS DCMs are connected in series.
Note 2:
In parallel connections of SINAMICS DCMs (6-pulse or 12-pulse), the thyristor diagnostics
must only be selected on the master. The thyristor diagnostics are then performed first on
the master and then automatically in succession on all slaves. If a faulty thyristor is detected
on a SINAMICS DCM, the appropriate fault message is issued on this SINAMICS DCM and
not on the master on which the thyristor diagnostics was started.
Note 3:
If a thyristor is fused, in 6-pulse parallel connection it is not possible to identify in which of the
parallel devices the defective thyristor is located. The corresponding fault message occurs
on the master.
Selecting thyristor diagnostics:
Thyristor diagnostics are performed during the switch-on procedure. Parameter p50830 can
be used to select for which switch-on procedures thyristor diagnostics is performed.
p50830
Thyristor diagnostics sequence:
At each switch-on procedure, starting from operating state o7 the drive goes into state o0.
During thyristor diagnostics, it remains in operating state o3 (see parameter r50000).
Thyristor diagnostics takes approx. 30 s.
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
= 0 never
= 1 at the first ON after switching-on the electronics
= 2 at each ON
= 3 at the next ON (p50830 is then reset to 0)
ac.maher.co.ir
Descriptions of functions
10.33 Diagnostics
599