Siemens SINAMICS Series Operating Instructions Manual page 599

The voltage at the armature thyristors is determined from the following measured values:
● Two phase-to-phase line supply voltages (UV, VW)
● Voltage at a thyristor (for 4Q: Anti-parallel thyristor pair) (X13/X26)
● DC voltage (Va)
Selecting the thyristor blocking voltage calculation using p50166
This parameter is only evaluated once during power up, i.e. a change only takes effect after
a restart or power up with saved parameters (p0976 = 11).
The thyristor blocking voltage calculation is only really required in just a few applications and
requires approx. 5% processor utilization; this is the reason that it is deactivated in the
factory setting.
p50166 = 0 Thyristor blocking voltage monitoring not active (factory setting)
Activation is recommended in the following cases:
● If a SIMOREG CCP is connected to the SINAMICS DCM.
● If a motor is not connected to the armature converter, but instead, a very large
inductance.
Note
The thyristor blocking voltage calculation function is available from the following version of
the power interface module
• C98043-A7105-L1-8
• C98043-A7105-L4-8
• C98043-A7106-L1-6
• C98043-A7106-L4-7
• C98043-A7107-... (Option L05): All releases
• C98043-A7108-... (Option L05): All releases
• A5E... : All releases
This information is provided on the bar code label on the printed circuit board.
If the thyristor blocking voltage calculation is activated with p50166=1 when the hardware
version of the power interface is not suitable, fault message F60058 with fault value
r0949[0]=6 appears after the next power-up with the saved parameters.
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
= 1 Thyristor blocking voltage monitoring active
Descriptions of functions
10.25 Calculating the thyristor blocking voltage
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