Descriptions of functions
10.25 Calculating the thyristor blocking voltage
SINAMICS DCM DC Converter
596 Operating Instructions, 12/2018, A5E34763375A
Measured air intake temperature (r52050[1] or r50013[1])
Is greater than the alarm threshold
Is higher than the fault threshold
Is greater than 115 °C
F60096 with fault value 2 (i.e. the
temperature sensor is short-circuited)
Is less than -25 °C
Fault F60096 with fault value 1 (i.e. the
temperature sensor is interrupted)
Use of the SINAMICS DCM in a SINAMICS DCM Cabinet drive cabinet with option L99
Option L99 provides the same functionality as option L15.
Units with firmware version 1.4 or higher:
Alarm A60082 is output if the drive performs an automatic derating as a result of the
measured air intake temperature. The response threshold for this alarm can be configured
with p50066.
The description for option L99 can be found in the operating instructions for the
SINAMICS DCM Cabinet.
Note
For devices with option L15, p50066 has no effect and A60082 is not available.
Calculating the thyristor blocking voltage
The SINAMICS DCM converter offers the possibility of continually determining the voltage
available at each individual thyristor of the armature converter. The voltage is used to identify
which armature thyristors are presently conducting and which are presently blocked.
This information is available via BICOs (see function diagram 6950).
This information is used for the following functions as input variable:
● Inverter commutation fault detection and initiation of the CCP
The thyristor that is relinquishing the current must assume the blocking voltage,
otherwise, commutation was unsuccessful.
● Torque direction changeover (sequential logic module)
Before a thyristor of the new torque direction is triggered, all thyristors associated with the
old torque direction must be blocked. The condition is evaluated in addition to the Ia=0
message.
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