Chapter 4 – Twelve–Pulse Serial / Sequential Configurations with DCS 600
II F2
4 - 4 DCS 600 Manual for 12 – Pulse Operation
Monitoring and fault
signals
In the 12 – pulse
serial / sequential
master
In the 12 – pulse serial master, the following signal is available:
ARM ALPHA SL (2.24) Firing angle of the 12 – pulse slave
converter.
Note: If other modes are active, these signals exist as well,
but are not valid/updated.
In both the mas-
ter and the slave
converter
In both the master and the slave converter, the current control
status signals of both converters are available:
CTRL STAT MA (3.09) current control state of the master
CTRL STAT SL (3.10) current control state of the slave
B0: 1 == CURR CONTROL STAT (6.01) not zero
B1: Sign of CUR REF 3 (3.12)
B2: 1 == Bridge changeover is active
If the 12 – pulse communication timeout has elapsed without re-
ceiving a valid DDCS message from the 12 – pulse master, the
slave activates the fault
67 12P COMM (12 – pulse communication
fault).
Note: • The same timeout monitoring is done by the 12 –
pulse master, too.
• The 12-pulse slave and sequential slave must be
equipped with the current measurement circuit for the
bridge reversal control (important for Rebuild-kit).
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