Chapter 4 – Twelve–Pulse Serial / Sequential Configurations with DCS 600
DCS 600 Manual for 12 – Pulse Operation
II F2
4 - 5
4.3 Functional description of 12 – pulse serial / sequential configurations
Switch-on/switch-off
logic
The possible switch-on/switch-off options for the DCS 600 are mul-
tifarious, as are the possible switching and operator control loca-
tions, like unit terminals, overriding control system, control panel
CDP 312 and DriveWindow. So as not to lose this flexibility, we
have refrained from changing the 6 – pulse standard logic (see
chapter “2.6 Control, Trip, Emergency operation ”).
Dynamic response The dynamic response of the 12 – pulse configuration is delayed in
comparison to a 6 – pulse converter by:
• +0.5 control cycles (3,3 msec at 50 Hz) due to the 30 degree
offset mains supply to the slave
• +3 up to 4 control cycles due to the behaviour on bridge re-
versal (see “bridge reversal”)
The signals are processed independently of each other in each
converter.
Current controller in
serial / sequential
mode
Measuring the
current
The same current flows through the master and the slave.
Monitoring of the current in the slave is fully operative.
Current control
mode
Only the PI control mode supports 12 – pulse serial operation, i.e.
parameter
(43.01) must be set to [0].
The current controller is located inside the master, and generates
the firing angles for both units. The parameters for angle limitation
(20.14, 20.15) must be set to the same values for both units.
The current controller of the slave is not in use.
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