09.02
Connection
Siemens AG 6SE7087-6AK85-1AA0
3-57
Rectifier/Regenerating Unit Operating instructions
Control word 2 (r551), bit 23: 12-pulse mode selection command
Associated source selection parameter: P583
Low state:
"no 12-pulse mode", i.e. there is only one "normal unit"
High state:
"12-pulse mode is selected"
The command is effective in the high state and effects the following changes with respect to the operational
behavior of a single unit (i.e. a "normal single unit" becomes a 12-pulse master or 12-pulse slave depending on
control word 2, bit 27, or the associated source selection parameter P587.i001 or i002):
♦
The P-gain of the Ud controller is halved internally according to P313 and the DC link capacitance P144 of
the 12-pulse master is halved internally but only when the 12-pulse slave reports the "run" operating state to
the 12-pulse master via r599 (bit 3 of the first SST2 receive data). Halving is not performed if this device is
an "IR unit" and the partner device signals by means of r599 (Bit5 of the 1st SST2 received data) that it is an
"infeed unit" and if regenerative feedback operation is currently active.
♦
During "forming" or "circuit identification", only one unit is permitted to carry current. This prevents firing of
the thyristors of the rectifier/regenerating bridge in the "run" operating state on the 12-pulse master or 12-
pulse slave by forcing the state r000 = "--", when the corresponding partner unit reports via r599 (bit 6 of the
first SST2 receive telegram) that "forming" or "circuit identification" is being carried out. Apart from which, on
the unit that is held in the state r000= "--", error message F061 (fault value 3, 4, 5) is suppressed.
♦
On completion of "forming" or "circuit identification" of the partner unit (i.e. with the trailing edge of bit 6 of the
first SST2 receive data), the unit switches to the operating state SWITCH-ON INHIBITED (r000=°008).
♦
On switch-on, on the 12-pulse master following the °012 operating state (test phase - earth short-circuit test),
firing of the thyristors of the rectifier/regenerating bridge by forcing the state r000 = "--" is prevented until the
12-pulse slave reports the "run" operating state via r599 (bit 3 of the first SST2 receive data) or until a
maximum waiting time of 5 s has elapsed. During this waiting time, the 12-pulse slave is given the
opportunity of carrying out the earth short-circuit test. In addition, ramping up of the pre-charging ramp
(parameter P329) is prevented.
♦
Bits 0, 1, 8 and 9 of r599 (control/status word for 12-pulse mode) are linked with control word bit 23 such that
an ON command is only passed on via r599 when control word bit 23 is 1 ("12-pulse mode is selected").
Note: The prerequisite for 12-pulse mode is that the 12-pulse master and 12-pulse slave are coupled via the
SST2 serial interface using Peer-to-Peer protocol (P688=1) and that in each case, the "control/status word for
12-pulse mode" (r599) is transmitted in word 1 of the transmission protocol (P681.i001= 599).
3.8.5
Start-up with 12-pulse mode
♦
Linking the units via SST2 RS485 interface
Mount the optional A2 submodule (C98043-A1690) on the A10 CUR electronic module (C98043-A1680) of
master and slave (see Section 9.6) and connecting an interface cable (RS485 4-core cable, see Section
3.8.7) on the 5-pole terminal block -X117 of A2.
♦
Parameterizing a unit as a 12-pulse master (see Section 3.8.3)
Following "Generate factory setting" (see Section 4.3.9.1), only the following parameters have to be set:
•
P051= 3 (expert mode)
•
P688 = 1 (select Peer-to-Peer protocol)
•
P583.i001 (or i002) = 1 (12-pulse mode is selected)
•
P573.i001 (or i002) = 6001 (only set when the 12-pulse master is also required to go into the "fault" state
in the event of a 12-pulse slave fault - see Section 3.8.6)
•
Switch off earth short-circuit test (P354 = 0), when the unit is supplied by a non-earthed supply - e.g. from
the delta winding of the 12-pulse transformer
Note: The basic setting (index i001) of the unit is used in practice for the parameterization as 12-pulse
master (with the appropriate source wiring for the ON command (P554, P555) and other external control
commands), and the reserve setting (index i002) is used to operate the unit as a stand-alone unit with user
control on-site via the OP1S or PMU.
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