Process Data - Siemens SIMOVERT Master Drives 6SE70 Betriebsanleitung

Start-Up
♦
Closed-loop control variant:
a) Parallel connection (see Section 3.7)
The output current can be increased by connecting up to 2 "parallel units of identical rated
current in parallel with the power section of a common rectifier of size K ("basic unit"). The
"basic unit" controls the DC-link voltage. The firing pulses of the basis unit are transmitted to
the parallel unit(s) via ribbon cable. A parallel unit does not contain a CUR electronic
module.
When connected in parallel, the load current must be reduced by 10 % with respect to the
total rated current.
Due to the use of identical power sections, commutating reactors as well as identical cable
lengths for connection to the mains supply, an almost symmetrical division of current
between the "basic unit" and the "parallel unit(s)" can be ensured.
b) 12-pulse mode (see Section 3.8)
Two common rectifiers are connected in parallel on the output side and fed on the line side
with galvanically isolated AC supplies, each displaced by 30 degrees. A common rectifier
controls the DC-link voltage and supplies a second common rectifier with the current
setpoint. The second common rectifier that is linked to the first via the SST2 serial interface
(RS485 interface option) with peer-to-peer protocol only becomes a "12-pulse slave" after
parameterization.
12-pulse mode is used to reduce the harmonic loading on the system and to increase the
performance for high-power common rectifiers.

"Process data":

♦
"Process data" are commands and setpoints from "outside" fed into the common rectifier, as
well as signals and actual values which are output from the common rectifier
Sources
- Binary inputs BE
(terminals)
- Parameterizing unit (PMU)
- Operator control panel (OP)
- Serial interfaces
(SST1, SST2, SCB, CB, TB)
- Serial interfaces
(SST1, SST2, SCB, CB, TB)
4-2
ENGLISH
Process data
Commands
"Control Word"
e.g.: "ON command"
Setpoint
chanal
Op./cl-loop
control
Setpoints
Only: Id setpoint in
12-pulse operation
Common Rectifier
- Binary outputs BA
(terminals)
- Parameterizing unit (PMU)
Messages
- Operator control panel (OP)
"status word"
- Serial interfaces
(SST1, SST2, SCB, CB, TB)
e.g.: "fault
- Analog outputs AA
- Parameterizing unit (PMU)
Actual values
- Operator control panel (OP)
- Serial interfaces
e.g. output current
(SST1, SST2, SCB, CB, TB)
Siemens AG
Common Rectifier
09.02
Destinations
(terminals)
6SE7087-6AK85-0AA0
Operating Instructions