Options  09.02 
9-6  Siemens AG    6SE7087-6AK85-1AA0 
  Rectifier/Regenerating Unit    Operating Instructions 
9.5 Mechanical design 
Option  Description 
Busbar option Size E  For interconnecting the rectifier and regenerative bridges in operation without 
autotransformer 
(see Chapter 2, Figure 2.6) 
Front door, bottom and 
cover plates, and PC 
covers for Size E 
Increases degree of protection to IP20 
EMC screened housing  For screened cables 
Table 9.6  Mechanical options 
9.6  RS485 interface (PTP1) 
The SST2 serial interface for the basic unit is not available until submodule A2 (C98043-A1690-L1) has been 
plugged into the CUR electronics module (A10). 
With the parameterization P688=1, the peer-to-peer transmission protocol is implemented on SST2. 
The RS485 interface cable required for peer-to-peer coupling to a second unit is described in Section 3.8.7. 
 
9.6.1 Order designation 
Three different versions of this module (short designation PTP1, item number C98043-A1690-L1, equipment 
identifier A2) can be ordered. The order numbers (MLFB) for these versions are: 
1.  Module PTP1 with two spacers (1 module)  MLFB: 6SE7090-0XX85-1NA0 
2.  Standard package for 12-pulse mode (2 PTP1 modules with two  
spacers for each of two units)  MLFB: 6SE7090-0XX85-1TA0 
3.  Retrofitting package for 12-pulse mode (2 PTP1 modules with two  
spacers, 2 CUR control electronics modules and two EPROMs  
with up-to-date software for two units) MLFB: 6SE7090-0XX85-1TB0 
Versions 1 and 2 require a CUR control electronics module of hardware version 06 or higher (indicated on the 
fourth number block of the item number on the module: C98043-A1680-L1-06, C98043-A1680-L1-07, ...) and 
software version 3.0 or higher (see the label on the EPROM, fourth number block must be 30 or higher: 
V98113-A1800-A001-30, V98113-A1800-A001-31, ... The software version can also be read from parameter 
r720.01. The contents must be 3.0 or greater). 
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