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Siemens Energy & Automation

 

 

SIMOREG DC Master Base Drive Panel   Operating Instructions 

The power section for the armature and field converters is constructed of isolated thyristor modules for 

converters rated from 15A to 850A at 460VAC-line voltage. The heat sink in this case is electrically 

isolated and at ground potential. On converters rated 1180, 1660 and 1680 amperes at 460 VAC, the 

power section for the armature circuit is constructed using disk thyristors and the heat sinks are at line 

voltage potential.  The housing and terminal covers on power connections provide protection against 

accidental contact for operators working in the vicinity. All connecting terminals are accessible from the 

front. 
All open and closed-loop drive control and communication functions are performed by two powerful 

microprocessors. Drive control functions are implemented in the software as program modules that can 

be "wired up" and changed by parameters. 
 

The rating plate of the 6RA70 power module has 2 rated currents listed on it. The first output rating is a 

IEC class I ratings and has no bearing on the base drive panel rating. The second rating is the US 

(NEMA) rating which the Base Drive Panel rating is derived from.  
The US (NEMA) rated current allows operation at this rated current followed by an overload of 150% 
for 60 seconds in a 45°C ambient. The overload can be applied no sooner than every 10 minutes. 

Base Drive Panels are designed using the US rating which means that fuses, contactors, and terminal 

blocks are sized for the rated US (NEMA) current. 
The IEC class I rating is the maximum current the power module can supply continuously with no 

overload. Because an overload is not possible the class I rated current is higher than the US rating.  

The IEC class I rating cannot be used with Base Drive Panels because the Base Drive Panel fuses, 

contactors, and terminal blocks will be overloaded. 
The microprocessor calculates the current I

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t value of the power section cyclically to ensure that the 

thyristors are not damaged in overload operation. 
 
 

One of the many features of the 6RA70 is its ability to expand its functionality modularly through the 

use of adding additional option cards inserted in the internal card rack of the power module.  A 

complete list of the option cards can be found in 6RA70 catalog available from your local Siemens 

Sales office. 
The card rack assembly contains the CUD1 microprocessor board and two additional slots for two full 

size option cards or four half-size option cards.  The back plane of the card rack assembly contains an 
EEPROM allowing the CUD1 to be replaced without reprogramming of the parameters.  Since 
additional information specific to the individual unit is programmed into the back plane of the 
card rack assembly (model #, serial #, PIN code, etc..) the card rack assembly should never be 
interchanged with another unit.  If ordering an additional back plane (part # 6RY1703-0GA01) 
the model and serial number of the power module will be required.