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SIMOREG DC-MASTER 6RM70 Digital converter cabinet units

Ordering guidelines

Standard cabinet

Observe the following points when ordering a cabinet without options:

  • Every standard cabinet has a setpoint potentiometer fitted in the door as well as a switch with which the setpoint input can be selected between this potentiometer and another input.
  • An outgoing circuit with a motor circuit breaker is provided for each of the fan motors of the DC motor, as listed on pages 31 and 32. In the case of fan motors with a voltage other than 400 V, it is essential to specify the fan voltage (option Y01), otherwise 400 V will be assumed as standard.
  • When using cabinet units with a mains voltage greater than 415 V, a control voltage of 3-ph. 400 V must be provided for excitation, motor fan and internal cabinet control. The current rating required for this supply is listed on pages 18 and 19 for the various types. When using cabinets for voltages up to and including 415 V, this voltage is derived from the mains supply. In addition to the switching devices for setpoint input, the door also includes an E-STOP button and the OP1S control panel for parameterization and local control of the converter. Furthermore, the door includes a switch for the control voltage in the case of units of 1500 A and above, or those with mains voltages greater than 415 V.
  • The “E-STOP” button fitted as standard is not an EMERGENCY OFF function. Only the supply (armature and field) is disconnected from the mains, and the drive coasts. The control voltage circuit is still live.
  • The converter unit has 4 digital inputs with relay couplers which are designed as standard by the customer with a 230 V coil (specify option C51 for 24 V coil).
  • Please note with standard cabinets that it is assumed that the mains voltage is the same as the rated unit voltage, i.e. 400 V, 460 V, 500 V, 690 V, 830 V. Please specify other mains voltages and frequencies using option V48.


Always pass on as much information as possible when ordering cabinet units 6RM70. When ordering cabinets for mains voltages greater than 400 V, and if a 3-ph. 400 V control voltage is not available, it is advantageous to know all data of the outgoing circuits to be supplied (field, motor fan). The matching transformers can then be designed according to the drive. The following data are generally important:

  • Contact partner for any queries.
  • Motor data (armature, field, cooling, pick-up) or, if a Siemens motor is used, its Order No. including all options.
  • Power/current/voltage of the fan motor or, if none is present (external ventilation using pipe system), option W15.
  • Specify different degrees of protection or regulations together with the order.
  • If available, specify duty cycle.


  • An additional cabinet may be necessary when combining certain options, e.g. A45 “Overvoltage protection”, W10 “Radio interference suppression filter”, mains voltage greater than 400 V without the availability of a 400 V control voltage supply with relatively large control voltage transformers.
  • The set values for the motor circuit breakers must be checked during commissioning.
  • The scope of delivery includes the hardware, but not parameterization and commissioning.
  • With a mains voltage less than or equal to 415 V/50 Hz, the motor fan and the internal cabinet supplies are derived from the primary current path and also supplied with this voltage. With mains voltages greater than 415 V/50 Hz, an external supply provided by the customer is expected for the motor fan and auxiliaries. This must be 3-ph. 400 V. When specifying the option V60 (60-Hz frequency), the control voltage provided by the customer must be 3-ph. 460 V/60 Hz.


SIMOREG converter cabinet units are tested drive converter units, which are ready to connect-up to supply variable-speed DC motors. All of the open-loop and closed-loop control functions as well as the monitoring- and auxiliary functions are handled by two microprocessors in the SIMOREG.

The cabinet units include all of the components which are required to operate a variable-speed DC motor. The cabinet units can be directly connected to 3-phase line supplies with rated voltages of 3-ph. 400 V AC, 500 V, 690 V, 830 V AC, 50 Hz.

Other supply voltages between 3-ph. 90 V AC and 830 V AC, 50 Hz as well as 60 Hz line frequencies, refer to the options.

Cabinet units are available for:

  • Single-quadrant operation with a fully-controlled six-pulse bridge circuit B6C (rated DC currents 30 A to 2000 A)
  • Four-quadrant operation with an antiparallel circuit with two fully-controlled six-pulse bridge circuits (B6)A(B6)C (rated DC currents 15 A to 2000 A).
  • Special versions for parallel connection, 12-pulse operation and field supply on request.


The cabinet units contain the following components:

SIMOREG DC-MASTER 6RA70 drive converters with microprocessor-based digital closed-loop control for the armature- and field circuits

  • Main switch (=D3-Q11)
  • Main contactor (=D3-K11)
  • Field contactor (=G1-K11)
  • Circuit-breaker
  • Motor protection circuit breaker
  • Fuses
  • Commutating reactors
  • Control voltage transformers
  • Display- and operator control elements
  • Terminals.

The components are mounted in a cabinet, and are ready to be connected-up (cabinet system: Rittal TS8). All of the components are accessible from the front of the cabinet, i.e. the cabinet units can be mounted with their rear panels to walls. For units up to 60 A, the main switch is mounted on the side.


Mode of operation

Line supply

Cabinet units can be directly connected to three-phase line supplies (refer to Technical Data for the nominal data).

The feeder cables to the drive converter must be protected against short-circuit and overload (DIN VDE 0160/DIN VDE 0100, Part 540). The cable is entered at the bottom side.

Main switch

For cabinet units from 15 to 1200 A, the three-phase line supply is connected to the unit via the main switch =D3-Q11. Cabinet units larger than 1200 A have an electrically-actuated circuit breaker =D3-Q11 and a main switch =D3-S11.

Main contactor/circuit breaker

The main contactor =D3-K11 or the circuit breaker =D3-Q11 can be switched-in or -out using a relay, mounted in the cabinet unit via the field contactor =G1-K11. A microprocessor in the drive converter automatically controls the relay at the correct instant within the power-up or power-down routine.

Circuit-breaker and motor protection circuit breaker

The main contactor = D3-K11 or the circuit breaker =D3-Q11 can be switched-in or –out using a relay, mounted in the cabinet unit via the field contactor =G1-K11. A microprocessor in the drive converter automatically controls the relay at the correct instant within the power-up or power-down routine.

Miniature circuit breaker and motor protection circuit breaker

Miniature circuit breaker and motor protection circuit-braker protect the electronics power supply, as well as the auxiliary circuits and the motor fan and the fan against short-circuit and overload.


SITOR- or SILIZED fuse links and MCBs protect the thyristors and the field rectifier of the cabinet unit as well as the auxiliary circuits and the motor fan.

Commutating reactors

Commutating reactors for the armature- and field circuit limit the commutating dips in the line supply voltage in accordance with DIN VDE 0160. They are rated for operation with 100 % rated DC current.

Control voltage transformers

A control voltage transformer 400/230 V is used for the electronics power supply and the open-loop control. For drive converter input voltages greater than 3-ph. 400 V AC, an additional auxiliary voltage supply 3-ph. 400 V AC is required on the part of the customer. Control voltage transformers can also be supplied if requested.

Display- and operator control elements

Display- and operator

control elements

The following equipment is mounted in the cabinet doors:

  • Mushroom-head pushbutton switch E-Stop, black, latching. No EMERGENCY-OFF acc. to EN 60 204-1.
  • 10-turn setpoint potentiometer
  • Mode selector switch, INTERNAL-EXTERNAL
  • OP1S operator control panel.

The operator control panel is used to

  • Set the cabinet unit parameters
  • Display measured values
  • The open-loop control is executed in the INTERNAL mode:
    • setpoint input via motorized potentiometer
    • power-on (I)
    • power-down (O)
    • jogging
    • reversing
  • Display and acknowledge error messages

“External” operating mode

In this mode, the setpoint is entered and the equipment controlled via the terminals of the unit or via serial interfaces or optional bus connection to automation systems.

Drive converters

The following drive converters are used:

  • for single-/two-quadrant operation, the SIMOREG DC MASTER 6RA70..-..S22-0.
  • for four-quadrant operation, the SIMOREG DC MASTER 6RA70..-..V62-0.

The equipment options K00 (terminal expansion) and D64 (Operating Instructions, multilingual, as well as the operator control program DriveMonitor on CD-ROM), are included in the scope of supply.


6RA70 are fully-digital, line-commutated drive converters which are connected to three-phase line supplies. They are used to control the armature- and field circuits of variable-speed DC motors. The rated DC current, specified on the equipment rating plate (= maximum permissible continuous DC current) can be exceeded up to 1.8 times in operation. The maximum overload time depends on the overload current characteristics and the preload condition of the drive converter and is drive-converter specific. The overload capacity is configured using Catalog DA 21.1.

As a result of an integrated parameterizing device, the drive units are autonomous and no additional programming- or measuring equipment is required to parameterize them.

All of the functions of the open-loop and closed-loop control for the armature- and field circuits are realized in two high-performance 16-bit microprocessors.

The closed-loop control functions are implemented as program modules in the software, which can be linked using parameters. The drive converters have an additional series of technological functions with the software option (code S00). These include, for example, higher-level technology controllers, freely-assignable adders, multipliers and dividers, logical blocks, timers, limit value monitors, etc.The T400 technology module can be used for additional technological functions, for example, winders or synchronous controls (codes D30 to D32). The cabinet units have three serial interfaces. One is used to couple the unit to the operator panel OP1S. Two additional interfaces can be freely used, e.g. to establish a unit-unit link via the peer-to-peer protocol, couple to a PC or to an automation system via the USS protocol.

The cabinet units can be connected to PROFIBUS via the CBP2 interface module (code D36).

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