Model Number:

Product Type:

Type:Industry Automation

Category:Home/DC Drive/SIEMENS DC Drives/Simoreg DC Master

Plance of Origin:Made in Germany

Warranty:All parts new or reconditioned are covered by AoteWell 12 month warranty





Series 6RA70 SIMOREG DC MASTER Base Drive Panels are complete drive assemblies ready to be installed and operated. They include a 3-phase armature converter, single-phase field converter, main contactor, protective semiconductor fuses, control power transformer, and power / control terminals.

Base Drive Panels are fully digital, compact units which supply the armature and field of variablespeed DC drives with rated armature currents from 15A to 1680A. The motor field circuit can be supplied with DC currents of up to 85A (current levels depend on the armature rated current).

Series 6RA70 SIMOREG DC MASTER converters are characterized by their compact, space-saving construction. Their compact design makes them particularly easy to service and maintain since individual components are readily accessible. The electronics box contains the basic electronic circuitry as well as any supplementary option boards.

6RA70 Series Base Drive

Safety information WARNING
Hazardous voltages and rotating parts are present in this electrical equipment during
operation. Non-observance of the safety instructions can result in death, severe
personal injury or substantial property damage.

Only qualified personnel should work on or around the equipment after first becoming
thoroughly familiar with all warning and safety notices and maintenance procedures contained
herein. The successful and safe operation of this equipment is dependent on proper handling,
installation, operation and maintenance.


1. Trained and authorized to energize, de-energize, clear, ground and tag circuits and equipment in
accordance with established safety procedures.
2. Trained in the proper care and use of protective equipment in accordance with established
safety procedures
3. Trained in providing first aid

Spare Parts

An excellent stock of drive products spare parts is maintained at the aotewell factory.

Should you need assistance , To contact call:(+86)755.8660.6182

SIMOREG DC-MASTER 6RA70 Digital Chassis Converters

Power section and cooling

SIMOREG 6RA70 converters are fully digital, compact units for connection to a three-phase AC supply. They in turn supply the armature and field of variable-speed DC drives. The range of rated DC currents extends from 15 A to 3000 A, but can be expanded by connecting SIMOREG converters in parallel.

Converters for single-quadrant or four quadrant operation are available to suit individual applications. As the converters feature an integrated parameterization panel, they are autonomous and do not require any additional parameterization equipment. All open-loop and closed-loop control tasks as well as monitoring and auxiliary functions are performed by a microprocessor system. Setpoints and actual values can be applied in either analog or digital form.

SIMOREG 6RA70 converters are characterized by their compact, space-saving design. An electronics box containing the closed-loop control board is mounted in the converter door. This box also has space to hold additional boards for process-related expansion functions and serial interfaces. This design makes them especially easy to service since individual components are easily accessible.

External signals (binary inputs/output), analog inputs/outputs, pulse encoders, etc.) are connected by way of plug-in terminals. The converter software is stored in a flash EPROM. Software upgrades can easily be loaded via the serial interface of the basic unit.

Power section: Armature and field circuit

The armature circuit is a three-phase bridge connection:

As a fully controlled B6C three-phase connection in converters for single-quadrant drives

As two fully controlled (B6) A (B6) C three-phase connections in converters for four-quadrant drives.

The field circuit is a half-controlled B2HZ single-phase bridge connection.

For converters with 15 to 1200 A

rated DC current, the power section for armature and field is constructed with isolated thyristor modules. The heat sink is therefore at floating potential.

For converters with rated currents ≥ 1500 A, the power section for armature and field is constructed with disc-type thyristors and heat sinks at voltage potential. All connecting terminals for the power section are accessible from the front.

Software structure

Two powerful microprocessors (C163 and C167) perform all closed-loop and drive control functions for the armature and field circuits. Closed-loop control functions are implemented in the software as program modules that are “wired up” via parameters.


All important quantities in the closed-loop control system can be accessed via connectors. They correspond to measuring points and can be accessed as digital values. 14 bits (16,384 steps) correspond to 100 % in the standard normalization. These values can be used for other purposes in the converters, e.g. to control a setpoint or change a limit. They can also be output via the operator panel, analog outputs and serial interfaces.

The following quantities are available via connectors:

Analog inputs and outputs

Inputs of actual-value sensing circuit

Inputs and outputs of ramp-function generator, limitations, gating unit, controllers, freely available software modules

Digital fixed setpoints

General quantities such as operating status, motor temperature, thyristor temperature, alarm memory, fault memory, operating hours meter, processor capacity utilization


Binectors are digital control signals which can assume a value of “0” or “1”. They are employed, for example, to inject a setpoint or execute a control function. Binectors can also be output via the operator panel, binary outputs or via serial interfaces.

The following states can be accessed via binectors:

Status of binary inputs

Fixed control bits

Status of controllers, limitations, faults, ramp-function generator, control words, status words.

Intervention points

The inputs of software modules are defined at intervention points using the associated parameters. At the intervention point for connector signals, the connector number of the desired signal is entered in the relevant parameter so as to define which signal must act as the input quantity. It is therefore possible to use both analog inputs and signals from interfaces as well as internal variables to specify setpoints, additional setpoints, limitations, etc.

The number of the binector to act as the input quantity is entered at the intervention point for binector signals. A control function can therefore be executed or a control bit output by means of either binary inputs, control bits of the serial interfaces or control bits generated in the closed-loop control.

Switchover of parameter sets

Four copies of parameters with numbers ranging from P100 to P599 as well as some others are stored in the memory. Binectors can be used to select the active parameter set. This function allows, for example, up to four different motors to be operated alternately or four different gear changes to be implemented on one converter. The setting values for the following functions can be switched over:

  • Definition of motor and pulse encoder
  • Optimization of closed-loop control
  • Current and torque
  • limitation
  • Conditioning of speed controller actual value
  • Speed controller
  • Closed-loop field current control
  • Closed-loop e.m.f. control
  • Ramp-function generator
  • Speed limitation
  • Monitors and limit values
  • Digital setpoints
  • Technology controller
  • Motorized potentiometer
  • Friction compensation
  • Flywheel effect compensation
  • Speed controller adaptation.

Switchover of BICO data sets

The BICO data set can be switched over by the control word (binector input). It is possible to select which connector or binector quantity must be applied at the intervention point. The control structure or control quantities can therefore be flexibly adapted.

Motorized potentiometer

The motorized potentiometer features control functions “Raise”, “Lower”, “Clockwise/Counterclockwise” and “Manual/Auto” and has its own ramp-function generator with mutually independent ramp time settings and a selectable rounding factor. The setting range (minimum and maximum output quantities) can be set by means of parameters. Control functions are specified via binectors.

In Automatic mode (“Auto” setting), the motorized potentiometer input is determined by a freely selectable quantity (connector number). It is possible to select whether the ramping times are effective or whether the output is switched directly through to the output.

In the “Manual” setting, the setpoint is adjusted with the “Raise setpoint” and “Lower setpoint” functions. It is also possible to define whether the output must be set to zero or the last value stored in the event of a power failure. The output quantity is freely available at a connector, e.g. for use at a main setpoint, additional setpoint or limitation.

Mode of operation
Optimization run

6RA70 converters are supplied with parameters set to the factory settings. Automatic optimization runs can be selected by means of special key numbers to support setting of the controllers.

The following controller functions can be set in an automatic optimization run:

  • Current controller optimization run for setting current controllers and feedforward controls (armature and field circuit).
  • Speed controller optimization run for setting characteristic data for the speed controller.
  • Automatic recording of friction and moment of inertia compensation for feedforward control of speed controller.
  • Automatic recording of the field characteristic for an e.m.f.-dependent closed-loop field-weakening control and automatic optimization of the e.m.f. controller in field-weakening operation.

Furthermore, all parameters set automatically during optimization runs can be altered afterwards on the operator panel.

Monitoring and diagnosis

Display of operational data

The operating status of the converter is displayed via parameter r000. Approximately 50 parameters are provided for displaying measured values. An additional 300 signals from the closed-loop control can be selected in the software (connectors) for output on the display unit. Examples of displayable measured values: Setpoints, actual values, status of binary inputs/outputs, line voltage, line frequency, firing angle, inputs/outputs of analog terminals, input/output of controllers, display of limitations.

Trace function

The trace function can be selected to store up to 8 measured quantities with 128 measuring points each. A measured quantity or the activation of a fault message can be parameterized as a trigger condition. It is possible to record the pre-event and post-event history by programming a trigger delay.

The sampling time for the measured value memory can be parameterized to between 3 and 300 ms.

Measured values can be output via the operator panels or serial interfaces.

Fault messages

A number is allocated to each fault message. The time at which the event occurred is also stored with the fault message. This allows the cause of the fault to be pinpointed promptly. The most recent eight fault messages are stored with fault number, fault value and hours count for diagnostic purposes.

When a fault occurs

  • The binary output function “Fault” is set to LOW (selectable function),
  • The drive is switched off (controller disable and current I = 0, pulse disable, relay “Line contactor CLOSED” drops out) and
  • An “F” with a fault number appears on the display, the “Fault” LED lights up.
  • Fault messages can be acknowledged on the operator panel, via a binary assignable-function terminal or a serial interface. When a fault has been acknowledged, the system switches to the “Starting lockout” status. “Starting lockout” is cancelled by OFF (L signal at terminal 37).

Automatic restart: The system can be restarted automatically within a parameterizable time period of 0 to 2s. If this time is set to zero, a fault message is activated immediately (on power failure) without a restart. Automatic restart can be parameterized in connection with the following fault messages: Phase failure (field or armature), undervoltage, overvoltage, failure of electronics power supply, undervoltage on parallel SIMOREG unit.

  • Fault/error messages are divided into the following categories:
  • Line fault: Phase failure, fault in field circuit, undervoltage, overvoltage, line frequency
  • < 45 or > 65 Hz
  • Interface fault: Basic unit interfaces to supplementary boards are malfunctioning
  • Drive fault: Monitor for speed controller, current controller, e.m.f. controller, field current controller has responded, drive blocked, no armature current
  • Electronic motor overload protection (I2t monitor for motor) has responded)
  • Tacho-generator monitor and overspeed signal
  • Start-up error
  • Fault on electronics board
  • Fault message from thyristor check: This fault message will only occur if the thyristor check is activated via the appropriate parameter. The check function ascertains whether the thyristors are capable of blocking and firing
  • Fault messages from motor sensors (with terminal expansion option): Monitoring of brush length, bearing condition, air flow, motor temperature has responded
  • External faults via binary assignable-function terminals.

Fault messages can be deactivated individually. The default setting for some fault messages is “deactivated” so they need to be activated in the appropriate parameter.


Special states that do not lead to drive shutdown are indicated by alarms. Alarms do not need to be acknowledged, but are automatically reset when the cause of the problem has been eliminated.

When one or several alarms occur

  • The binary output function “Alarm” is set to LOW (selectable function) and
  • The alarm is indicated by a flashing “Fault” LED.
  • Alarms are divided into the following categories:
  • Motor overtemperature: The
  • calculated I2t value of the
  • motor has reached 100 %
  • Alarms from motor sensors (with terminal expansion option only): Monitoring of bearing condition, motor fan, motor temperature has responded
  • Drive alarms: Drive blocked, no armature current
  • External alarms via binary assignable-function terminals
  • Alarms from supplementary boards.
Safety shutdown (E-STOP)

The task of the E-STOP function is to open the relay contacts (terminals 109/110) for energizing the main contactor within about 15 ms, independently of semiconductor components and the functional status of the microprocessor board (basic electronics). If the basic electronics are operating correctly, the closed-loop control outputs an I = 0 command to de-energize the main contactor. When an E-STOP command is given, the drive coasts to a standstill.

The E-STOP function can be triggered by one of the following methods:

  • Switch operation: E-STOP is activated when the switch between terminals 105 and 106 opens.
  • Pushbutton operation: Opening an NC contact between terminals 106 and 107 triggers the E-STOP function and stores the shutdown operation. Closing an NO contact between terminals 106 and 108 resets the function.

When the E-STOP function is reset, the drive switches to the “Starting lockout” state. This status needs to be acknowledged through activation of the “Shutdown” function, e.g. by opening terminal 37.

Note: The E-STOP function is not an

EMERGENCY STOP function according to

EN 60204-1.

Serial interfaces

The following serial interfaces are available:

  • One serial interface on connector X300 on the PMU for a USS protocol to the RS 232 or RS 485 standard. For connection of optional OP1S operator panel or for PC-based DriveMonitor.
  • One serial interface at terminals of the basic electronics board, two-wire or four-wire RS485 for USS protocol or peer-to-peer connection.
  • One serial interface at terminals of the terminal expansion board (option), two-wire or four-wire RS485 for USS protocol or peer-to-peer connection.
  • PROFIBUS-DP on a supplementary card (option).
  • SIMOLINK® on a supplementary card (optional) with fiber-optic connection.

Physical characteristics of interfaces

RS 232: ±12 V interface for point-to-point operation.

RS 485: 5 V normal mode interface, noise-proof, for an additional bus connection with a maximum of 31 bus nodes.

USS protocol

Disclosed SIEMENS protocol, easy to program on external systems, e.g. on a PC, any master interfaces can be used. The drives operate as slaves on a master. The drives are selected via a slave number.

The following data can be exchanged via the USS protocol:

PKW data for writing and reading parameters.

PZD data (process data) such as control words, setpoints, status words, actual values.

Connector numbers are entered in parameters to select the transmit data (actual values), the receive data (setpoints) represent connector numbers that can be programmed to act at any intervention points.

Peer-to-peer protocol

The peer-to-peer protocol is used to link one converter to another. With this mode, data are exchanged between converters, e.g. to build a setpoint cascade, via a serial interface. Since a serial interface is employed as a four-wire line, it is possible to receive data from the upstream converter, condition them (e.g. through multiplicative weighting) and then send them to the downstream converter. Only one serial interface is used for the whole operation.

The following data can be exchanged between converters:

  • Transmission of control words and actual values.
  • Receipt of status words and setpoints.

Up to five data words are transmitted in each direction. Data are exchanged on the basis of connector numbers and intervention points.

The serial interfaces can be operated simultaneously. For example, the first interface can be used as an automation link (USS protocol) for open-loop control, diagnostics and specification of the master setpoint. A second interface operates in conjunction with the peer-to-peer protocol to act as a setpoint cascade.



Closed-loop functions in armature circuit

Speed setpoint

The source for the speed setpoint and additional setpoints can be freely selected through parameter settings, i.e. the setpoint source can be programmed as:

  • Analog values
  • 0 to ±10 V, 0 to ±20 mA,
  • 4 to 20 mA
  • Integrated motorized potentiometer
  • Binectors with functions: Fixed setpoint, inch, crawl
  • Serial interfaces on basic unit
  • Supplementary boards

The normalization is such that 100 % setpoint (product of main setpoint and additional setpoints) corresponds to the maximum motor speed.

The speed setpoint can be limited to a minimum or maximum value by means of a parameter setting or connector. Furthermore, “adding points” are included in the software to allow, for example, additional setpoints to be injected before or after the ramp-function generator. The “setpoint enable” function can be selected with a binector. After smoothing by a parameterizable filter (PT1 element), the total setpoint is transferred to the setpoint input of the speed controller. The ramp-function generator is effective at the same time.


6RA7095-4KS22-0 6RA7093-4KS22-0 6RA7091-6DS22-0
6RA7095-4GV62-0 6RA7086-6KV62-0 6RA7091-6DS22-0
6RA7095-4GS22-0 6RA7087-6DS22-0 6RA7090-6GV62-0
6RA7095-4DV62-0 6RA7093-4GS22-0 6RA7090-6GS22-0
6RA7094-6DV62-0 6RA7093-4DV62-0 6RA7088-6LV62-0
6RA7093-4LV62-0 6RA7093-4DS22-0 6RA7088-6LS22-0
6RA7093-4LS22-0 6RA7091-6FV62-0 6RA7088-6KS22-0
6RA7093-4KV62-0 6RA7091-6FS22-0 6RA7086-6KS22-0
6RA7093-4KV62-0 6RA7091-6FS22-0 6RA7087-6GV62-0
6RA7093-4KS22-0 6RA7087-6GS22-0 6RA7087-6FV62-0