SIMOREG 6RA24 Siemens Variable Speed DC Drive
Description & Standard Features

SIMOREG 6RA24 Siemens DC Drive Description and Standard Features
(Siemens 3rd Generation DC Drive)

SIMOREG Drive Controller

The Siemens Motor Regulator (SIMOREG) is a state of the art, microprocessor based DC drive controller. This drive controller converts a three-phase, 50/60 Hz supply voltage into six pulse adjustable voltage to operate a DC motor. Output armature voltage varies directly with speed reference to provide constant torque operation from zero speed to base speed. Above base speed, the motor shunt field current may be decreased to further increase speed and provide a constant horsepower output up to maximum speed.

The SIMOREG drive controller is designed to provide precise motor speed control over a wide range of machine parameters and load conditions. This software based controller will serve well as a packaged drive or as part of a drive system.

Horsepower ranges include 1-250HP at 230VAC, 2-1750HP at 460VAC input and 1500HP and higher at 600/650V AC input. All HP ratings are available as regenerative or non-regenerative drive controllers. Listed below are standard features, a partial list of adjustments, display parameters, service conditions, diagnostics, and protection features. Consult the Technical Information Section for additional information.

Standard FeaturesThe SIMOREG drive controller includes the following standard features: (Refer to the Technical Information Section for additional details.)

  • Designed to meet the requirements of NEMA, IEEE, NEC, UL Listed and CSA Certified through 510A.
  • 6 Pulse SCR (Silicon Controlled Rectifier) Bridge Microprocessor Control Board with 16 bit 38 Mhz high performance multi- tasking microprocessor
  • User interface keypad and digital display
  • Power and interface control board Individual pulse transformers per SCR
  • R/C snubbers across each SCR
  • Current transformers for current
  • regulator feedback
  • Run/Ready light
  • Plug-in wiring harness between boards
  • Shunt field excitation circuitry with field current loss protection and field economizing circuit
  • Terminal blocks for incoming/outgoing
  • wiring connections
  • Wire markers
  • Fully rated contactor
  • High speed AC power fuses
  • 460/230: 115V AC control power transformer
  • Power supply transformer
  • Digitally fired burst type SCR gate pulses
  • 1400PRV rated thyristors are standard
  • Built-in AID converter accepts external reference sources
  • Digital and analog tachometer generator feedback
  • Serial communication via RS232 or RS485 serial ports
  • General purpose P-I-D loop for additional regulation modes
  • Freely programmable blocks for mathematical functions
  • Software programming package to aid in start up
  • Peer to Peer Link
  • Tachometer to Voltage Feedback switching
  • Four layer parameter
  • 5 Binary and analog outputs


  • Priority access code protection
  • Minimum speed
  • Maximum speed
  • Linear acceleration
  • Linear deceleration
  • S-Curve rounding
  • Jog and thread speed presets
  • Current limit
  • Tapered current limit
  • IR compensation for voltage feedback drives
  • Motor armature current rating
  • Motor field current rating
  • Self turning routine automatically adjusts each SIMOREG drive controller to optimum performance upon command
  • Overspeed with tachometer feedback
  • CEMF crossover voltage (for field weakened speed ranges)

  • Tachometer loss and overspeed
  • Field current loss
  • 12t motor overload
  • Instantaneous overcurrent
  • Line tolerance monitoring
  • Phase sequence monitoring
  • Phase loss
  • dv/dt Protection on the SCR’s
  • SCR type high speed AC line fuses
  • DC output fuse on regenerative units
  • Heat sink thermostat on fan cooled units
  • Isolated electronics

There are more than 120 diagnostic messages for troubleshooting, including fault and warning indication and memory retention of the last four faults. Some of the diagnostics include:

  • Line voltage out of tolerance
  • Line frequency unstable/out of tolerance
  • Phase loss
  • Motor stalled
  • SCR failure detection and identification
  • Loss of speed or voltage feedback
  • Current overload
  • EEPROM/Microprocessor malfunctions
  • Quick Stop
  • 8 Channel data storage

Standard Displays include:

  • Speed reference
  • Operating speed
  • Current reference
  • Actual current
  • Gating angle
  • CEMF
  • Armature voltage
  • CEMF/Speed
  • RMS AC phase to phase voltage
  • All parameter setpoints
  • Torque direction
  • Operating time
  • Field current reference

Service Conditions

  • 0-40°C Ambient
  • Altitude: 3300 feet above sea level without derating (1000 meters)
  • 95% Relative humidity (non-condensing)
  • AC line voltage tolerance + 10%, -5%
  • Frequency tolerance 48 to 62 Hz


Data Subject to Change without Notice