Extracting SIMOREG 6RA7093-4KV62 Parameters in Drive Monitor

Overview: SIMOREG 6RA7093-4KV62-0-Z Parameter Recovery in Drive Monitor

The SIMOREG DC-MASTER 6RA70 series is a fully digital thyristor power converter used for the armature and field supply of DC motors. The model code 6RA7093-4KV62-0-Z identifies a specific configuration of this family:

• 6RA7093 – 3-phase armature supply, 930 A rated DC current class (the "93" suffix designates the 930 A frame within the 6RA70 family)
• 4 – Field supply: 4-quadrant operation (both directions of torque and speed)
• KV62 – Hardware variant (control board / firmware option set)
• 0 – Standard firmware version baseline
• Z – Order designation marker (conformal coating / export variant)

Field engineers frequently need to recover or replicate the parameter set of a working 6RA7093 unit when commissioning a replacement drive, migrating to a new motor, or restoring a unit that has lost non-volatile parameter memory. Siemens provides the Drive Monitor PC tool for this purpose, with parameters exchanged in its native text-based Drive Monitor format (file extension .dnx or .txt depending on firmware generation).

Because the SIMOREG 6RA70 stores all tuning data, motor nameplate data, encoder scaling, and closed-loop coefficients in parameter memory, a parameter mismatch between drives almost always causes F030 (field current too low), F031 (field current too high), F034 (electronic overload trip), or simply poor speed/current regulation. The remainder of this document walks through the correct Drive Monitor workflow.

Drive Monitor Tool Requirements and Communication Setup

Drive Monitor is the official Siemens commissioning software for the SIMOREG 6RA70 family. It connects to the drive via serial point-to-point using the RS485 port on the PMU (Parameterizing and Monitoring Unit) or via the optional CBP2 PROFIBUS / CBD2 DeviceNet / CBC CAN communication boards with an RS232-to-RS485 converter on the host side.

Required Components

• Drive Monitor installation media (current revision supporting the 6RA70 firmware in use – typically DriveES SIMOREG or the standalone Drive Monitor from the SIMOREG Compendium CD)
• PC with a free RS232 (COM) port or USB-to-RS232 adapter (FTDI-based adapters are recommended for stable timing)
• Siemens serial cable (6SX7005-0AB00 or equivalent 9-pin straight-through RS485 cable) for the PMU port
• Appropriate parameter documentation for the firmware revision (see the SIMOREG Compendium manual)

Communication Parameters (Default)

For a standard Drive Monitor upload, leave the drive address at 1 and use 19200 baud / 8 data bits / even parity.

Understanding Parameter Numbering in the 6RA70

The SIMOREG 6RA70 organizes parameters into functional groups. Knowing the grouping is essential when you only have a partial parameter set, because motor and feedback scaling parameters sit in a different group than speed-controller tuning parameters.

Parameter Group Map

Extracting Parameters from a Working 6RA7093-4KV62-0-Z

Follow this sequence to capture a complete working parameter set from a known-good drive. Always record parameters from the actual drive the user intends to clone – parameters from a different MLFB or motor pairing will not transfer correctly because motor nameplate, current rating, and field characteristics differ.

Step 1 – Establish Serial Communication

1. Connect the RS485 cable between the PMU X500 (or X501 if used) and the PC COM port.
2. Power the drive electronics (auxiliary 24 V or main supply). The PMU should display a value or "--- 0.0" standby.
3. Open Drive Monitor, choose Online > Drive Connection, and select Serial/USS with baud rate = P781 value and drive address = P780 value.
4. Click Connect. The status bar in Drive Monitor should display ONLINE with the drive order number (e.g., 6RA7093-4KV62) visible in the header bar.

Step 2 – Capture the Full Parameter List

1. From the Drive Monitor menu, select Drive > Upload All Parameters to PC (or press F5 in some revisions). This uploads every indexed parameter, indexed from P000 through the highest parameter in the installed firmware.
2. Save the upload to a Drive Monitor format file (typically .dnx or comma-delimited .txt). Suggested filename convention: 6RA7093-4KV62_FWx.x_SNxxxxx_yyyymmdd.dnx capturing firmware revision, factory serial, and date.
3. Drive Monitor will report a number-of-parameters upload count. If the upload stops early, the communication parameters do not match – verify P780/P781/P782 against the Drive Monitor port settings.

Step 3 – Capture the Fault and Warning Memory

1. Open Diagnosis > Fault Memory and save the contents. The 6RA70 stores the last eight faults and warnings in a non-volatile buffer.
2. Save the current state of binary inputs/outputs (BICO) using Drive > Upload Free Block Configuration if your application uses free interconnection blocks.

P051 = 21: Factory Reset Procedure

If the unit has no usable parameter backup, restore the drive to Siemens factory defaults using parameter P051:

1. Bring the drive to a safe, de-energized state. The line contactor should be open and the armature current at zero. The factory reset does not require main power, only the electronics supply.
2. Set P051 = 21 from the PMU keypad or via Drive Monitor online. P051 is a confirmation parameter; setting it triggers the reset on the next power-up or on the next parameter save action.
3. Confirm by setting P052 = 1 (write parameters to EEPROM, latch to non-volatile memory). Without this step, the factory reset is not retained after power-off.
4. Cycle the electronics supply (24 V or auxiliary fan supply OFF → ON).
5. On reboot the drive will display factory default values. Confirm by reading P051 again – it should return to 0 (idle).

Uploading the Captured Parameter Set to a Replacement 6RA70

1. Connect Drive Monitor to the replacement drive and verify it is online.
2. Select Drive > Download All Parameters from PC (or File > Send to Drive depending on revision). The download writes parameter values one at a time to the drive's RAM.
3. After the download completes, set P052 = 1 to commit the parameter set to EEPROM. Failure to commit causes the drive to revert to the previous parameter set at the next power cycle.
4. Cycle control power and verify the parameters have been retained by reading back P050, P100, P200, and P300 group values.

Key Parameters to Verify After Download

After a parameter download from a donor unit, validate the following critical parameters against the actual motor nameplate and the wiring of the recipient drive. Do not assume they are correct just because the file transferred without error.

Common Parameter-Related Fault Codes

When a parameter download is incomplete or mismatched, the 6RA7093 reports one of the following faults. Use the table to map symptoms to the parameter group that needs review.

For the complete fault list and recovery procedure, refer to the SIMOREG DC-MASTER Compendium (C98130-A1256 series) available from Siemens Industry Online Support.

Drive Monitor File Format Reference

The Drive Monitor parameter file is a plain ASCII text file. Each line represents one parameter and follows the structure:

P100 = 400.0  ; Rated armature voltage (V)
P101 = 720.0  ; Rated armature current (A)
P102 = 15.5   ; Rated field current (A)
P051 = 0      ; Reset / confirmation parameter (idle)
P052 = 1      ; Save parameters to EEPROM

Key formatting rules for a valid Drive Monitor file:

• Parameter index (P###) must be exactly four characters including the P.
• The equals sign must be surrounded by single spaces.
• The numeric value uses a period as decimal separator; no thousands separator.
• A trailing comment starts with a semicolon and is ignored on download.
• Index parameters (those with subindices, e.g., connector selection) use square brackets, for example P600[1] = 0.

Working with Multi-Parameter Sets

The SIMOREG 6RA70 supports multiple parameter sets in some firmware revisions. Use the following to manage them:

• P056 = 0..3 – Select active parameter set (0 = factory, 1..3 = user sets).
• P057 – Copy active set to a target set.
• P058 – Copy parameter set to/from optional operator panel (OP1S) memory.

Optimization After Parameter Download

A downloaded parameter set provides a starting point but must be re-optimized for the recipient drive's motor and mechanical load. The standard optimization sequence on the 6RA70 is:

1. Current controller optimization – Triggered by setting P051 = 25. The drive applies a current step and measures armature resistance and inductance to set P155 / P156 automatically. The motor must be uncoupled or free to rotate without load for this to succeed; for a coupled motor, the optimization will report partial results and the integrator component (P156) must be entered manually.
2. Speed controller optimization – Triggered by setting P051 = 26. The drive runs a pre-defined speed profile and sets P200 (Kp) and P201 (Tn) for the closed-loop speed controller.
3. Field weakening optimization – Triggered by setting P051 = 27. The drive maps the field characteristic for operation above base speed. Only run this with the motor uncoupled if the load cannot tolerate field reduction.
4. EMF controller optimization – Triggered by setting P051 = 28. Optimizes the EMF controller for flux control.

Each optimization can take 30–90 seconds. If any optimization reports a fault (typically F030, F031, or F042), abort and investigate motor wiring and feedback hardware before retrying. The optimization procedure is detailed in the SIMOREG DC-MASTER Compendium manual C98130-A1256.

Parameter Backup Verification Checklist

Before relying on a captured parameter file, validate it using this checklist:

• ✓ File opens cleanly in Drive Monitor without "invalid index" warnings.
• ✓ P800 (drive MLFB) matches the source drive: 6RA7093-4KV62-0-Z.
• ✓ P820 (software version) is recorded in the file header or comments.
• ✓ All P150–P156 current controller values are present (not zero, not default 0/0).
• ✓ P200 / P201 speed controller values are present.
• ✓ P300–P340 field-related values are present.
• ✓ The parameter count reported by Drive Monitor on upload matches the count in the file (Drive Monitor displays this in the status bar after upload).

Troubleshooting Matrix: Parameter and Drive Monitor Issues

Safety and Operational Notes

Working with the SIMOREG 6RA7093 requires attention to lethal voltages – the DC bus on a 930 A unit can reach 800 V DC and the line-side three-phase AC is present at the power terminals whenever the line contactor is closed. Always:

• Lock out / tag out the main disconnect and verify zero energy with a properly rated meter before opening the cabinet.
• Wait at least 5 minutes after power removal for the bus capacitors to self-discharge below 50 V DC before touching any power section components.
• Parameter edits with the line contactor closed will become active immediately; the motor can start if a run command is present. Always disable the run command before downloading parameters.
• P051 = 21 (factory reset) does not require main power but does require that the drive is in a stopped state. If the drive is in run, the parameter is rejected.

FAQ