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Siemens 6RA70 DCC DC Drive Repair with Complete Functional Testing – Case Study

“Siemens 6RA70 DC Drive repair and testing in Pune”

Siemens 6RA70 DCC DC Drive Repair with Complete Functional Testing – Case Study

Posted at 08:36h in DC Drive Repair by

Introduction

Baiza Automation recently completed the repair of a Siemens 6RA70 DCC DC Drive, followed by full functional performance testing before dispatch. This DC drive was received with armature and field-related faults causing machine stoppage in a heavy industrial application.

Industrial DC drives like the 6RA70 series are widely used in rolling mills, cranes, extrusion lines, and wire drawing machines where precise speed control is critical.

Reported Issues in the Siemens 6RA70 Drive

The customer reported:

  • Frequent drive tripping

  • Armature overcurrent fault

  • Field failure alarm

  • Unstable motor speed

  • Occasional power section failure

These are common issues in **Siemens 6RA70 DC drives when power components or firing circuits degrade over time.

Repair & Diagnostic Process

Our engineering team performed:

1️⃣ Detailed Fault Diagnosis

  • SCR / Thyristor module testing

  • Armature & field circuit inspection

  • Control PCB signal verification

2️⃣ Component-Level Repair

  • Thyristor module correction

  • Firing card repair

  • Capacitor health check

  • Feedback signal testing

3️⃣ Functional Bench Testing

The drive was tested under controlled conditions to verify:

  • Stable DC output

  • Proper firing angle control

  • Armature & field voltage stability

  • Fault-free continuous operation

(Testing video attached for customer validation.)

Siemens DC Drive Models We Support

We provide repair services for:

  • 6RA70 Series (6RA7018, 6RA7025, 6RA7031, 6RA7075, 6RA7087, 6RA7090)

  • 6RA23 / 6RA24 / 6RA26 / 6RA27 / 6RA28 Series

  • SIMOREG DC MASTER Series

Why Repair Instead of Replacement?

Replacing a DC drive can be costly and time-consuming.
Professional repair offers:

✔ Lower cost
✔ Faster turnaround
✔ Reduced downtime
✔ Extended equipment life

Service Coverage

We provide Siemens DC drive repair services across:

Pune, Chakan MIDC, Bhosari MIDC, Ranjangaon MIDC, Talegaon MIDC & Pimpri-Chinchwad.

Conclusion

If your Siemens DC drive is showing armature faults, field alarms, or frequent tripping, professional diagnosis and component-level repair can restore performance and reduce downtime.

📞 Contact Baiza Automation for reliable Siemens 6RA70 DC Drive repair support.