Rapid Automation Sales And Services

Lenze AC Drives Repairing Service offers expert diagnosis and repair of Lenze variable frequency drives (VFDs) used to control motor speed and torque in industrial applications.⚡ AC VFD Repairing & Service (Industrial)

An AC Variable Frequency Drive (VFD) controls the speed and torque of AC motors by varying frequency and voltage. It’s widely used in pumps, conveyors, compressors, HVAC systems, and CNC machines.

�� What is VFD Repairing?

VFD repairing includes:

• Fault diagnosis
• Power & control section repair
• Replacement of damaged components
• Testing under load conditions

Goal: restore drive performance and avoid production downtime

⚠️ Common VFD Faults

Typical issues you’ll encounter in the field:

• ❌ Drive not powering ON
• ❌ Overvoltage / undervoltage trip
• ❌ Overcurrent / short circuit fault
• ❌ IGBT module failure
• ❌ Capacitor bulging or failure
• ❌ Cooling fan not working (overheating)
• ❌ Control PCB fault
• ❌ Communication errors (Modbus/Profibus)
• ❌ Motor not running / speed fluctuation

��️ VFD Repair Process (Professional Approach)1. Initial Inspection

• Check input supply (R-Y-B voltage)
• Visual inspection (burn marks, smell, dust)
• Check fault codes on display

2. Power Section Testing

• Rectifier (diode bridge) test
• DC bus voltage check
• IGBT module testing
• Capacitor health check

3. Control Section Testing

• PCB inspection
• Gate driver signals
• Feedback & control signals

4. Repair / Replacement

• Replace IGBT / capacitors / fan
• Repair or replace control board
• Tighten terminals & wiring

5. Cleaning & Preventive Maintenance

• Blow dust with air
• Clean heat sinks
• Check cooling system

6. Testing & Commissioning

• No-load testing
• Motor trial run
• Parameter setting & tuning

 

�� Services You Can Offer / Get

• ✔ On-site VFD troubleshooting
• ✔ Emergency breakdown service
• ✔ Panel inspection & wiring correction
• ✔ Parameter backup & restoration
• ✔ Retrofitting & upgrading
• ✔ AMC (Annual Maintenance Contract)

�� Practical Engineer Tips

• �� Always discharge DC bus capacitors before working
• �� Check DC bus voltage (~300–600V DC) carefully
• �� Replace cooling fans periodically (major failure cause)
• �� Keep proper earthing & shielding to avoid noise faults
• �� Use correct motor cable (VFD grade)

⚙️ Basic VFD Working Formula

��=120����N=P120f​

Where:

• N = Motor speed (RPM)
• f = Frequency (Hz)
• P = Number of poles

➡️ This is how VFD controls motor speed by changing frequency.

�� Need More Help?

We can help you with:

• �� VFD troubleshooting checklist (site use)
• �� Service report format (professional)
• �� Nearby VFD repair service
• �� Step-by-step fault finding for your specific model

Just tell me ��

⚡ DC Drive Repairing & Service (Industrial)

DC Drive is an electronic controller used to control the speed, torque, and direction of DC motors by regulating voltage and current. It is widely used in industrial machines like rolling mills, printing machines, cranes, and conveyors.

🔧 What is DC Drive Repairing?

DC drive repairing is the process of:

• Fault diagnosis
• Component-level repair
• Replacement of damaged parts
• Testing & calibration

The goal is to restore the drive to proper working condition and avoid costly replacement.

⚠️ Common DC Drive Faults

Typical problems you may face:

• ❌ Drive not powering ON
• ❌ Motor not running / low speed
• ❌ Overcurrent / overload trip
• ❌ Thyristor failure or rectifier damage
• ❌ PCB damage or loose wiring
• ❌ Feedback (encoder/tacho) issues
• ❌ Memory or parameter errors

🛠️ DC Drive Repair Process (Step-by-Step)1. Fault Diagnosis

• Check input power (AC supply)
• Inspect control signals and wiring
• Identify fault codes or alarms

2. Component Testing

• Thyristors / SCR testing
• IGBT / diode check
• PCB inspection

3. Repair / Replacement

• Replace faulty components
• Repair tracks and connectors
• Update or reload parameters

4. Cleaning & Maintenance

• Remove dust, carbon, oil
• Check cooling fans & heat sinks

5. Testing & Calibration

• Load testing
• Speed & current calibration
• Trial run with motor

➡️ Professional services use test benches to simulate real working conditions before delivery.

🏭 Brands Commonly Serviced

• Siemens (Simoreg)
• ABB (DCS series)
• Parker / Eurotherm 590
• Lenze
• Control Techniques (Mentor)
• Mitsubishi / Yaskawa

🧰 Services Included

• ✔ On-site troubleshooting
• ✔ Panel inspection & wiring check
• ✔ Drive repair (analog & digital)
• ✔ Refurbishment / reconditioning
• ✔ AMC (Annual Maintenance Contract)
• ✔ Emergency breakdown service

💡 Why Repair Instead of Replace?

• 💰 Cost saving (up to 50–70%)
• ⏱ Faster turnaround
• 🔄 Extend machine life
• ⚙️ Keep compatibility with old systems

🧠 Practical Tips (Engineer Level)

• Always check armature voltage & field supply first
• Keep spare fuses, SCR modules, control cards
• Avoid running drive with faulty cooling (major cause of failure)
• Use proper earthing to prevent PCB damage

🚀 If You Need Service

I can help you with:

• 📍 Nearby DC drive repair service (in your area)
• 📄 Service quotation format
• 🧾 Checklist for site visit
• 🧰 Troubleshooting guide for specific drive model

Just tell me 👍

Drive Type	AC Drive
Drive Brand	Fuji
Drive Power	all KW
Input Voltage	380-415 V
Application Industry	ANYWHERE
Service Mode	In House
Service Location	All India
Emergency Service	Available
Pickup Facility	Courier Only

Fuji AC Drive Repairing Service 
⚡ AC VFD Repairing & Service (Industrial)

An AC Variable Frequency Drive (VFD) controls the speed and torque of AC motors by varying frequency and voltage. It’s widely used in pumps, conveyors, compressors, HVAC systems, and CNC machines.

�� What is VFD Repairing?

VFD repairing includes:

• Fault diagnosis
• Power & control section repair
• Replacement of damaged components
• Testing under load conditions

Goal: restore drive performance and avoid production downtime

⚠️ Common VFD Faults

Typical issues you’ll encounter in the field:

• ❌ Drive not powering ON
• ❌ Overvoltage / undervoltage trip
• ❌ Overcurrent / short circuit fault
• ❌ IGBT module failure
• ❌ Capacitor bulging or failure
• ❌ Cooling fan not working (overheating)
• ❌ Control PCB fault
• ❌ Communication errors (Modbus/Profibus)
• ❌ Motor not running / speed fluctuation

��️ VFD Repair Process (Professional Approach)1. Initial Inspection

• Check input supply (R-Y-B voltage)
• Visual inspection (burn marks, smell, dust)
• Check fault codes on display

2. Power Section Testing

• Rectifier (diode bridge) test
• DC bus voltage check
• IGBT module testing
• Capacitor health check

3. Control Section Testing

• PCB inspection
• Gate driver signals
• Feedback & control signals

4. Repair / Replacement

• Replace IGBT / capacitors / fan
• Repair or replace control board
• Tighten terminals & wiring

5. Cleaning & Preventive Maintenance

• Blow dust with air
• Clean heat sinks
• Check cooling system

6. Testing & Commissioning

• No-load testing
• Motor trial run
• Parameter setting & tuning

 

�� Services You Can Offer / Get

• ✔ On-site VFD troubleshooting
• ✔ Emergency breakdown service
• ✔ Panel inspection & wiring correction
• ✔ Parameter backup & restoration
• ✔ Retrofitting & upgrading
• ✔ AMC (Annual Maintenance Contract)

�� Practical Engineer Tips

• �� Always discharge DC bus capacitors before working
• �� Check DC bus voltage (~300–600V DC) carefully
• �� Replace cooling fans periodically (major failure cause)
• �� Keep proper earthing & shielding to avoid noise faults
• �� Use correct motor cable (VFD grade)

⚙️ Basic VFD Working Formula

��=120����N=P120f​

Where:

• N = Motor speed (RPM)
• f = Frequency (Hz)
• P = Number of poles

➡️ This is how VFD controls motor speed by changing frequency.

�� Need More Help?

We can help you with:

• �� VFD troubleshooting checklist (site use)
• �� Service report format (professional)
• �� Nearby VFD repair service
• �� Step-by-step fault finding for your specific model

 

Just tell me ��

⚡ AC VFD Repairing & Service (Industrial)

An AC Variable Frequency Drive (VFD) controls the speed and torque of AC motors by varying frequency and voltage. It’s widely used in pumps, conveyors, compressors, HVAC systems, and CNC machines.

�� What is VFD Repairing?

VFD repairing includes:

• Fault diagnosis
• Power & control section repair
• Replacement of damaged components
• Testing under load conditions

Goal: restore drive performance and avoid production downtime

⚠️ Common VFD Faults

Typical issues you’ll encounter in the field:

• ❌ Drive not powering ON
• ❌ Overvoltage / undervoltage trip
• ❌ Overcurrent / short circuit fault
• ❌ IGBT module failure
• ❌ Capacitor bulging or failure
• ❌ Cooling fan not working (overheating)
• ❌ Control PCB fault
• ❌ Communication errors (Modbus/Profibus)
• ❌ Motor not running / speed fluctuation

��️ VFD Repair Process (Professional Approach)1. Initial Inspection

• Check input supply (R-Y-B voltage)
• Visual inspection (burn marks, smell, dust)
• Check fault codes on display

2. Power Section Testing

• Rectifier (diode bridge) test
• DC bus voltage check
• IGBT module testing
• Capacitor health check

3. Control Section Testing

• PCB inspection
• Gate driver signals
• Feedback & control signals

4. Repair / Replacement

• Replace IGBT / capacitors / fan
• Repair or replace control board
• Tighten terminals & wiring

5. Cleaning & Preventive Maintenance

• Blow dust with air
• Clean heat sinks
• Check cooling system

6. Testing & Commissioning

• No-load testing
• Motor trial run
• Parameter setting & tuning

�� Common VFD Brands Serviced

• Danfoss

�� Services You Can Offer / Get

• ✔ On-site VFD troubleshooting
• ✔ Emergency breakdown service
• ✔ Panel inspection & wiring correction
• ✔ Parameter backup & restoration
• ✔ Retrofitting & upgrading
• ✔ AMC (Annual Maintenance Contract)

�� Practical Engineer Tips

• �� Always discharge DC bus capacitors before working
• �� Check DC bus voltage (~300–600V DC) carefully
• �� Replace cooling fans periodically (major failure cause)
• �� Keep proper earthing & shielding to avoid noise faults
• �� Use correct motor cable (VFD grade)

⚙️ Basic VFD Working Formula

��=120����N=P120f​

Where:

• N = Motor speed (RPM)
• f = Frequency (Hz)
• P = Number of poles

➡️ This is how VFD controls motor speed by changing frequency.

�� Need More Help?

We can help you with:

• �� VFD troubleshooting checklist (site use)
• �� Service report format (professional)
• �� Nearby VFD repair service
• �� Step-by-step fault finding for your specific model

Just tell me ��

Siemens AC Drive Repairing Service
⚡ AC VFD Repairing & Service (Industrial)

An AC Variable Frequency Drive (VFD) controls the speed and torque of AC motors by varying frequency and voltage. It’s widely used in pumps, conveyors, compressors, HVAC systems, and CNC machines.

�� What is VFD Repairing?

VFD repairing includes:

• Fault diagnosis
• Power & control section repair
• Replacement of damaged components
• Testing under load conditions

Goal: restore drive performance and avoid production downtime

⚠️ Common VFD Faults

Typical issues you’ll encounter in the field:

• ❌ Drive not powering ON
• ❌ Overvoltage / undervoltage trip
• ❌ Overcurrent / short circuit fault
• ❌ IGBT module failure
• ❌ Capacitor bulging or failure
• ❌ Cooling fan not working (overheating)
• ❌ Control PCB fault
• ❌ Communication errors (Modbus/Profibus)
• ❌ Motor not running / speed fluctuation

��️ VFD Repair Process (Professional Approach)1. Initial Inspection

• Check input supply (R-Y-B voltage)
• Visual inspection (burn marks, smell, dust)
• Check fault codes on display

2. Power Section Testing

• Rectifier (diode bridge) test
• DC bus voltage check
• IGBT module testing
• Capacitor health check

3. Control Section Testing

• PCB inspection
• Gate driver signals
• Feedback & control signals

4. Repair / Replacement

• Replace IGBT / capacitors / fan
• Repair or replace control board
• Tighten terminals & wiring

5. Cleaning & Preventive Maintenance

• Blow dust with air
• Clean heat sinks
• Check cooling system

6. Testing & Commissioning

• No-load testing
• Motor trial run
• Parameter setting & tuning

 

�� Services You Can Offer / Get

• ✔ On-site VFD troubleshooting
• ✔ Emergency breakdown service
• ✔ Panel inspection & wiring correction
• ✔ Parameter backup & restoration
• ✔ Retrofitting & upgrading
• ✔ AMC (Annual Maintenance Contract)

�� Practical Engineer Tips

• �� Always discharge DC bus capacitors before working
• �� Check DC bus voltage (~300–600V DC) carefully
• �� Replace cooling fans periodically (major failure cause)
• �� Keep proper earthing & shielding to avoid noise faults
• �� Use correct motor cable (VFD grade)

⚙️ Basic VFD Working Formula

��=120����N=P120f​

Where:

• N = Motor speed (RPM)
• f = Frequency (Hz)
• P = Number of poles

➡️ This is how VFD controls motor speed by changing frequency.

�� Need More Help?

We can help you with:

• �� VFD troubleshooting checklist (site use)
• �� Service report format (professional)
• �� Nearby VFD repair service
• �� Step-by-step fault finding for your specific model

Just tell me ��

Schneider AC Drive Repairing Service 
⚡ AC VFD Repairing & Service (Industrial)

An AC Variable Frequency Drive (VFD) controls the speed and torque of AC motors by varying frequency and voltage. It’s widely used in pumps, conveyors, compressors, HVAC systems, and CNC machines.

�� What is VFD Repairing?

VFD repairing includes:

• Fault diagnosis
• Power & control section repair
• Replacement of damaged components
• Testing under load conditions

Goal: restore drive performance and avoid production downtime

⚠️ Common VFD Faults

Typical issues you’ll encounter in the field:

• ❌ Drive not powering ON
• ❌ Overvoltage / undervoltage trip
• ❌ Overcurrent / short circuit fault
• ❌ IGBT module failure
• ❌ Capacitor bulging or failure
• ❌ Cooling fan not working (overheating)
• ❌ Control PCB fault
• ❌ Communication errors (Modbus/Profibus)
• ❌ Motor not running / speed fluctuation

��️ VFD Repair Process (Professional Approach)1. Initial Inspection

• Check input supply (R-Y-B voltage)
• Visual inspection (burn marks, smell, dust)
• Check fault codes on display

2. Power Section Testing

• Rectifier (diode bridge) test
• DC bus voltage check
• IGBT module testing
• Capacitor health check

3. Control Section Testing

• PCB inspection
• Gate driver signals
• Feedback & control signals

4. Repair / Replacement

• Replace IGBT / capacitors / fan
• Repair or replace control board
• Tighten terminals & wiring

5. Cleaning & Preventive Maintenance

• Blow dust with air
• Clean heat sinks
• Check cooling system

6. Testing & Commissioning

• No-load testing
• Motor trial run
• Parameter setting & tuning

 

�� Services You Can Offer / Get

• ✔ On-site VFD troubleshooting
• ✔ Emergency breakdown service
• ✔ Panel inspection & wiring correction
• ✔ Parameter backup & restoration
• ✔ Retrofitting & upgrading
• ✔ AMC (Annual Maintenance Contract)

�� Practical Engineer Tips

• �� Always discharge DC bus capacitors before working
• �� Check DC bus voltage (~300–600V DC) carefully
• �� Replace cooling fans periodically (major failure cause)
• �� Keep proper earthing & shielding to avoid noise faults
• �� Use correct motor cable (VFD grade)

⚙️ Basic VFD Working Formula

��=120����N=P120f​

Where:

• N = Motor speed (RPM)
• f = Frequency (Hz)
• P = Number of poles

➡️ This is how VFD controls motor speed by changing frequency.

�� Need More Help?

We can help you with:

• �� VFD troubleshooting checklist (site use)
• �� Service report format (professional)
• �� Nearby VFD repair service
• �� Step-by-step fault finding for your specific model

Just tell me ��

Allen Bradley AC Drive  Repairing And Service
⚡ AC VFD Repairing & Service (Industrial)

An AC Variable Frequency Drive (VFD) controls the speed and torque of AC motors by varying frequency and voltage. It’s widely used in pumps, conveyors, compressors, HVAC systems, and CNC machines.

�� What is VFD Repairing?

VFD repairing includes:

• Fault diagnosis
• Power & control section repair
• Replacement of damaged components
• Testing under load conditions

Goal: restore drive performance and avoid production downtime

⚠️ Common VFD Faults

Typical issues you’ll encounter in the field:

• ❌ Drive not powering ON
• ❌ Overvoltage / undervoltage trip
• ❌ Overcurrent / short circuit fault
• ❌ IGBT module failure
• ❌ Capacitor bulging or failure
• ❌ Cooling fan not working (overheating)
• ❌ Control PCB fault
• ❌ Communication errors (Modbus/Profibus)
• ❌ Motor not running / speed fluctuation

��️ VFD Repair Process (Professional Approach)1. Initial Inspection

• Check input supply (R-Y-B voltage)
• Visual inspection (burn marks, smell, dust)
• Check fault codes on display

2. Power Section Testing

• Rectifier (diode bridge) test
• DC bus voltage check
• IGBT module testing
• Capacitor health check

3. Control Section Testing

• PCB inspection
• Gate driver signals
• Feedback & control signals

4. Repair / Replacement

• Replace IGBT / capacitors / fan
• Repair or replace control board
• Tighten terminals & wiring

5. Cleaning & Preventive Maintenance

• Blow dust with air
• Clean heat sinks
• Check cooling system

6. Testing & Commissioning

• No-load testing
• Motor trial run
• Parameter setting & tuning

 

�� Services You Can Offer / Get

• ✔ On-site VFD troubleshooting
• ✔ Emergency breakdown service
• ✔ Panel inspection & wiring correction
• ✔ Parameter backup & restoration
• ✔ Retrofitting & upgrading
• ✔ AMC (Annual Maintenance Contract)

�� Practical Engineer Tips

• �� Always discharge DC bus capacitors before working
• �� Check DC bus voltage (~300–600V DC) carefully
• �� Replace cooling fans periodically (major failure cause)
• �� Keep proper earthing & shielding to avoid noise faults
• �� Use correct motor cable (VFD grade)

⚙️ Basic VFD Working Formula

��=120����N=P120f​

Where:

• N = Motor speed (RPM)
• f = Frequency (Hz)
• P = Number of poles

➡️ This is how VFD controls motor speed by changing frequency.

�� Need More Help?

We can help you with:

• �� VFD troubleshooting checklist (site use)
• �� Service report format (professional)
• �� Nearby VFD repair service
• �� Step-by-step fault finding for your specific model

Just tell me ��

⚡ AC VFD Repairing & Service (Industrial)

An AC Variable Frequency Drive (VFD) controls the speed and torque of AC motors by varying frequency and voltage. It’s widely used in pumps, conveyors, compressors, HVAC systems, and CNC machines.

🔧 What is VFD Repairing?

VFD repairing includes:

• Fault diagnosis
• Power & control section repair
• Replacement of damaged components
• Testing under load conditions

Goal: restore drive performance and avoid production downtime

⚠️ Common VFD Faults

Typical issues you’ll encounter in the field:

• ❌ Drive not powering ON
• ❌ Overvoltage / undervoltage trip
• ❌ Overcurrent / short circuit fault
• ❌ IGBT module failure
• ❌ Capacitor bulging or failure
• ❌ Cooling fan not working (overheating)
• ❌ Control PCB fault
• ❌ Communication errors (Modbus/Profibus)
• ❌ Motor not running / speed fluctuation

🛠️ VFD Repair Process (Professional Approach)1. Initial Inspection

• Check input supply (R-Y-B voltage)
• Visual inspection (burn marks, smell, dust)
• Check fault codes on display

2. Power Section Testing

• Rectifier (diode bridge) test
• DC bus voltage check
• IGBT module testing
• Capacitor health check

3. Control Section Testing

• PCB inspection
• Gate driver signals
• Feedback & control signals

4. Repair / Replacement

• Replace IGBT / capacitors / fan
• Repair or replace control board
• Tighten terminals & wiring

5. Cleaning & Preventive Maintenance

• Blow dust with air
• Clean heat sinks
• Check cooling system

6. Testing & Commissioning

• No-load testing
• Motor trial run
• Parameter setting & tuning

🏭 Common VFD Brands Service

• Delta

🧰 Services You Can Offer / Get

• ✔ On-site VFD troubleshooting
• ✔ Emergency breakdown service
• ✔ Panel inspection & wiring correction
• ✔ Parameter backup & restoration
• ✔ Retrofitting & upgrading
• ✔ AMC (Annual Maintenance Contract)

💡 Practical Engineer Tips

• 🔹 Always discharge DC bus capacitors before working
• 🔹 Check DC bus voltage (~300–600V DC) carefully
• 🔹 Replace cooling fans periodically (major failure cause)
• 🔹 Keep proper earthing & shielding to avoid noise faults
• 🔹 Use correct motor cable (VFD grade)

⚙️ Basic VFD Working Formula

𝑁=120𝑓𝑃N=P120f​

Where:

• N = Motor speed (RPM)
• f = Frequency (Hz)
• P = Number of poles

➡️ This is how VFD controls motor speed by changing frequency.

🚀 Need More Help?

I can help you with:

• 📋 VFD troubleshooting checklist (site use)
• 📄 Service report format (professional)
• 📍 Nearby VFD repair service
• 🧰 Step-by-step fault finding for your specific model

Just tell me 👍