We Repair Industrial Electronics
Servo Drives & VFD's
Celtex Electric & Automation provides bench-level repair and testing of variable frequency drives, servo drives, and associated power electronics — offering a faster and more cost-effective alternative to replacement, particularly for discontinued or long-lead hardware.
Comprehensive Repair Services
Servo Drive Restoration
Our skilled technicians provide expert repair services for servo drives, ensuring precise control and enhanced performance for your machinery.
VFD Repair Solutions
We offer specialized repair solutions for Variable Frequency Drives, optimizing energy efficiency and operational stability.
Motion Controller Maintenance
Maintain peak performance with our comprehensive motion controller repair and maintenance services, tailored to your specific needs.
Legacy Equipment Support
Extend the lifespan of your legacy industrial equipment with our dedicated support and repair services, minimizing downtime and costs.
Our Repair Philosophy.
Real Diagnostics. Component Level Repairs.
Equipment failures are not random events. Capacitors age, IGBT modules fail from sustained overcurrent or inadequate gate drive, DC bus voltage sensing circuits drift, and thermal management systems degrade silently over years of operation. A repair that doesn’t address root cause puts refurbished hardware back into service with the same failure mode waiting to repeat.
Celtex approaches drive repair the way a controls engineer would — tracing circuits, testing individual components, cross-referencing replacement parts against original specifications, and verifying operation under load before return to service.
We repair what we can diagnose, and we’re direct about what we can’t.
Key Features of Our Repair Services
Capacitor Testing & Replacement
ESR and capacitance measurement of electrolytic bus capacitors — the most common age-related failure mode in VFDs. Full bank replacement with matched or upgraded capacitors and pre-charge circuit verification.
Cost Efficient Repairs
A new servo or frequency drive can run ten of thousands of dollars. We can repair equipment and return it to service at a fraction of the cost with less lead time than your OEM.
Gate Driver & Control PCB Repair
Fault tracing on gate driver PCBs — bootstrap circuits, isolated gate resistors, optocoupler signal paths, and fault latch circuits. Component-level repair where board-level faults are locatable and correctable.
Power Supply & SMPS Diagnosis
Internal switched-mode power supply diagnosis and repair — covering control card rails, fan supply, and operator interface power. Output voltage verification across all drive operating states.
Voltage Sensing Circuit Repair
DC bus voltage sensing circuit tracing through analog switches, op-amp networks, and processor interfaces. Calibration verification and restoration of accurate voltage feedback for proper drive protection operation.
Load Testing & Verification
Bench load testing following repair — verifying output voltage balance, current regulation, switching waveform quality, and fault response under representative load conditions before the unit returns to service.
Equipment We Repair
Product Lines We Work With
VFD’s: General
ABB ACS series, WEG CFW series, Yaskawa A1000 / V1000, Siemens SINAMICS G series, Danfoss VLT — capacitor banks, IGBT modules, and control board repair across medium and large frame sizes.
Servo Drives
Parker SLVD / SLVD7 / Compax3, Mitsubishi MR-J2 / MR-J3 / MR-J4, Yaskawa SGDA / SGDM / Sigma-5, Allen-Bradley Kinetix — DC bus, gate driver, and encoder feedback circuit repair.
Large Frame VFD’s
500HP and above — WEG CFW09, ABB ACS880, Siemens SINAMICS S120 — parallel IGBT module configurations, DC bus capacitor banks, and pre-charge circuit diagnosis.
Soft Starters
SCR-based soft starter diagnosis — thyristor testing, firing board fault tracing, snubber circuit inspection, and bypass contactor verification.
DC Drives
Legacy DC drive repair — SCR bridge testing, armature and field supply diagnosis, speed feedback circuit repair, and regenerative braking circuit evaluation.
Power Electronics PCB’s
Gate driver boards, control cards, operator interface boards, and encoder feedback modules — component-level fault tracing, rework, and functional verification.
The Repair Process
Intake & Fault History Review
We start with building context — fault codes, operating history, any known events before failure, and whether the failure was sudden or gradual. This narrows the diagnostic starting point and avoids missing a root cause that isn’t obvious on the bench.
Visual Inspection & Preliminary Testing
Physical inspection for burnt traces & components, swollen capacitors, cracked solder joints, and failed resistors. Static IGBT and diode testing, fuse and pre-charge circuit checks, and control power verification before any power is applied to the unit.
Component Level Diagnosis
ESR testing of electrolytic capacitors, gate driver signal tracing, voltage sensing circuit analysis, and power supply output verification. We identify failed components and assess whether secondary damage has occurred downstream of the primary fault.
Repair Estimate & Approval
A written scope of repair is provided before any work proceeds — identifying the fault, the proposed repair, parts required, and an honest assessment of whether repair is cost-justified versus replacement. No surprises on the invoice.
Repair & Bench Testing
Component replacement, board rework, and reassembly — followed by bench testing under load. Output waveform quality, current balance across phases, fault response, and parameter restoration are all verified before the unit ships.
Documentation & Return
A repair & diagnostic report is issued with each unit — detailing faults found, components replaced, test results, and any recommendations for the installation environment that may have contributed to the failure.
We'll Tell You When Repair Isn't The Right Call
Not every item that comes to the bench is worth repairing.
If your equipment is damaged beyond economical repair, or if the failure mode suggests the hardware will repeat the same fault — we’ll say so plainly and help you find the better path.
Our goal is your equipment running reliably, not a repair invoice for its own sake.