Servo alarms are stressful because they stop the whole axis — but a large share of "dead servo drive" calls turn out to be wiring, noise or mechanical problems, not the drive itself. Before you order a replacement, run through the seven checks below. If the drive is genuinely failed, we will get you back online with a compatible replacement kit.
| Alarm | Typical cause | Quick check |
|---|---|---|
| Overcurrent (OC) | Motor cable damage, phase short, sudden mechanical jam | Disconnect motor, run drive unloaded — if alarm clears, check motor and mechanics |
| Overvoltage (OV) | Decelerating high-inertia load without regen resistor; supply spike | Verify braking resistor is connected and measures correct resistance |
| Encoder error | Encoder cable damaged, shield broken, connector contaminated | Reseat connectors; inspect cable along the drag chain; measure shield continuity |
| Overload (OL) | Mechanical binding, wrong gain settings, undersized drive | Rotate the mechanism by hand (power off) — it should move freely |
| Position deviation | Gains too low/high, load inertia changed, coupling slip | Check coupling screws and re-run auto-tuning after any mechanical change |
| Regenerative alarm | Missing or failed braking resistor for vertical axes | Confirm resistor installed for Z-axis and hoisting applications |
| Communication loss | Ethernet/pulse train cable, EMI from nearby VFDs, grounding | Separate signal cables from power cables; verify shield grounding at one end |
Generic Servo Drive Kit Compatible with Mitsubishi MR-J4 / MR-JE
Generic Servo Drive Kit Compatible with Delta ASDA-B2 / A2
Generic Servo Drive Kit Compatible with Siemens 6SL3210-5FE (V90) / 1FL6
Generic Servo Drive Kit Compatible with Yaskawa SGD7S / SGM7
Generic Servo Drive Kit Compatible with Schneider LXM28 / LXM32
Generic Servo Drive Kit Compatible with INVT DA180 / TS seriesEvery kit ships tested with drive + matching accessories, conformal-coated electronics and 50/60 Hz universal power. Send your nameplate photos to sales@inverterplc.com or WhatsApp +86 157 0595 3332 for a same-day fit confirmation.
As a rule of thumb: if the repair quote exceeds roughly 40% of a replacement unit's price, replacement wins — especially for older platforms where used parts availability is poor. A compatible replacement also removes the risk of repeat failures from age-worn components.
Our servo drive kits are engineered as direct-fit alternatives for mainstream platforms including Mitsubishi MR-J4/MR-JE, Delta ASDA-B2/A2, Siemens V90 and Yaskawa SGD7S. Motor and encoder interface matching is confirmed against your nameplate before we quote — always send the exact model.
A photo of the drive nameplate, the motor nameplate, and the alarm code the drive displays (if any). With those three items we can confirm the matching replacement, stock and dispatch time within one working day.
