What the 1010 alarm means

DC bus voltage exceeded the upper limit; regenerated energy or high supply voltage pushed the bus past the protection threshold. In our EFORT service archive this alarm on EC2-S controller + TSINO drives systems shows up constantly, and the first on-site inspection almost always locates it.

Most common causes

  • Braking resistor open or disconnected
  • Deceleration too aggressive for the inertia
  • Incoming AC supply above rating
  • Regenerative capacity parameter mismatched to the resistor
Field note: The first cause is the most common in the field — check it first, then work through the rest.

Step-by-step field fix

  1. Check the braking resistor and wiring first — an open resistor is the usual cause
  2. Measure incoming supply voltage
  3. Soften deceleration ramps
  4. Match the regenerative parameter to the installed resistor
  5. Verify the fix by running the failing move at reduced speed
Safety first: For EFORT 1010, this alarm family involves the DC bus, which sits at several hundred volts and stays charged for minutes after power-off - touching terminals is a shock hazard. What you can check yourself first is Check the braking resistor and wiring first — an open resistor is the usual cause; the DC bus and power stage handling is not a DIY job. On EFORT 1010: checking incoming voltage at the disconnect and looking at breakers and fuses is fine to do yourself; opening the cabinet to touch bus terminals or pulling power modules needs a qualified electrician.

How we diagnose drive alarms on site

EFORT 1010 belongs to the drive & power stage family. On EFORT 1010 the failing stage is matched servo drives assigned per axis in the cabinet on the EFORT robot controller - the fault sits on the energy chain: mains input, rectification, DC bus, braking resistor, inverter power devices and the drive board. We start reading EFORT 1010 at the pendant alarm list (four-digit codes, 1xxx / 3xxx / 4xxx segments).

The chain involved in EFORT 1010 runs: three-phase mains -> rectifier -> DC bus (bus capacitors) -> brake chopper / braking resistor -> inverter (IGBT) -> motor.

Braking resistor open or disconnected is common on EFORT 1010, but look at the duty cycle: Cells with high-inertia loads or frequent start-stop cycles return far more regenerative energy than a plain transfer cell, and the braking resistor lives in a hot cycle that shortens its life. When we suspect this family we ask what changed: if the takt was raised recently or a heavier fixture went on, the alarm cluster usually lines up with that process change. Replacing the resistor alone will not fix it - the chopper rating and resistor wattage have to be re-checked against the new duty.

Field notes on this page cover EFORT 1010 (Drive DC Bus Overvoltage (TSINO)); written by the Henghuan repair team, updated 2026-10-01.

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Related Drive & Power Stage alarms

1001 — Drive Overcurrent (TSINO Servo) 1011 — Drive DC Bus Undervoltage (TSINO) 1020 — Motor Overload (TSINO)
Same family: this code belongs to the Drive & power stage alarms family - the page collects all Drive & power stage-family codes we have handled, with the common inspection order and spares.
Other brands: we also keep field-fix libraries for JAKA · AUBO · ROKAE and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the EFORT 1010 alarm mean?

DC bus voltage exceeded the upper limit; regenerated energy or high supply voltage pushed the bus past the protection threshold. In our EFORT service archive this alarm on EC2-S controller + TSINO drives systems shows up constantly, and the first on-site inspection almost always locates it. EFORT 1010 sits in the drive & power stage family; on our work orders the highest-frequency trigger for this code is "Braking resistor open or disconnected".

QCan I clear a EFORT 1010 alarm myself?

Whether EFORT 1010 clears on its own depends on the outcome of "Check the braking resistor and wiring first — an open resistor is the usual cause". Finish the flow with "Verify the fix by running the failing move at reduced speed" to confirm EFORT 1010 - do not skip it. If that step is clean, the second most frequent cause on EFORT 1010 is "Deceleration too aggressive for the inertia". If EFORT 1010 returns after two clears, or the checks point at Braking resistor open or disconnected, stop the cell and call a professional robot repair engineer.

QFor drive/power alarms like EFORT 1010, what spares do you bring on site?

The commonest causes we see on EFORT 1010 are "Braking resistor open or disconnected, Deceleration too aggressive for the inertia, Incoming AC supply above rating", so we stock the van against those. For EFORT 1010 specifically, we stock the van along the energy chain: braking resistors, bus capacitors, input fuses, drive-board supply parts and the common power modules for the brand. For EFORT 1010, drive alarms usually stop the whole line, so they sit at the front of our dispatch queue. Before we roll, tell us what EFORT 1010 shows on the pendant alarm list (four-digit codes, 1xxx / 3xxx / 4xxx segments) and what the machine was doing - phone or video triage is free.

This page on EFORT 1010 was written by the Henghuan Robotics repair team from field service experience. Alarm descriptions are our own summary for troubleshooting reference and may vary by controller and software version — when in doubt, check your EFORT documentation or contact us. Henghuan is an independent service provider, not affiliated with or endorsed by EFORT.