What the 1001 alarm means

The TSINO servo drive for the affected axis detected output current above the power-stage limit and shut down to protect the IGBT module. This is a routine repair in our workshop for EFORT EC2-S controller + TSINO drives systems, and we normally pin it down during the first site check.

Most common causes

  • Motor power cable shorted phase-to-phase or to ground
  • Motor winding insulation failure
  • Damaged drive power module
  • Oil or coolant inside the motor connector
  • Acceleration far beyond the mechanical capability
Field note: Begin with the first item in the list; it has a far higher on-machine occurrence rate than the others.

Step-by-step field fix

  1. Power off, let the DC bus discharge, then megger the motor phases to ground
  2. Disconnect the motor and power the drive alone — a repeat 1001 means a dead power stage
  3. Dry and clean contaminated connectors
  4. Check the cable for crush points in the dress pack
  5. Replace the failed part and re-test with a slow jog
Safety first: For EFORT 1001, 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. The self-serviceable action is Power off, let the DC bus discharge, then megger the motor phases to ground; anything past that falls under the DC bus and power stage and needs a certified engineer. On EFORT 1001: 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 1001 belongs to the drive & power stage family. On EFORT 1001 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 1001 at the pendant alarm list (four-digit codes, 1xxx / 3xxx / 4xxx segments).

The chain involved in EFORT 1001 runs: three-phase mains -> rectifier -> DC bus (bus capacitors) -> brake chopper / braking resistor -> inverter (IGBT) -> motor.

Motor power cable shorted phase-to-phase or to ground is common on EFORT 1001, 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 1001 (Drive Overcurrent (TSINO Servo)); written by the Henghuan repair team, updated 2026-10-01.

Not sure? Don't force it — contact an engineer

Share the alarm code, machine model and the operating condition at the moment of the alarm. Our engineers are highly experienced with EFORT 1001, and remote diagnosis (phone/video) is completely free.

Get a Free Remote Diagnosis See Repair Services

Hotline: +86-20-39029800 · WhatsApp: +86-188-1886-2860

Related Drive & Power Stage alarms

1010 — Drive DC Bus Overvoltage (TSINO) 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 1001 alarm mean?

The TSINO servo drive for the affected axis detected output current above the power-stage limit and shut down to protect the IGBT module. This is a routine repair in our workshop for EFORT EC2-S controller + TSINO drives systems, and we normally pin it down during the first site check. EFORT 1001 sits in the drive & power stage family; on our work orders the highest-frequency trigger for this code is "Motor power cable shorted phase-to-phase or to ground".

QCan I clear a EFORT 1001 alarm myself?

Whether EFORT 1001 clears on its own depends on the outcome of "Power off, let the DC bus discharge, then megger the motor phases to ground". Finish the flow with "Replace the failed part and re-test with a slow jog" to confirm EFORT 1001 - do not skip it. If that step is clean, the second most frequent cause on EFORT 1001 is "Motor winding insulation failure". After clearing EFORT 1001, watch it for one shift. A second trip means stop and let an engineer arrive with the right test gear for the DC bus and power stage.

QFor drive/power alarms like EFORT 1001, what spares do you bring on site?

The commonest causes we see on EFORT 1001 are "Motor power cable shorted phase-to-phase or to ground, Motor winding insulation failure, Damaged drive power module", so we stock the van against those. For EFORT 1001 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 1001, drive alarms usually stop the whole line, so they sit at the front of our dispatch queue. Before we roll, tell us what EFORT 1001 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.

The content on EFORT 1001 was written by Henghuan Robotics service engineers from hands-on repair experience. Alarm descriptions are our own reference summary and may differ by controller or software version — defer to EFORT documentation, or contact us to confirm. Henghuan is an independent service provider with no affiliation or endorsement by EFORT.