What the Er.410 alarm means

DC bus voltage fell below the lower threshold; the drive drops the axis rather than run with insufficient torque. We are very familiar with this alarm on INOVANCE IRCB500 / IRCB501 + SV660 servo systems — usually the first on-site inspection is enough to confirm the cause.

Most common causes

  • Supply voltage low or a momentary dip
  • Blown input fuse or open phase
  • Loose main terminals
  • Inrush circuit damaged by frequent cycling
Field note: Our ticket data shows the first cause is by far the most common — start there to avoid dead ends.

Step-by-step field fix

  1. Measure supply voltage under load
  2. Check all three input phases and fuses
  3. Tighten main-circuit terminals; look for heat marks
  4. Reduce power cycling frequency
  5. If supply is clean, suspect the drive inrush circuit
Safety first: For INOVANCE er-410, 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 Measure supply voltage under load; the DC bus and power stage handling is not a DIY job. On INOVANCE er-410: 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

INOVANCE er-410 belongs to the drive & power stage family. On INOVANCE er-410 the failing stage is Inovance servos (SV660N class), same family as the robot controller on the Inovance robot controllers (IRCB series and kin) - the fault sits on the energy chain: mains input, rectification, DC bus, braking resistor, inverter power devices and the drive board. We start reading INOVANCE er-410 at the pendant alarm screen (ER.xxx / 0x9xxx segments) and the servo panel Er code.

The chain involved in INOVANCE er-410 runs: three-phase mains -> rectifier -> DC bus (bus capacitors) -> brake chopper / braking resistor -> inverter (IGBT) -> motor.

When INOVANCE er-410 fires, the site usually reports Supply voltage low or a momentary dip first, but the real cause is often cooling: More than half of power-stage alarms are not a dead device but a device cooked by failed cooling. A stopped cabinet fan, a packed filter mat or a dusted air duct keeps IGBT junction temperature high: intermittent over-temperature first, hard fault days later. On these alarms we open the power module and look for cracked thermal paste and felted dust in the duct, then measure phase-to-phase output and insulation to frame. Swapping the module without cleaning the duct just buys the same failure again.

Field notes on this page cover INOVANCE er-410 (Main Circuit Undervoltage); written by the Henghuan repair team, updated 2026-10-01.

Still unresolved? Our engineers are standing by

Tell us the alarm code, the model and what the machine was doing when the alarm appeared. INOVANCE er-410 INOVANCE er-410 is an everyday diagnosis for our engineers, and remote diagnosis (phone or video) costs nothing.

Get a Free Remote Diagnosis See Repair Services

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

Related Drive & Power Stage alarms

Er.201 — Hardware Overcurrent Er.210 — Motor Overload Er.400 — Main Circuit Overvoltage Er.610 — Drive Overload (I2t) Er.920 — Regenerative Overload
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 EFORT · JAKA · AUBO and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the INOVANCE er-410 alarm mean?

DC bus voltage fell below the lower threshold; the drive drops the axis rather than run with insufficient torque. We are very familiar with this alarm on INOVANCE IRCB500 / IRCB501 + SV660 servo systems — usually the first on-site inspection is enough to confirm the cause. INOVANCE er-410 sits in the drive & power stage family; on our work orders the highest-frequency trigger for this code is "Supply voltage low or a momentary dip".

QCan I clear a INOVANCE er-410 alarm myself?

Whether INOVANCE er-410 clears on its own depends on the outcome of "Measure supply voltage under load". Finish the flow with "If supply is clean, suspect the drive inrush circuit" to confirm INOVANCE er-410 - do not skip it. If that step is clean, the second most frequent cause on INOVANCE er-410 is "Blown input fuse or open phase". After clearing INOVANCE er-410, 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 INOVANCE er-410, what spares do you bring on site?

The commonest causes we see on INOVANCE er-410 are "Supply voltage low or a momentary dip, Blown input fuse or open phase, Loose main terminals", so we stock the van against those. For INOVANCE er-410 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 INOVANCE er-410, drive alarms usually stop the whole line, so they sit at the front of our dispatch queue. Before we roll, tell us what INOVANCE er-410 shows on the pendant alarm screen (ER.xxx / 0x9xxx segments) and the servo panel Er code and what the machine was doing - phone or video triage is free.

The notes on INOVANCE er-410 were summarized by the Henghuan Robotics repair team from on-site service. The alarm interpretation is our empirical summary for troubleshooting reference and may vary by controller and software version — please check INOVANCE documentation or contact us with questions. Henghuan is an independent service provider, not affiliated with or endorsed by INOVANCE.