What the ArmPowerRefused alarm means
Pressing arm-power-enable does nothing; the controller refuses because the working mode is reported as remote or invalid. Almost always a mode-selection or configuration problem rather than a hard failure. Our engineers run into this alarm every week on Staubli CS8 / CS9 (VAL3) controllers, and a single on-site inspection usually identifies the problem.
Most common causes
- WMS mode selector box damaged or disconnected
- Mode selector contacts worn (no mode LED lights on the pendant)
- Arm.cfx corrupt so the cabinet cannot determine a valid mode
- Working mode cable harness fault
Step-by-step field fix
- Check the mode selector box and its cable — damaged selector connectors are a known wear item
- Verify the mode status LEDs on the pendant light according to the selector position
- Repair or replace the mode selector hardware
- If hardware is healthy, check arm.cfx validity (see NoDriveConfiguration)
- After repair, test arm power enable in local/manual mode first
How we diagnose safety-chain faults on site
Staubli armpowerrefused belongs to the safety chain & e-stop family. On Staubli armpowerrefused the failing stage is safety chain plus functional-safety options (speed and zone monitoring) on the CS8 / CS9 - continuity of one series loop: e-stop buttons, door switches, light curtains, safety relays and the enabling device. We start reading Staubli armpowerrefused at the pendant error list and VAL3 log, with cabinet module indicators.
The chain involved in Staubli armpowerrefused runs: e-stop / door / curtain -> safety relay (dual channel) -> controller safety input -> motor-off and brake apply.
On Staubli armpowerrefused (field clue usually WMS mode selector box damaged or disconnected) we have one hard rule: On this family we have a hard rule: no bypassing the safety loop, no forcing contactors closed, ever. Some sites jumper the door switch to keep running - that removes the entire protection function, and when something happens there is no protective action and no defensible account of responsibility. We have seen a crush injury caused by exactly that jumper, so we would rather wait for parts than do it. If a customer has already jumpered it, we restore the circuit first and then diagnose the real fault.
Field notes on this page cover Staubli armpowerrefused (Arm Power Enable Request Refused); written by the Henghuan repair team, updated 2026-10-01.
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Related Safety Chain & E-Stop alarms
EStopChain — Emergency Stop Circuit Open — Power Cannot EnableFrequently asked questions
QWhat does the Staubli armpowerrefused alarm mean?
Pressing arm-power-enable does nothing; the controller refuses because the working mode is reported as remote or invalid. Almost always a mode-selection or configuration problem rather than a hard failure. Our engineers run into this alarm every week on Staubli CS8 / CS9 (VAL3) controllers, and a single on-site inspection usually identifies the problem. Staubli armpowerrefused sits in the safety chain & e-stop family; on our work orders the highest-frequency trigger for this code is "WMS mode selector box damaged or disconnected".
QCan I clear a Staubli armpowerrefused alarm myself?
Whether Staubli armpowerrefused clears on its own depends on the outcome of "Check the mode selector box and its cable — damaged selector connectors are a known wear item". Finish the flow with "After repair, test arm power enable in local/manual mode first" to confirm Staubli armpowerrefused - do not skip it. If that step is clean, the second most frequent cause on Staubli armpowerrefused is "Mode selector contacts worn (no mode LED lights on the pendant)". After clearing Staubli armpowerrefused, watch it for one shift. A second trip means stop and let an engineer arrive with the right test gear for the e-stop chain and safety circuit.
QA safety-chain fault like Staubli armpowerrefused stops the line - how fast can you be here?
The commonest causes we see on Staubli armpowerrefused are "WMS mode selector box damaged or disconnected, Mode selector contacts worn (no mode LED lights on the pendant), arm.cfx corrupt so the cabinet cannot determine a valid mode", so we stock the van against those. For Staubli armpowerrefused specifically, we stock along the loop: safety relays, common door switches, e-stop buttons, light-curtain pairs and terminal blocks. For Staubli armpowerrefused, a safety-chain fault stops the whole line, so we rank it top priority and pre-triage by phone: door switch, e-stop or relay. Before we roll, tell us what Staubli armpowerrefused shows on the pendant error list and VAL3 log, with cabinet module indicators and what the machine was doing - phone or video triage is free.
This page on Staubli armpowerrefused is based on the field experience of the Henghuan Robotics repair team. Alarm explanations are our own summary for troubleshooting reference and may differ across controller and software versions — if unsure, verify against Staubli documentation or reach out to us. Henghuan is an independent service provider with no affiliation or endorsement by Staubli.