Code ISD-022: Premature switching req (ISD%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Premature switching req (ISD%d) alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Cause: This warning is posted when the inactive meter could not finish reloading before the active meter reaches the Pre-Near-Empty position. This is where the sub-meter should start adjusting the pressure value for meter switching. This condition is usually caused by one or more of the following: z The supply pressure was not high enough. z The Pre-Near-Empty location is set too early. z The PLC did not send RELOAD_OK early enough. Remedy: z Make sure the material supply pressure is high enough. z Make sure Pre-Near-Empty location is set properly. z Make sure PLC sends RELOAD_OK on time.
Source: FANUC Robot R-30iA Alarm Code List Operator's Manual
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc R-30i Series Robot Controller Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code ISD-022 on the R-30i Series Robot Controller identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 6553 Fanuc R-30i Series Robot Controller codes.
Have a better solution?
Help the industrial community by sharing your repair experience for code ISD-022.
Need a searchable reference for more Fanuc R-30i Series Robot Controller manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026