Code ARC-136: Cannot pulse t1=%d > t2=%d
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Cannot pulse t1=%d > t2=%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: Low Frequency Pulse Welding cannot continue because the delay to communicate between the robot and the welder (t1) is longer than the pulse command update cycle time (t2). This may occur with Low Frequency Pulse Welding. Remedy: Normally, this appears just before ARC-133. If ARC-133 is also posted just after this alarm, there is no need to remedy. Please resume the program. If ARC-133 is not posted just after this alarm, please contact to your local FANUC representative.
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 ARC-136 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.
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