Code SEAL-023: Air on/off too late: Sch %d
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Air on/off too late: Sch %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: In the Schedule number listed, the Atomizing Air signal has been set up to turn on or off too long after the node the SS[] or SE is attached to. Currently, if this signal is set up to turn on or off greater than 100ms after the node, this warning will be posted and the signal will fire 100ms after the node. These are the formulas used to determine when this signal will be turned on or off relative to the node for seal schedule 'n': For SS[n]: Time_Before = ATOMIZING_ON_DELAY + EQUIPMENT_DELAY - GUNON_DELAY For SE[n]: Time_Before = ATOMIZING_OFF_DELAY + EQUIPMENT_DELAY - GUNOFF_DELAY Note that a NEGATIVE Time_Before means AFTER the node. Remedy: There is no real danger in this condition. You should be aware that if you try to turn this signal on or off after 100ms AFTER the node, the signal will always be fired 100ms after the node and this warning will be posted. To correct this problem, make the atomizing_on/off/_delay or equipment_delay more positive or the gunon/gunoff delay more negative, to move the firing of the signal up earlier.
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 SEAL-023 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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