Code 4620: Invalid handwheel module for handwheel %1
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Invalid handwheel module for handwheel %1 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
Parameters: %1 = Handwheel module Definitions: For SINUMERIK 802D only: The handwheel module for handwheel %1 requested through MD11351 $MN_HANDWHEEL_MODULE is not available for 802D systems. An 802D system is always regarded as a module. Therefore MD11351 $MN_HA NDWHEEL_MODULE = 1 must always be set for handwheels linked direct ly to 802D systems. Reaction: Interface signals are set. Alarm display. Remedy: Set machine date MD11351 $MN_HANDWHEEL_MODULE = 1 for the corresponding handwheel. Program Continuation: Switch control OFF - ON.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 4620 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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