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Code 230017: <location>Power unit: Hardware current limit has responded too often

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>Power unit: Hardware current limit has responded too often 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

Message value: Fault cause: %1 bin Drive object: All objects Reaction: OFF2 Acknowledge: IMMEDIATELY Cause: The hardware current limitation in the relev ant phase (see A30031, A30032, A30033) has responded too often. The number of times the limit has been exceeded depends on the design and type of power unit. For infeed units, the following applies: - closed-loop control is incorrectly parameterized. - load on the infeed is too high. - Voltage Sensing Module incorrectly connected. - commutating reactor missing or the incorrect type. - power unit defective. The following applies to Motor Modules: - closed-loop control is incorrectly parameterized. - fault in the motor or in the power cables. - the power cables exceed the maximum permissible length. - motor load too high - power unit defective. Fault value (r0949, interpret binary): Bit 0: Phase U Bit 1: Phase V Bit 2: Phase W Remedy: For infeed units, the following applies: - check the controller settings, if required, reset and identify the controller (p0340 = 2, p3410 = 5). - reduce the load, if required, increase the DC link capacitance or use a higher-rating infeed. - check the connection of the optional Voltage Sensing Module. - check the connection and technical data of the commutating reactor. - check the power cables for short-circuit or ground fault. - replace power unit. The following applies to Motor Modules: - check the motor data. - check the motor circuit configuration (star-delta). - check the motor load. - check the power cable connections. - check the power cables for short-circuit or ground fault. - check the length of the power cables. - replace power unit.

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 230017 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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