6SN1123-1AB00-0CA3 & 6SN1118-1NK01-0AA1 Siemens SIMODRIVE 611 Power & Control Module Set

6SN1123-1AB00-0CA3 and 6SN1118-1NK01-0AA1 belong to Siemens SIMODRIVE 611 digital servo drive system, consisting of a 2-axis power module and a 2-axis closed-loop control board. This matched set is widely used with SINUMERIK 810D/840D CNC systems for machine tool feed axis and spindle precision motion control. The power module supplies power to servo motors, while the control board executes position, speed and torque closed-loop calculation, realizing high-precision axis synchronization for milling, turning and machining centers.

6SN1123-1AB00-0CA3 is a two-axis LT power module with internal heat dissipation. It works with 600V DC bus, rated total current 50A, supporting feed motor 18A and spindle motor 24A output. It converts DC bus voltage into three-phase variable frequency AC power to drive 1FT6,1FK6 series synchronous servo motors. Integrated hardware protection includes overcurrent, overvoltage, over-temperature, short circuit and motor overload protection, which cuts off output immediately once faults occur to protect motors and drive components. The compact rack-mounted design fits standard SIMODRIVE 611 cabinet slots, IP20 protection grade for cabinet installation.

6SN1118-1NK01-0AA1 is a 2-axis digital closed-loop control unit designed for resolver feedback. It receives CNC setpoint signals and resolver actual position feedback signals, runs high-speed closed-loop control algorithm to adjust motor speed and position. It supports speed, torque and position control modes, with expandable option slots for extra functions. It communicates with CNC NCU via dedicated drive bus, ensuring fast and deterministic motion data transmission. This control card is the core command unit of the servo system, responsible for axis interpolation, error monitoring and alarm signal output.

Both modules are discontinued legacy CNC spare parts. A large quantity of old CNC machine tools still rely on SIMODRIVE 611 drive packages. If either power module or control board fails, replacing with the identical matched set can reuse original servo motors, resolver cables, bus wiring and CNC parameter files. No modification to machine mechanical structure or NC program is required. Technicians can directly restore original axis parameters, which greatly reduces maintenance cost and shortens machine downtime. Operators keep the original machining performance without re-tuning axis gain.

We supply fully tested 6SN1123-1AB00-0CA3 and 6SN1118-1NK01-0AA1 spare modules. Before shipment, we perform complete functional inspection: power-on startup test, bus communication verification, resolver feedback signal test, motor loading test and protection function simulation. We verify matching performance of power module and control board to ensure stable combined operation. All products carry 12-month warranty. Our automation technical team provides remote support for rack assembly, parameter backup, wiring check and fault diagnosis. Fast global shipping is available for urgent CNC maintenance orders.

For CNC maintenance engineers and machine tool integrators, this SIMODRIVE 611 power and control module set is a reliable spare solution. It retains original high-precision machining performance of legacy CNC equipment, extends service life of machine assets and avoids expensive full drive system retrofitting.