70001

Access Diagnostics menu: Siemens HMI > Diagnosis > Axis Data > select Yf axis. Verify current position against displayed limit values (C1 and Cy). Note the actual traverse range being attempted.

Do not jog beyond current position limits during this check.

In NCK parameters, navigate to MD32100 (C1 lower limit) and MD32110 (Cy upper limit) for the Yf axis. Compare configured values against mechanical drawing specifications and encoder calibration documentation. Calculate C1-Cy span and verify it matches machine capability.

If limits are incorrect, update MD32100 and MD32110 with correct values. Save parameters using 'Store to NVRAM' function in machine data editor. Perform warm restart (NC RESET) to activate changes.

Verify new parameters with machine builder before restart to prevent mechanical damage.

After restart, perform slow JOG movements in both directions near limits to confirm alarm no longer triggers. Monitor position display in real-time diagnostics.

Access NCK > Actual Values menu and note the displayed Yf position. Physically move the Yf axis to a known reference point (e.g., machine home position or mechanical hard stop) using manual handwheel if available.

Use low speed manual movement to avoid exceeding limits.

Check if the NCK position display matches the physical reference location. If offset exists, access MD25600 (encoder offset for Yf axis) or use the 'Set to Zero' function from Diagnostics > Axis Data menu to recalibrate the position reference.

If offset correction is made, perform NC RESET and verify encoder signals are being received correctly in NCK > Diagnosis > Drive > Encoder Status for the Yf axis servo drive.

Attempt JOG movement in both directions in small increments to confirm position accuracy and that alarm 70001 no longer triggers.

Stop all JOG operations immediately. Access NCK > Diagnosis > Drive menu and check the servo drive status for the Yf axis. Look for active faults, encoder error messages (ERR_ENC), or current limiting indicators in the SIMODRIVE 611 control panel.

High servo current or temperature warnings indicate drive malfunction—do not resume operation.

Verify encoder cable integrity by checking Diagnostics > Serial Interfaces or Encoder Status. If using SSI or CANopen encoder feedback, confirm the encoder is communicating (blink LEDs on encoder connector if visible). Test cable continuity if accessible.

Check servo tuning parameters: MD33050 (P gain), MD33051 (I gain), and MD33080 (following error threshold) for the Yf axis. Compare against factory defaults or commissioning documentation. Excessive P gain can cause instability.

If drive faults exist, perform a cold restart: Power cycle the machine control, then attempt a single slow JOG pulse. If alarm 70001 recurs immediately, contact Siemens field service for servo drive replacement or recalibration.