Code 25021: Axis %1 zero mark moni toring of passive encoder

Parameters: %1 = Axis name, spindle number Definitions: Monitoring relates to the encoder that is not used by the position control. (NC-PLC interface signal DB31,... DBX1.5 = 0 (Position measuring system 1) or DB31,... DBX1.6 = 0 (Position measuring system 2)) More detailed explanations are si milar to those for alarm 25020. Reaction: Alarm display. Remedy: Please inform the authorized personne l/service department. The differences can result from transmission errors, disturbances, encoder hardware faults or from the ev aluation electronics in the encoder not used for position control. The actual value branch must therefore be checked: 1. Transmission path: Check the ac tual-value connectors for corr ect contacting, encoder cable for continuity, and also check for shor t-circuits and groundi ng (loose contact?). 2. Encoder pulses: Is the encoder power supply within the tolerance limits? 3. Evaluation electronics: Replace or rec onfigure the drive or encoder module used. Monitoring can be switched off by setting MD3 6310 $MA_ENC_ZERO_MONITORING[n] to 0 or 100 (n = encoder number: 1, 2). Program Continuation: Clear alarm with the Delete key or NC START.