Code 25: SAFE OPERATION SYSTEM ALARM

Type of error: E — NC equipment (system hardware/software error) Stopped status: H — Emergency stop Clearing procedure: N — Eliminate cause -> power off -> power back on Display colour: Red On-screen parameters (shown in parentheses): Alarm No., Axis/Door Cause: There occurred an alarm in the safe operation system. Alarm No. Cause 1 Discrepancy between parameters. The parameters stored in the NC memory for the safe operation system differ from those which are sent to the drive units. 2 Abnormal speed command. In the mode of safety-speed operation a command was given for a speed exceeding the speed limit that is specified in the parameter concerned. 3 Abnormal position feedback. In the mode of safety-speed operation an excessive error was detected between the position of the command given to the servo drive unit and the feedback position received from there. 4 Abnormal speed feedback. In the mode of safety-speed operation the engine speed exceeded the safety limit specified in the parameter concerned. 5 Discrepancy between input signals of door state. A difference was detected between the input signal of the door state on the NC side and that on the drive unit side. Probable causes are as follows: - Break in the cables, - Defect in the door switch, - Defect in the NC or servo drive unit. 6 Abnormal input signal of door open state in the normal mode. Door open state was detected in the normal mode of operation. In addition to the same probable causes as for item 5 above, the user PLC might be defective. 7 Discrepancy between parameters for speed monitoring. During start-up of the mode of safety-speed operation a discrepancy was detected between two parameters concerned. Action: Contact Mazak Technical Center or Technology Center with the information of the first item (Alarm No.) displayed in parentheses.