Okuma Alarm-D 4182 MCS APA speed over
The position encoder value (RAPA) changes as the motor rotates.
The NC checks this change with preset frequency.
This alarm occurs if the change per unit time exceeds the allowable range consecutively. For example, an axis feedrate is abnormally high compared with the normal rapid feedrate, or the encoder value changes irregularly due to malfunction of the position encoder.
Axis name or none (spindle)
Absolute value of the change in encoder value per position control frequency [encoder’s 1/65536 turn/position control frequency]
The following codes, however, have specific meanings:
1= Linear axis has exceeded its travel range.
2= Rotary axis has exceeded its travel range (360) or limited axis has negative positional data.
3= Limited axis has exceeded its travel range.
Probable Faulty Locations
– Motor encoder (BL motor)
– Encoder link cables or connectors (BL motor)
– PG or magnetic encoder (VAC motor)
– PG or magnetic encoder cables or connectors (VAC motor)
– Inverter unit control board