3137

Common Causes

• Faulty DD encoder slave sensor
• Gap between sensor and scale too narrow or too wide (codes 42/43)
• Sensor inclination out of tolerance (codes 40/41)
• Communication error with the sensor or master sensor (codes 02/21)
• Initialization speed too high or absolutization failure (codes 04/05/20)

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code XX bit7 = Error bit — 1 indicates an error in the positional data status; code XX bit6 = Absolute position sensor margin error (0 normal, 1 warning); code XX bit5 = Gap warning — 1 gap small, toggling indicates gap too big; code XX bit4 = Inclination warning — 1 CCW big, toggling indicates CW big; code XX bit3 = Auto set mode (0 normal, 1 auto mode); code XX bit2 = Communication error, toggles when detected; code XX bit1,0 = Error bit number of the absolute position code (2 bits); code YY 01 = Stop command has stopped
2. 2Record the full XXYYZZZZ code: XX is the positional data status (bit7 = error, bit6 = margin warning, bit5 = gap warning, bit4 = inclination warning, bit2 = communication error), YY is the alarm code, ZZZZ is fixed 0000.
3. 3Branch on the YY value: 42/43 = gap narrow/wide and 40/41 = inclination error — power off, lock out, and inspect the slave sensor mounting; clean the sensor face and scale and correct the mounting gap and alignment.
4. 4For 02 (communication error) or 21 (master sensor communication error, Format-5 only), check the sensor cable and connectors for damage, looseness or coolant ingress and reseat them.
5. 5For 04/05 (absolutization error / initialization speed too high), retry initialization at a reduced axis speed; for 08 (auto-set-data error) repeat the auto-set procedure.
6. 6For 3E/3F (absolute position sensor code/check errors) the sensor itself is suspect — replace the DD encoder slave sensor.
7. 7If the alarm returns after these checks, record the alarm number, full code and object and contact Okuma service.