Datum mode

When the battery is first inserted or replaced, the MIH enters a datum mode routine which must be successfully completed prior to use.  The A and B-axis position detectors within the head require datuming to a zero position before the LCD will display the correct A and B-axis positions.  Datuming the head will also be required if a head datum error occurs during use.

Step 1

On entry into datum mode the LCD shows a datum error.  Unlock the head to reset datum.

step_1_datum_mode_

 

Step 2

Rotate the A and B-axes to their zero positions by aligning the zero position markers on both axes.

step_2_datum_mode 

Step 3

Lock the head in this position and press the M+ and M- buttons simultaneously to reset datum.

step_3_datum_mode

Step 4

The display will now change to show A and B-axis data at A0.0, B0.0.  Datum is now set and the A and B-axis displays will show positional data when the head is locked and unlocked.

step_4_datum_mode

Step 5

Confirm that datum is correctly set by rotating each axis to its extreme positions and check that the position data on the LCD is correct.

A-axis 0° to +105° plus overtravel
B-axis ±180° plus overtravel.