The Calibration Sequence can be started by triggering the safety event doCalibrating. This can be done by pressing the red button until this lights up. Press and hold the red button for 2 seconds, this will trigger the Safety Event doCalibrating. When finished with calibrating, press the red button once again. Press the green button to get back in normal operation mode.

Upper limit calculation shown below	Upper limit calculation detail

L = 17.5
B = 15
s = 4

The upper limit can be calculated as follows:

(1) tan(β) = sin(β)/cos(β) = (B-y)/L
(2) cos(β) = s/y

Substitute (2) into (1) to get:

(3) L*sin(β)-B*cos(β)=-s

Using following trigonometric formulas in (3):

(4) t = tan(β/2)
(5) sin(β) = 2*tan(β/2)/(1+tan^2(β/2)
(6) sin(β) = (1-tan^2(β/2)/(1+tan^2(β/2)

Leads to:

(7) (s+B)*t^2 + 2*L*t + (s-B) = 0

Solutions are:
t1 = 0.2736 → β = 30.6°
t2 = -2.1157 (neg. solution)

Hence, the maximum angle the axis can turn is 90° + β ≅ 120°.

Lower limit of the Axis Motor measured on the Delta robot, γ is about 5°.