System Parameters; Gravity Beta; Gamma Rotation - ABB IRB 1660 Product Manual

System parameters

Gravity Beta

If the robot is mounted upside down or on a wall (rotated around the y-axis), then
the robot base frame and the system parameter Gravity Beta must be redefined.
Gravity Beta should then be π (+3.141593) if the robot is mounted upside down
(suspended), or ±π/2 (±1.570796) if mounted on a wall.
The Gravity Beta is a positive rotation direction around the y-axis in the base
coordinate system. The value is set in radians.
Gravity Alpha
If the robot is mounted on a wall (rotated around the x-axis), then the robot base
frame and the system parameter Gravity Alpha must be redefined. The value of
Gravity Alpha should then be ±π/2 (±1.570796).
The Gravity Alpha is a positive rotation direction around the x-axis in the base
coordinate system. The value is set in radians.

Gamma Rotation

Gamma Rotation defines the orientation of the robot foot on the travel carriage
(track motion).
Product manual - IRB 1600/1660
3HAC026660-001 Revision: W
2.3.5 Setting the system parameters for a suspended or tilted robot
Note
The mounting angle must be configured correctly in the system parameters so
that the robot system can control the movements in the best possible way. An
incorrect definition of the mounting angle will result in:
• Overloading the mechanical structure.
• Lower path performance and path accuracy.
• Some functions will not work properly, for example Load Identification and
Collision detection.
Note
The system parameter Gravity Alpha is not supported for all robot types. It is not
supported for IRB 140, IRB 1410, IRB 1600ID, IRB 2400, IRB 4400, IRB 6400R,
IRB 6400 (except for IRB 6400 200/2.5 and IRB 6400 200/2.8), IRB 6600, IRB
6650, IRB 6650S and IRB 7600 (except for IRB 7600 325/3.1).
If the robot does not support Gravity Alpha, then use Gravity Beta along with the
recalibration of axis 1 to define the rotation of the robot around the x-axis.
Note
The parameter is supported for all robots on track when the system parameter
7 axes high performance motion is set, see Technical reference manual - System
parameters.
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2 Installation and commissioning
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