To estimate the approximate input air pressure for your specific application perform the following steps:

Purely Lateral Overloads

Step1:

Determine the total weight in lbs. of your end of arm tooling. This will give you your mass at the end of the tooling. Let this = M.

M= [Weight of tooling + part (lbs)] ÷ 32

Step 2:

Determine the maximum acceleration in ft/sec2 under full payload for your application at the end if the robot arm Let this = A.

Step 3:

Use the following formula to determine your known expected force in lbs: Force (Fy) = M x A

Step 4:

Use your Force (Fy) in the following equation to determine P in psi, your ideal input pressure. Note: D = Distance from OPD plate to Cg (center of gravity) in inches (see below at right).

Model

OPD-MS-1A

P=Fy [(D) x (.581) + .389]

OPD-MS-2HD

P=Fy [(D) x (.172) + .166]

OPD-MS-3

P=Fy [(D) x (.019) + .05]

Purely Axial or Torsional Overloads

To approximate the operational input air pressure (P) for pure Z axis axial overloads, or purely torsional overloads about the Z axis, determine your maximum torque (Mz) in in-lbs. or axial force (Fz) lbs. and apply to the appropriate formula listed below:

Model	Pure Axial Overload	Pure Torsional Overload
OPD-MS-1A	P = Fz (.389)	P = Mz (.512)
OPD-MS-2HD	P = Fz (.166)	P = Mz (.247)
OPD-MS-3	P = Fz (0.05)	P = Mz (.024)

Note: Input air pressure settings were determined under laboratory conditions. Your performance may vary. The input air pressure may be varied in process to achieve the most sensitive overload protection without sacrificing high payload capacities.

Electrical Interface: The OPD Interface Module can be supplied for use on both 12 and 24 VDC systems. Module outputs are current sinking, sourcing, and isolated relay contacts. The standard output is a momentary off pulse typically interfaced with the systems emergency stop circuit. A continuous off signal can be provided by including "EL2" in the order code. For use with the OPD-MS-3, a larger valve is incorporated, the "PN1" should be added to the order code.