Setting Up The Pneumatic Counterbalance; Figure 2-4: Counterbalance Pressure Vs. External Payload - Aerotech ANT130LZS Series Hardware Manual

ANT130LZS Hardware Manual

2.2.1. Setting up the Pneumatic Counterbalance

WARNING: General Hazard Warning!
If you do not adjust counterbalance according to the instructions that follow, you can
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possibly injure yourself or cause damage the equipment.
If the pneumatic counterbalance suddenly loses pressure, the carriage will quickly
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drop. This could cause an injury or damage the equipment.
By default, the ANT130LZS pneumatic counterbalances are factory set to operate in the as-shipped
condition. For stages that are shipped unloaded, the counterbalance is set for the mass of the
carriage only. For stages that ship with payloads or other axes attached, the counterbalance is set for
the mass of the carriage plus the additional mass. Any adjustment to the mass that is carried by the
counterbalance cylinders, either adding or subtracting payload, necessitates an adjustment to the
counterbalance pressure supplied to the pneumatic cylinders.
Standard ANT130LZS stages have two counterbalance cylinders with a combined piston area of
-4 2
3.96x10 m , and the moving mass of a standard ANT130LZS carriage assembly is 1.4 kg (3.1 lb). An
estimate of the counterbalance pressure required to support additional load is given by the
following:
where
Pc = Required counterbalance pressure in MPa (maximum 0.6 MPa allowed)
mp = mass of external payload in kg.
This relationship is shown graphically in
Figure 2-4: Counterbalance Pressure vs. External Payload
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2.2.1. Setting up the Pneumatic Counterbalance
Pc = ((mp + 1.4) * 9.81) / (3.96x10
Figure 2-4.
-4 ) / 1x10 6 {MPa}
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