Setting Up The Pneumatic Counterbalance; Figure 2-4: Counterbalance Pressure Vs. External Payload - Aerotech ANT130LZ-035 Hardware Manual

Mechanical Specifications and Installation

2.3.1. Setting up the Pneumatic Counterbalance

W A R N I N G : Failure to adjust the counterbalance per the following instructions could result in
bodily injury as well as stage and payload damage.
W A R N I N G : Sudden loss of pressure to the pneumatic counterbalance will cause the
carriage to drop rapidly. This could result in bodily injury as well as stage and payload damage.
By default, the ANT130LZ pneumatic counterbalance is 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 cylinder, either adding
or subtracting payload, necessitates an adjustment to the counterbalance pressure supplied to the
pneumatic cylinder.
A standard ANT130LZ stage has one counterbalance cylinder with a piston area of =4.53x10
moving mass of a standard ANT130LZ carriage assembly is 1.3 kg (2.9 lb) for 35 mm travel and 1.5 kg (3.3
lb) for 60 mm travel. 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:
16
Figure 2-4.
Counterbalance Pressure vs. External Payload
Chapter 2
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m , and the