MTS Series 248 Actuators - Manual (Page 35)

Series 248 Actuator Product Information Operation 35
Operation
This section describes how to operate the Series 248 Actuators using the static
support assembly.
Contents About the Static Support Assembly 36
How to Precharge the Static Support 37
How to Relieve Nitrogen Pressure from the Static Support 38
Calculate Static Support Precharge 38
How to Precharge the Static Support 39
Exceeding the maximum attached mass can cause unpredictable actuator
movement.
Unexpected actuator movement can result in injury to personnel or damage
to equipment.
Ensure that the maximum attached mass listed on the actuator ID tag is not
exceeded.
Operating
considerations
Piston rod banding can occur if the actuator is operated for a long period of time
at a moderate to high frequency, with short stroke displacement, and loads of
25% or more of the actuator capacity. Piston rod banding is the aggravated
erosion of the piston rod chrome plating in a band slightly wider than the width
of the seal encircling the circumference of the piston rod.
If the actuator is being used for moderate to high frequency, small displacement
testing, the starting position of the actuator piston rod should be changed
approximately every one million cycles. This will extend the life of the piston rod
and minimize the possibility of banding. If the system configuration allows it, the
piston rod starting position can be changed by using the displacement transducer
conditioner zero control and repositioning the load frame crosshead or fixture.
WARNING