103
Set the zero displacement point
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Set the zero displacement point
Setting the zero displacement point sets the transducer value to zero. This identifies the
current position as the starting point from which total crosshead displacement is
measured during a test. This effectively balances the displacement transducer.
“Zero displacement” is also known as “Reset the gauge length” or “Balance displace-
ment”.
1. Use the jog controls to move the crosshead to its starting position for the test.
2. Press the
ZERO DISPLACEMENT button on the handset. The button illumination
changes from white to green.
Crosshead limit stops
Crush hazard - you must set the crosshead travel limits as protection against
unexpected crosshead movement.
Although Bluehill lets you set limits of travel in the software, you must set the
crosshead travel limits as well. These hardware limits provide an absolute limit of
travel that operates independently of the software.
Set the crosshead limits stops after you have established the crosshead starting
position, but before you start a test.
The crosshead limit stops are two adjustable blocks mounted on the limit switch rod,
which is located inside the column of the machine, as shown in Figure 20 on
page 104. Limit stops (1 and 2) have thumbscrews that you tighten and release by
hand, and you can move them to any position on the limit rod. Position these stops just
beyond the test parameters to prevent crosshead over-travel. When the crosshead
reaches the maximum pre-set travel, the limit switch actuator (3) contacts one of these
stops. Contact between the limit actuator and the limit stop moves the limit switch rod
(4) and activates the limit switches. This stops crosshead motion.
There is an additional, second level of crosshead limit stop that is activated if the first
level switch malfunctions. Activating a second-level limit switch disables the drive
system so you cannot move the crosshead. The second level limits are internal to the
machine. They are calculated relative to the first level limits and cannot be
independently set.
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