STACIS
2100 Piezoelectric Isolation System - Installation & Operation Manual
P/N 96-28765-01
Page 15 of 43
If using wooden blocks,
•
place a bottle jack between two isolators, centered under one end of the platform,
•
raise the platform slightly, just enough to remove the spacer blocks,
•
then slowly lower the jack in a very controlled manner until this end of the payload is resting on the
nearest isolators.
•
Repeat for the other end.
The 5mm gap prevents excessive wedge loads from being applied to the isolators.
6)
Relieve any side-load on the Isolators by slightly raising the payload/plate over each Isolator with a
hydraulic jack thus allowing the Isolator to center itself and then slowly lower the plate on the Isolator.
7)
Confirm that the shipping latches on either side of the isolators (quantity 2 per isolator) have been
disengaged.
3.9
Initial Power Up and Load Adjustment
For four (4) STACIS
isolator systems,
the loading of the isolators must be adjusted using the internal
wedgemounts [after the installation of the payload] to achieve a distribution within the nominal load range
for all isolators To aid with the load redistribution, each isolator has an electronic displacement sensor
that measures the deflection of the STACIS’ internal high-frequency passive mount. The output of the
sensor can be displayed on the digital controller’s LCD. The sensor readings relate to the load exerted
on the isolators according to Table 4 below.
The isolators are equipped with a built-in wedgemount. The wedgemounts provide a
mean to redistribute the loading between the isolators.
They are not, however,
intended to be used to level the payload
. The stroke of the wedgemounts is very
limited.
The wedgemounts may be used on rare occasions for
very small
changes to the
payload’s level; however, care must be used to keep the isolator loading adequately
distributed. Adjustments to the payload’s level should be done with shims placed
between the isolators and the supported payload. The use of the wedgemounts for load
distribution is described below.
The high-frequency passive mount in STACIS
will cause the isolator height to creep
downward over time. The initial loading will deflect the isolators by up to 0.125” (4 mm).
Within the first week, the isolators may creep down an additional 0.04” to 0.12” (1-3 mm)
depending on the load. The system can be operated during this time; however, the level
of the system may change.
•
Use care to avoid shocking and/or overloading the Isolators. The Isolators can
be damaged if exposed to a load or force (load plus shock) greater than 6000 lbs
(2727 kg).
•
When moving or replacing an isolator, lifting one corner of the payload will
transfer up to 50% of the total weight to the diagonally opposite isolator,
potentially damaging its piezo ceramic stacks. Therefore, always locate the jack
midway between the Isolators on one side rather than just one corner, especially
if the total weight exceeds 10,000 lbs. (4545 kg).
