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P/N: 064577 Rev. 01, 12/09/19
PRINCIPLES OF OPERATION
Operation
The Spirit 1700 SII Dental Chair is operated by hydraulic com-
ponents. The chair backrest and truss are actuated by hydraulic
cylinders. Hydraulic flow is provided by a 115V pump (or 230V
on international product). Hydraulic flow is controlled by the
hydraulic control valve directing the hydraulic fluid from the
pump into the cylinders for movement. The Hydraulic Control
Valve can be adjusted to regulate hydraulic flow, reducing the
chair’s speed.
Control Devices
Control of the chair is possible with a multifunction foot switch
and backrest or unit-mounted touchpad. Both options allow
manual positioning of the chair and accessing of auto-positions.
the control system uses low-voltage membrane switches.
Automatic Positioning And Soft Limits
The Spirit 1700 SII Dental Chair has automatic position
programming, meaning it is capable of storing two automatic
positions. (See page 21 for programming procedures.) User
programs are saved and retrieved by using potentiometers
(variable resistors). The chair has a potentiometer on the
backrest and truss sections. The potentiometer tracks the
chair’s movement on geared assemblies that reference off
the chair’s backrest and truss cylinders.
The dental chair extremes of travel are controlled using the
same potentiometers described above. The chair is progra-
mmed at the factory to a series of predetermined soft limits.
Refer to page 20 for factory soft limit settings.
Base Safety Plate
The base safety plate, when activated, will stop the downward movement of the chair base section. This safety feature will prevent any
damage if an object should obstruct the chair’s downward movement.
Note: When a potentiometer or other related component is
replaced it will be necessary to reset the chair’s soft limits.
Location of
Safety Plate
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