Patient Chair; Stand-Alone Installation Function; Dcfu Motor Control; Safety Switches (For The Locations Of The Safety Switches See Section 1.6, Safety Switches) - Sirona TENEO Service Manual

3 Important information
3.4

Patient chair

3.4.1

Stand-alone installation function

To operate the chair in stand-alone mode, the installation connector must be connected to the SDI connector of the assistant
element (on the chair). This connector closes off the CAN, simulates the safety switch in the assistant element and a bridge
lets the NSA board detect the connector.
If the patient chair does not find any NAJ board while booting, the four-way switch functions on the foot control like a four-
way foot switch. If the four-way foot switch and/or tilt component switch are present as options, these will function to support
the set-up phase and operate the patient chair without the dentist element/assistant element.
Once the NAJ board is detected, patient chair travel will be carried out only with "approval of the NAK board".
During movement of the patient chair communication between the NSA and NAK boards will be monitored. If the communi-
cation is disrupted, the patient chair travel will also be disrupted or not started at all.
3.4.2

DCFU motor control

In the DCFU board, the motor parameters and motor allocation/addressing are stored for the motor to be activated.
There are two types of motor: one large motor (lifting motor) and 2 small motors (for inclination and backrest).
After the replacement of a DCFU board, the NSA board determines via the "reference travel" function which DCFU board is
connected to which motor and will transmit the corresponding motor parameters.
During the reference travel, the motors are moved slowly to the end positions and the software of the NSA board stores those
positions.
During operation, whenever a reference point is crossed via a light barrier at X5, the calculated position is compared with the
actual position and corrected.
3.4.3

Safety switches (For the locations of the safety switches see Section 1.6, Safety switches)

Safety switch Backrest
SS_RL: S10 > L332 > NSA X14.B4 (A4 = SS-GND)
LED: NSA / V402 (Yellow) / SS code / Flashes 8x
Safety switch, footrest
SS_FA: S9 > L334 > NSA X14.B3 (A3 = SS_GND)
LED: NSA / V402 (Yellow) / SS code / Flashes 7x
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61 94 448 D 3509
D 3509.076.01.01.02 07.2008