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7.2 Safety switches
Care should be taken when driving the patient chair from one position to
another. Obstructions in the patient chair’s line of movement activate safety
switches that stop the motorised movements. The safety switches and their
functions are described below.
1. Backrest
An obstruction between the backrest and the floor when driving down the
chair and/or the backrest stops downwards chair and backrest
movements. Remove the obstruction to resume normal operation.
2. Chair-mounted left/right suction arm, joint
The suction arm is in the upmost position and prevents the chair and
backrest from being driven downward. They can be driven normally
when the suction arm has been moved downward.
3. Chair-mounted left/right suction arm, arm underside
An obstruction under the suction arm prevents the chair and backrest
from being driven downward. Remove the obstruction to resume normal
operation.
4. Chair bottom and lift adapter
An obstruction between the chair and the floor stops downwards chair
and backrest movements. Remove the obstruction to resume normal
operation.
5. Legrest
The position of the legrest is identified as ‘locked’ or ‘unlocked’ (= hangs
freely). Based on this information, the chair can be driven lower when it
is locked.
6. Adjustable legrest (all lengths)
An obstruction between the legrest and the floor stops downward chair
movements. Remove the obstruction to resume normal operation.
7. Bowl
The bowl is above the patient chair and stops upward chair movements.
Move the bowl into home position to resume normal operation.
8. Cuspidor door
The patient chair up/down movement is inhibited when the cuspidor door
is open. Also, the operation of instruments is inhibited. Close the door to
resume normal operation.
9. Side delivery; delivery arm joint (down)
The delivery arm is below its mechanical limit and downward backrest
movements are stopped. After stopping, the backrest can be driven
upward.
10. Side delivery; delivery arm joint (up)
The delivery arm is above its mechanical limit and upward backrest
movements are stopped. After stopping, the backrest can be driven
downward.
7 For your safety
14 Planmeca Compact i User's manual