646 Chair Tilt Up / Down Function Troubleshooting
The illustrations show only the components and wiring that affect the Tilt Up / Down function.
Serial Number Range: V2200 thru V1977127
Refer to: Crash Avoidance System for a detailed description of "crash position", and the functions that are disabled.
Power Indicator Light
When voltage is applied to the PC board, the power light is illuminated.
Is there power to the table?
When voltage is present at the PC board, the power light is illuminated. Refer to: Power to the Chair for description of current flow to the PC board.
Power to Foot Control / Touch Pads
Circuitry on the PC board supplies 14 VAC to the foot control and touch pads.
Tilt Up Operation
When the Tilt Up function is activated, current flows thru the foot control / touch pad back to the main PC board. Circuitry on the main PC board supplies approximately 48 VDC to the tilt actuator motor.
The actuator motor runs and reclines the seat section.
The main PC board continuously monitors the tilt sensor PC board.
When the tilt sensor PC board detects that the seat section has reached its upper limit, the current flow to the tilt actuator is interrupted, and movement stops. The sensor PC board performs like a normally closed limit switch.
Actuator motor runs until:
1.Foot control / touch pad button is released.
2.Tilt sensor PC board detects upper limit.
3.Emergency Stop button is pressed.
4.Overcurrent protection tripped
5.Software timeout is reached (30 seconds).
Tilt Down Operation
When the Tilt Down function is activated, current flows thru the foot control / touch pad back to the main PC board. Circuitry on the main PC board supplies approximately 48 VDC to the tilt actuator motor.
The actuator motor runs and lowers the seat section to a flat position.
The main PC board continuously monitors the tilt down limit switch and the foot extension switch.
If either the tilt down limit switch, or the foot extension switch is tripped (open), current flow to the tilt actuator is interrupted, and movement stops.
Actuator motor runs until:
1.Foot control / touch pad button is released.
2.Tilt Down limit switch is tripped.
3.Foot extension switch is tripped.
4.Emergency Stop button is pressed.
5.Overcurrent protection tripped
6.Software timeout is reached (30 seconds).
Serial Number Range: V1977128 thru Present
Refer to: Crash Avoidance System for a detailed description of "crash position", and the functions that are disabled.
Is there power to the table?
When voltage is present at the Power / Quick Chair PC board the power light is illuminated. Refer to: Power to the Chair for description of current flow to the PC board.
Power to Foot Control / Touch Pads
Circuitry on the Motor Control PC board supplies 3.3 VDC to the foot control and touch pads.
Tilt Up Operation
When the Tilt Up function is activated, current flows thru the foot control / touch pad back to the Motor Control PC board. Circuitry on the Motor Control PC board supplies approximately 48 VDC to the tilt actuator motor.
The actuator motor runs and reclines the seat section.
The Motor Control PC board continuously monitors the Tilt Sensor PC board.
When the Tilt Sensor PC board detects that the seat section has reached its upper limit, the current flow to the tilt actuator is interrupted, and movement stops. The Tilt Sensor PC board performs like a normally closed limit switch.
Actuator motor runs until:
1.Foot control / touch pad button is released.
2.Tilt Sensor PC board detects upper limit.
3.Emergency Stop button is pressed.
4.Overcurrent protection tripped.
5.Software timeout is reached (30 seconds).
Tilt Down Operation
When the Tilt Down function is activated, current flows thru the foot control / touch pad back to the Motor Control PC board. Circuitry on the Motor Control PC board supplies approximately 48 VDC to the tilt actuator motor.
The actuator motor runs and lowers the seat section to a flat position.
The Motor Control PC board continuously monitors the tilt down limit switch and the foot extension switch.
If either the tilt down limit switch, or the foot extension switch is tripped (open), current flow to the tilt actuator is interrupted, and movement stops.
Actuator motor runs until:
1.Foot control / touch pad button is released.
2.Tilt Down limit switch is tripped.
3.Foot extension switch is tripped.
4.Emergency Stop button is pressed.
5.Overcurrent protection tripped.
6.Software timeout is reached (30 seconds).
