631 Chair Tilt up / down Function Troubleshooting

631 Tilt Up / Down Function

This illustration shows only the components that affect the Tilt up / down function.

Power to Foot / Hand Control

115 VAC is supplied thru the two primary fuses F1 and F2 on the Power Supply PC Board.

The Power Toroid reduces the line voltage to 25 VAC.

The Power Supply PC Board reduces the 25 VAC and supplies 12 VDC to the foot / hand control.

Tilt Up Operation

When the Tilt Up function is activated, the foot / hand control sends a command to the Machine Control PC Board. The Machine Control PC Board relays the command to the Power Supply PC Board.

+ 24 VDC is supplied thru fuse F3 and - 24 VDC is supplied thru fuse F4 on the Power Supply PC Board to the Motor Control Hub PC Board.

The Motor Control Hub PC Board supplies a commutation sequence to the tilt actuator DC motor. F2 fuse on the Motor Control Hub PC Board protects the tilt actuator motor.

The actuator motor runs and raises the tilt section.

Actuator motor runs until:

1.Foot / Hand control button is released.

2.Tilt Up limit switch is tripped.

3.Active Sensing Technology® activated.

4.Foot Smart Sensor switch(es) activated.

5.Seat Smart Sensor switch(es) activated.

6.Stop button is pressed.

7.Overcurrent protection tripped.

8.Overtravel limit switch is tripped.

Tilt Down Operation

When the Tilt Down function is activated, the foot / hand control sends a command to the Machine Control PC Board. The Machine Control PC Board relays the command to the Power Supply PC Board.