230 Universal Procedures Chair Base Up / Down Function Troubleshooting
This illustration shows only the components that affect the Base Up / Down function.
On models w/ rotational base, the Main System Transformer connections are supplied thru the Rotational Base PC Board (not shown).
•Only the wires that affect the Base Function are shown.
•If Power Light is On, proper voltage is present at PC Board.
•If Power Light is off, refer to Power To The Chair for troubleshooting.
•Black and white wires supply 48-54 VAC to power circuitry for the Base and Back actuators.
Is There Power To The Chair?
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 / Hand Controls
Circuitry on the PC board supplies 8-10 VAC to the hand / foot control connection ports.
Base Up Operation
When the Base Up function is activated, current flows thru the hand / foot control, back to the PC board. Circuitry on the PC Board supplies approximately 48 VDC to the base actuator motor.
The actuator motor runs and raises the chair.
The PC board continuously monitors the Base Up limit switch and the Base position sensor*.
If the Base Up limit switch is tripped (open), the Base Up function will not operate.
If the Base position sensor* detects that the chair has reached its upper limit, the Base Up function will not operate.
Actuator Motor runs until
1.Hand / foot control button is released.
2.Base Up limit switch is tripped.
3.Emergency Stop button* is pressed.
4.Position Sensor* malfunction.
5.Overcurrent protection tripped.
6.Software time-out limit is reached, approximately 25 seconds.
* Midmark models only. This feature is not available on Ritter models.
Base Down Operation
When the Base Down function is activated, current flows thru the hand / foot control, back to the PC board. Circuitry on the PC Board supplies approximately 40 VDC to the base actuator motor.
The actuator motor runs and lowers the chair.
The PC board continuously monitors the Base Down limit switch and the Base position sensor.
If the Base Down limit switch is tripped (open), the Base Down function will not operate.
If the Base position sensor* detects that the chair is in a potential crash position, or that the base has reached its lower limit, the Base Down function will not operate.
Actuator Motor runs until
1.Hand / foot control button is released.
2.Base Down limit switch is tripped.
3.Emergency Stop button* is pressed.
4.Crash Avoidance System* activated.
5.Position Sensor* malfunction.
6.Overcurrent protection tripped.
7.Software time-out limit is reached, approximately 25 seconds.
* Midmark models only. This feature is not available on Ritter models.
No Base Up or Base Down
1.Loose / Damaged Wire Connections - Base Actuator, Base Up/Down Limit Switches, hand/foot control ports, black and white wires between main system transformer and PC board.
2.Hand / Foot Control. Refer to: Hand and Foot Controls
3.Base Actuator. Refer to: Base Actuator
4.Main PC Board. Refer to: Main PC Board
No Base Up, Base Down OK
1.Loose / Damaged Wire Connections - Hand/Foot Control and Base Up Limit Switch.
2.Base Up Limit Switch Refer to: Limit Switches
3.Hand / Foot Control Refer to: Hand and Foot Controls
4.Base Actuator Refer to: Base Actuator
5.Main PC Board Refer to: Main PC Board
No Base Down, Base Up Ok, All other chair functions Ok
1.Loose Wire Connections - Hand/Foot Control and Base Down Limit Switch
2.Base Down Limit Switch Refer to: Limit Switches
3.Hand / Foot Control Refer to: Hand and Foot Controls
4.Base Actuator Refer to: Base Actuator
5.Main PC Board Refer to: Main PC Board
Base drifts down
Base Actuator Refer to: Base Actuator
Noisy operation, Grinding, squeaking, etc
1.Clean / lubricate gas spring pivot joints Recommended lubricant: Lithium grease Refer to: Gas Springs
2.Clean / lubricate base actuator threads. Recommended lubricant: Lithium grease
3.Wipe guide bars with a clean, dry cloth. Never lubricate base slides / scissor mechanism. Refer to: Base Shroud Removal
4.Base Actuator Refer to: Base Actuator
Moves slowly and/or Will not lift patient
1.Did patient exceed 450 lb. weight limit? Inform staff that max. patient weight is 450 lbs. Refer to: Specifications
2.Low voltage to chair.
|
Required voltage: |
|
|---|---|
|
115 VAC setting |
115 +10% VAC |
|
230 VAC setting |
230 +10% VAC |
3.Gas Springs Refer to: Gas Springs
4.Base Actuator Refer to: Base Actuator
